objective lense?

I broke the objective lense on my Kalart Victor overhead projector.  Looks like it is a 64mm, solid lense.  Anyone have one or know where I might find one?    thanks   tom

Question by Hubiewan 9 years ago  |  last reply 9 years ago


Film to digital lenses? Answered

 So I'm looking to buy the Canon EOS Rebel XS 10.1 mp. I have an old AE-1 and several lenses. Do the lenses work with the new line of Rebels?

Question by spydog4 9 years ago  |  last reply 9 years ago


I got two 40x and one 42x projection t.v. lenses any ideas for a good craft out of them?

They came out a 60" big screen television and they were the only things I could salvage out of it. I'm wondering if anyone has any cool ideas for them.

Question by Neg8tyv 9 years ago  |  last reply 9 years ago


Light field camera

Came across this interesting camera that fuses the images from multiple lenses. https://light.co/camera  I suppose it is a "light field camera" as described here https://en.wikipedia.org/wiki/Light-field_camera Any suggestions on possible solutions, or links to similar projects? Prefferable that uses lenses from disposed of smartphones. 

Topic by mskogly 3 years ago  |  last reply 3 years ago


Eyeclops Bionic Eye Toy. Anyone know if you could combine this with a camera somehow?

I played around with this but already bored with it. Wondering if it could be modified.

Question by short_circuit_sam 8 years ago  |  last reply 8 years ago


Fixing green laser lense

Last year I bought a 5mw eBay laser (green 532nm wavelength) and it had an adjustable focus. I scratched the lens and it never focus right so I took the lens off. Now I am interested in fixing it again and I don't know how to get/make/buy/obtain a new lens for the laser. It always said it was 5mw but I think it was more powerful because it could burn through bags, light leaves on fire, pop balloons, light matches at 6 inches. This is what the laser looked like. http://www.ebay.com/itm/High-Power-Military-Adjustable-Focus-Green-Laser-Pointer-Pen-5mw-Silver-/281269467436?pt=US_Laser_Pointers&hash;=item417cf7792c

Question by waterrocketexpert 5 years ago  |  last reply 5 years ago


Mounting Lenses On Your Microscope

I found a broken cell phone with it’s camera and wondered if the lens could be used as a microscope objective. Image A shows the lens and it’s mounting with the CCD. The back of the lens is shown. The lens is about 4 to 5 mm in diameter. The starters from florescent lights make good lens holders. Image B shows a starter along with my modifications to hold the cell camera lens. The starter tube has 4 slits along the length so it can be compressed to fit the turret of the microscope. Image C shows it mounted on the turret. Image D shows the resulting view of a feather. It’s quite bad. Image E shows, for comparison, the view through an ordinary 20x objective (.40 NA). Here are some more lenses that I tried: Lens from a discarded flatbed scanner..... Very good! Lens from a 8mm movie camera...... Fair. Lens from the laser pickup of a discarded CD player..... Almost worthless. To take pictures through the microscope, I used eyepiece projection with a wide angle eyepiece. The lens on the camera was set to wide angle and maximum aperture, with a remote used to trigger the shutter. The camera’s LCD was used to focus and adjust the image. The camera’s autofocus handles the rest. For even illumination, be sure to center the objective lens over the substage condenser.

Topic by ShutterBugger 8 years ago  |  last reply 8 years ago


Could I fit a Canon 70-210 Zoom lens for a film onto a Canon XSi?

I still shoot film, and I use a Canon FT-b, mainly with my 70-210 Zoom Lens. I'm currently looking to upgrade to a Canon XSi, and I was wondering if there was a converter that any one knows/thinks would work.  Thank you for your help!

Question by Kumiii 8 years ago  |  last reply 8 years ago


How do I enlarge an image that's been projected onto a screen? Answered

Hey, I made this device that shines light through an LCD screen to project the image onto a window, which then reflects back to me, forming a sort of heads-up display. The LCD screen is about the size of a credit card, and I can't move it any further than ~40cm from the window. Another restriction is, any lens I use can't make the device any more than another 5cm thicker. (that includes distance between the lens and the screen) Is it possible to make the image appear any larger using any lenses? I've tried those plastic magnifying sheets and a lens from a projector tv, but they don't seem to make much difference. Thanks

Question by .Unknown. 5 years ago  |  last reply 5 years ago


How to make an old opaque projector focus at a closer distance? ?

I recently pulled a fully functional Seerite 10x10 opaque projector from a dumpster, but it only focuses at ~ 15-18 feet from the surface that I am projecting on; any way to shorten the focal distance?

Question by A.J.B. 6 years ago  |  last reply 5 years ago


WANTED!! large frensal lenses, parabolic lenses(concave), and projection TV's

I need some parabolic lenses, frensal lenses, and projection TV's to make a death ray from thanks

Topic by ostomesto 8 years ago  |  last reply 6 years ago


What to do with all these extra lenses? Answered

I bought a pack of lenses online from http://www.dealextreme.com/details.dx/sku.15774 for an instructable.... but all i needed was the 8mm one.... so now I have all these mini lenses and I want to do something with them! I was thinking maybe a mini solar deathray or something? any ideas?

Question by davej6694 8 years ago  |  last reply 8 years ago


strange fluid inside a rear projection tv i was pulling apart? Answered

So i was disassembling a toshiba rear projection for the fresnel lense, and figured i'd pull the rest of it apart and see what parts i could salvage, i got to the gun assembly (i think its called that) and was pulling one of the guns to bits to salvage the lens mount and discovered there was some sort of liquid between the gun and the lenses, it smelt strongly like alcohol and burnt when i held a flame to it long enough, i got some on my hands and my hands started getting a burning sensation so i washed it off and stored it in an icecream container can anyone tell me what the liquid is? why is it inside the tv/projection guns? 

Question by mammasboy 4 years ago  |  last reply 1 year ago


Lasers vs LEDs in the deep ultra violet spectrum, and focusing?

I am currently trying to research this topic as I am looking into building a stereolithograph 3D printer. I have been searching for some time now with not a whole lot of answers. This is not my area of expertise so I could use some input. I have found lasers in the range of 256nm wavelength but it is going to cost me an arm and a leg. Even at the price range the UV lasers are only outputting at most 1W of power. I have read that UV curing resin is most reactive in the range of 265nm and that is why I have been searching for something in that ballpark. I have found some companies that manufacture LED in that wavelength but then the problem is going to be trying to focus the light down to a fine enough point. I am trying to design a 3D printer that is in the high resolution range. So, my true question is. Does UV curing resin react best with the 265nm vs the 400nm range as I could just a blu-ray laser. If it is better at the 265nm range, could I possibly be able to focus enough light from a couple of 3W leds down to a small enough point to cure the resin where I want it to be. The other idea is taking a UV laser in the 400nm range and focusing the beam down to get me fine but quick set up time in the resin. Or possibly multiple Lasers

Question by ColtanA 4 years ago  |  last reply 4 years ago


How does a telescope work different from a camera lense?

How does a telescope work different from a camera lense? I'm specifically wondering about magnification. With a camera lense, a longer lense means higher magnification so to get really high magnification it needs a really long lense. With a telescope they just change the eyepiece to get higher magnification and don't change the length of the telescope.. How is it telescopes can change magnification like that and camera lenses can't?--tradingmic.com

Topic by Joella Erspamer 7 years ago


How to make a laser pointer out of a dvd laser diode? Answered

I have about 8 laser diodes and many optical stuff from the laser head of the dvd. Also I have some burnt laser poineters. I don't know how to focus the ray.

Question by theVader75 8 years ago  |  last reply 8 years ago


best method to repair dull plastic headlight lenses?

Question by arkybid 7 years ago  |  last reply 7 years ago


What kind of lense do I need to see infrared with my eyes? Answered

What kind of lense do I need to see infrared with my eyes? I want to take pictures and see inrared with my eyes through a lense or filter of some sort. What kind of filter do you recomend? Can I see IR with a IR filter? (def. of a filter: blocks certain wavelenghts of light). Thanks

Question by QuickTime 9 years ago  |  last reply 7 years ago


Olympus camera question? Answered

I have several Olympus lenses for my old SLR camera. If I buy an Olympus DSLR will the lenses fit it? (unless anyone can direct me to a way to fit the lenses to my Fuji finepix S5500

Question by rickharris 8 years ago  |  last reply 8 years ago


Microscope buying help?

I'm planning on buying a compound microscope and can't decide on some stuff either because  I'm a total n00b or I am a n00b. well, here they are: what eyepiece will i buy? 10 or 15x? will i buy the one with built in light or get the one with the mirror? will i get an iris style diaphragm or regular diaphragm (the one with holes) do you like pie or not? (I do) yeah, please answer in order, need answers before tuesday, 0200HRS UTC ok? thanks i'll tell you the results of what i bought after i buy it

Topic by beehard44 8 years ago  |  last reply 8 years ago


Is there any place to get custom-shaped prescription lenses?

I have a pair of goggles of the style featured in this instructable. The problem arises because I am nearsighted and need prescription lenses to see properly. Thus the question: Is there some website where I can give them the particulars of the lenses and have them make the lenses and cut them to fit in the goggles? FYI, they would just be 50mm circles.

Question by nruegs 9 years ago  |  last reply 3 years ago


Using lenses to create a beam of normal light??

If you had, say, light from a torch or whatever, directed it through a metal pipe or fiber optic to get it kind of directional, and then into some arrangement of lenses; what kind of maximum range could you expect before it completely lost focus? And would it still obey the inverse square law, or is that just for expanding spheres of light?

Topic by SolarFlower_org 10 years ago  |  last reply 10 years ago


Anybody got any idea what to do with the expired contact lenses solution?

I have many expired contact lenses solutions eating dusts in my room. what do you do with yours?

Question by ahburn 9 years ago  |  last reply 9 years ago


Hilarious: Altered-Perception Sports

I saw this video of a Japanese game show where players try to play a game of soccer with binoculars strapped to their heads: It made me think: what other kinds of games could you have, where your own perceptions were the challenge? Fisheye lenses over each eye? Periscopes? Let's hear some ideas; maybe we can come up with some cool, brand-new Instructable ideas.

Topic by nagutron 11 years ago  |  last reply 11 years ago


whats the difference betwene a slide projector lense and a magnifying glass?

I need to know pleasseee

Question by xadevox 9 years ago  |  last reply 9 years ago


How can I arrange lenses in a way that will help me focus on close objects?

I want to build night vision goggles, and I decided to connect a camera to a screen that would be mounted on sun glasses. The only problem is, that the screen is too close to my eye to focus on. Is there an arrangement of lenses that would solve my problem?

Question by yonch 6 years ago  |  last reply 6 years ago


Where can I find convex lenses with a focal length of Answered

Hello, I'm searching for a convex lens for focussing the beam of my laser. The focal length should be smaller than 1cm. I've searched in cd/dvd readers/burners but those lenses are never good enough because either the focal length or the size of the lens isn't good. Thanks in advance, Electorials

Question by DELETED_Electorials 7 years ago  |  last reply 6 years ago


Could a prism and lenses be used to make a stereoscopic video with only one camera?

I want to make my own 3D video and I only have one camera. could I make a camera attachment in a "T" shape and use a prism to split the camera's focal point to the left and right then have each direction hit a 45 degree mirror to turn the focus back to the front of the camera and set a filter on each side of attachment that will correspond to filters on lenses of 3D glasses, and have this make a stereoscopic video with one camera? Could anybody who has experience with prisms and lenses verify if this would work before I start building a prototype...

Question by SWV1787 10 years ago  |  last reply 3 years ago


Tilt shift lens for point and shoot (with filter mount)? Answered

Hey i was just wondering if you could make some sort of tilt shift lens for a higher end point and shoot (like panasonic fz100) that has a 52mm filter mount, or do you have to have a DSLR with interchangeable lenses. Thanks in advance :)

Question by astroboy907 8 years ago  |  last reply 8 years ago


Canon Powershot SD1100. The lense is stuck and won't retract. Any suggestions?

Hi most brilliant community- Unfortunately, I'm very accident prone and dropped my Canon Powershot SD1100. The lense will not retract. When I turn it on you can hear the motor whirring, but it's not taking the lens in. An error message pops up sayin "lense error, restart camera" which I've done. I have also googled this error have been to many sites that tell you to hit it, or push this button while pushing that button but I can't seem to get it to budge. I did open it up to take a look and the lense is, of course fully enclosed. Most replacement lenses are arount $80 w/o labor. I am convinced that this camera can be saved (without mucho dollars) Has anyone ever taken one apart and more importantly, mended a camera such as this? Can a klutzy but resourceful girl (me) fix this on my own? I have a second camera (same type) that i spilled a melted frosty all over and now it wont turn on. I'll leave that situation for another time! Thank you to anyone and everyone who has any suggestions!

Question by cameramenace 8 years ago  |  last reply 8 years ago


how to make a home made projector?

By using a  std convex lenses. 

Question by amit16121992 8 years ago  |  last reply 8 years ago


HAL 9000

I am Planning to build a HAL 9000 Panel for the outside of my room, but I am having a problem with the lense. I was wondering if anyone knows how they diffused the light so well, without blurring the lense. (In case you didn't know I am talking about the Movie Space Odyssey)

Topic by Jordo 10 years ago  |  last reply 7 years ago


how to make motor vehicle indicator lenses, the orange bit,

Can i use my origenal to make a mould, any suggestions, then i'll be back to ask, what do you mean, how do i do that, where can i get one of those from etc. etc. hehe thanks johnny

Question by johnnywgk 10 years ago  |  last reply 10 years ago


Where to find biconcave lens?

I want to make the google cardboard VR, but I cannot find biconcave lens. Is there any household thing that contains biconcave lenses with about 45 mm focal lengh and can the spectacle lenses be used for this project? Also buying online is not an option for me.

Question by Ahtasham Ahmad Mohtashim 3 years ago  |  last reply 3 years ago


Can anyone suggest a way to make an array of lenses (say 5mm dia - 100 x 100 pieces) on a flat sheet of acrylic? Answered

I have made a simple version - using an acrylic sheet, heating, then pushing down a perforated metal sheet on top to create the 'bumps' Can anyone think of another way?

Question by sParekh 10 years ago  |  last reply 8 years ago


Solar Energy

Hi, i would like to ask for opinion, i am building a solar system where my system start from using a fresnel lense to collect the sun and use it to heat up a boiler, the boiler transfer steam into my tesla turbine and the turbine will turn my generator to produce electricity. Do anyone have any idea of building an own boiler instead of using a pressure cooker that i had seen this idea in somewhere, And, is there any places can provide cheaper fresnel lense as the sun focusing tool?? i will need a cheaper price lense cause of shortage in my budget of my final year project... 

Topic by 000123000 8 years ago  |  last reply 8 years ago


digital camera? Answered

I have seen somewhere a cut down digital camera rehoused in a wooden box. the thought strikes me- I have several redundant Olympus lenses could I successfully take a point and shoot digital camera, remove the lens, mount the camera body in a box and add my Olympus lenses to the front to make an exchangeable lens digital camera? I realize I would need to get the lens to CCD distance right but that doesn't seem to be all that difficult - I can engineer an adjustable mount if necessary. it seems a pity to have all these lenses and nothing to do with them. Opinions guys?

Question by rickharris 7 years ago  |  last reply 7 years ago


making eyeglass frames

Hello, im in the process of making myself a pare of eyeglass frames. im stuck at figuring out how to get the groove into the inside of the frames for the lenses to fit in because the lenses are curved. and the frames are rectangular in shape. anyone have any experience in making glasses? can someone give me a tip? much appreciated. :-D

Topic by adamtj 11 years ago  |  last reply 11 years ago


Gravity water lenses: What's the best material for the water retainer? (cheap and easily available in the market) Answered

Hey all! I was looking to develop the water lens concept for a wider domestic use. Could you guys recommend some material that could be used for forming the base of the lens? I had thought of using Clear Mylar sheets. Thanks.

Question by SaumiJoshi 6 years ago  |  last reply 6 years ago


broken flexible communication flat plastik stuff soft circuit between camere lenses and it's cpu how 2 fix?

Is it fixable or where can I get only the kinda wiring track- soft circuit bettheen cpu of camera and it's lenses SEE ON PICTURES  email: astana.renaud@gmail.com     astan-art-fx

Question by this time use more propane 8 years ago  |  last reply 8 years ago


Polycarbonate cutting

So, I had an idea some time back, to inset a rectangle cutting of a lens off a pair of glasses, into an eye cup for your camera. Costco sell their lenses to minors for 20 dollars, if I could get them to sell me just lenses, would a glass cutter like they have at home depot (i think) be able to cut it down to a small rectangle? If not, how could I cut it?

Topic by Weissensteinburg 11 years ago  |  last reply 11 years ago


How to build a ray box to use for a set of refractions/reflections? Answered

I would like to make a 'solid' ray box (not out of cardboard!), preferably with more than one slot, and shine the rays from it to a set of mirrors, prisms, and all different kinds of reflective/refractive materials. The light would bounce off quite a few medias so I imagine it needs to be quite strong, but again, how strong? I know I need a fresnel lense in order to make the rays coming out of my ray box parallel but what is the rule, what distance does the lense need to be from the source of light, and does it depend on the size and strength of the light? Thank you very much!

Question by matisha23 7 years ago  |  last reply 7 years ago


How do you align an old big screen TV?

I have one of those old, 90's big screen TVs, but the lenses are out of alignment so it is literally painful on the eyes to watch at times. Anybody know (or have a link to) how to align the lenses? (It's not so important to me that I want to pay a pro to do it, but I haven't gotten rid of it yet in case it could be done). Thanks!

Question by victus_maestro 10 years ago  |  last reply 10 years ago


Can you suggest some good lenses for my Nikon D40? Answered

Hello all, After using my Nikon D40 with the kit lens for about two years now, I think I'm ready to buy some extra lenses for it.  I have two primary needs that I hope to satisfy with no more than two lenses, and hopefully just one. 1.  Macro photography.  For my work on Instructables I take a lot of macro shots, and I find the kit lens (or is it the camera?) difficult to use for this.  When the minimum focal length is 8 inches or more it's just really hard to get a good shot.  For this need I'd be happy with a manual focus lens since I'd be the only one using it.  But, I really need tighter macro shots than the kit lens - whether this lens can get physically closer or whether it needs to be telephoto I don't really care. 2.  Low Light.  My wife and I often find ourselves in situations where we'd like to take photos of people (and especially children!) in low light, without a flash.  Obviously, this leads to lots of blurring and other undesirable mistakes.  I think a nice, fast lens on the order of f/1.8 or f/1.4 would do the trick, and Nikon makes a nice AF-S model for less than $200.  The trouble is the lack of zoom - I think I could deal with it, but my wife uses the whole range of 18-55mm on the kit lens and would probably throw her hands up in despair if that ability were missing.  So what's the solution here? Thanks for any suggestions you folks can provide, especially when it comes to older lenses.  Apparently the D40 can mount old non-AI Nikon lenses which is good news I guess, because it opens up a whole world of used lenses.  Beyond that I must plead ignorance... EDIT:  I'm somewhat leaning towards the fast 35mm f/1.8 AF-S prime lens and an extension tube set for macro.  Still researching, though.... EDIT 2:  Still liking the looks of the 35mm prime, but now considering a Nikon 3T or 4T diopter macro filter, if I can find one... EDIT 3:  SOLUTION:  I ended up buying the 35mm f1.8 prime lens and a 10x achromatic macro filter (I didn't manage to find a Nikon filter, but I did find one that claimed to be a true achromat lens setup.  We'll see when it arrives!)

Question by jeff-o 9 years ago  |  last reply 9 years ago


digital soldering glasses... i need inSIGHT.

I have a idea, to create digital soldering glasses but don't have any inclinations on what direction to go or what mats. to use. I have entertained microscope lenses, ben franklin-esk, lenses (not digital),surveillance pens( not sure how to zoom them),phone cameras( no idea how they zoom either (not in a diy fasion)) a small screen to a hacked digital camera scope, I am a experienced circuit developer with limited understanding of optics. so here is the question if not "think tank" disclosure. if you were to make "zoom glasses" what you use and why.  other low tech to turn digital to be jewelry quality scopes. magnifying lenses for eyeglass repair, etc.     thanks for your time and consideration.

Topic by CD_tatro 4 years ago  |  last reply 4 years ago


What fun project can I do with around 300 Liconix high powered laser lenses Collimator ,optic lenses, Optic Filter..etc

Old Neighbor of mine was a Senior Laser Technician for Liconix about 10-15 years ago probably still works there. Anyhow he always would always be working on lasers Argon, Helium, Krypton, and his classic cars and overtime his family became sort of family to me. I would watch in awe as he worked trying to learn as much as possible. So I would help him work on his cars or Fix a PC for him here and there or take care of his son. I was only 13 at the time, but he was nice enough to give me a couple lasers for helping that his work was going to discard, some helium, Argon. I had to give the Argon back though because he sold his house and was moving to a better neighborhood. Plus it kept blowing the fuses in my parents'house from the power load. PGE was getting angry cause for some reason the street light sensors in my neighborhood were somehow getting burned out all the time *shrug* I don't know how and had to keep repairing them. Before he left he gave me some extra tubes for when my others eventually died. Most helium and tons of lenses of various sizes which are all tucked away in a box. In my dad's Garage of Death yeah he's a pack rat. But I found a couple of the lenses when I came to visit that I had sitting around the house and thought to myself time to dig the box out, so I'm slowly digging my way to it. Just don't know what fun project to do with all of it other than making a Laser Beam of doom or putting them on Sharks with fricken laser beams attached to their heads I also have a Fresnel lens from a 45 inch rear projection TV. Any Idea what fun project I should make with all of it ? I bet it would make one hell of a laser pointer for my Celestron GPS-GOTO C11 Telescope haha.Thanks for any idea's.

Question by Laser_PewPew 10 years ago  |  last reply 9 years ago


I need an instructable (goggles)

I want to make goggles like these but i need an idea of how to go about it

Topic by corey_caffeine 10 years ago  |  last reply 10 years ago


Telescope with 3 tubes

Hello all, I wish to make a telescope with a long (1 metre) cardboard tube I got with a potrait I bought a few days ago. I already have 3 smaller tubes - 2 from silver foil rolls (which are very thin in diameter - about an inch), and another from a soldering iron (which goes inside the big tube easily). Is it possible that I make a telescope using three tubes (one sliding inside the other) and three lenses? If yes, how and what lenses I need to use? Regards

Topic by rseni 7 years ago


Re-purpose slide projector lens?

Can a 100 to 200mm slide projector lens be used as an add on telephoto lens for my small digital camera?  They're cheaper than used camera lenses.

Question by Hubiewan 8 years ago  |  last reply 8 years ago


camera's wont work with batteries? Answered

I got 3 different camera's, and they all 3 fail with multiple brand batteries. they start up, work the lense out, and then turn off. then, when i try to restart it, the same thing happens, only now the lense goes in, instead of out. it appears to be at least 3 different brands of batteries, all with 3 different camera's. the batteries that DO work, however have ran out. how is this possible? they all measure 1.5V (-ish, like all batteries) even the ones that did work. is it possible for manufactors to let theyr devices only accept a certain brand of battery?

Question by godofal 8 years ago  |  last reply 8 years ago