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

Asked by Hubiewan 8 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?

Asked by davej6694 7 years ago


hi. what cheap product can I use for a filter to block the bright light so I can use my webcam for outdoor viewing??

I've used a pair of old sunglasses, and they work good. but i really want something square so I can afix it all together in a box. thnx.

Asked by okiimatsu 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

Posted by corey_caffeine 9 years ago


Pinhole Slide Projector

Hi! I have no idea whether this is the right place to post this topic, but it does say 'burning questions' and that's what this is, so here goes. :-) I've had this idea for a kind of pinhole lense slide projector. The (very basic) diagram is pretty self explanatory, and I was wondering if anyone's tried/heard of anything like this, and whether it could work? Do you think a 100 LED torch would be bright enough? Also, if I'm right in thinking that LEDs don't get hot, there shouldn't be a risk of overheating/fire should there? Thanks! Looking forward to hearing what you think! :-)

Posted by MissPennyFarthing 8 years ago


lenses? Answered

Can film camera SLR lenses be used on DSLR cameras?

Asked by paul46385 1 year 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

Posted by ostomesto 7 years ago


What can i make out of a old but working video camera, It is a JVC GR-AX280?

It is a JVC GR-AX280, it is old, the batteries arent discharged yet, however it uses small VHS tapes and those are expensive and old, and tend to not work as well as they should. The other thing is it still woks perfectly fine its just i want a DSLR and i thought mabey making a temporary one out of the lense and etc from it. It also has a almost microscopic LCD type screen where they eye peice is and i thought about making like a hud or somthing. But i am at your mercy people of instructables, do your worst :D

Asked by Jakesthebest 8 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?

Asked by spydog4 8 years ago


is it possible to make a laser beam more powerful by adding more lasers?

Iv been looking at the laser cutter 'ables and am wondering it its possible to combine say 10 fairly high powered (cheap/er) lasers into a single beam to create a more powerful burn. id prefer not to go out and buy $2000 worth of laser which ill most likely break. or get arrested for trying to bring through customs. i was thinking of using a diverging lens to make the spread out rays in a parallel path. in diagram i understand that mounting the lasers will be a challenge.. but will constructive/deconstructive interference be a problem.. i didnt listen to well in physics. any ideas would be appreciated grim out.

Asked by grimgroper 9 years ago



how to paint clear plastic? Answered

I'm making a halo spartan costume. For the face panel I'm going to paint it gold. How the heck do I paint over it and still be able to see through it

Asked by General Eggs 7 years ago


i Need a decent camcorder with a professional look?

I am looking all over the place and can't find an Over the shoulder camcorder under $1000. definition doesn't need to be HD but an external mic input would be nice. i need a camera that looks like you know what you're doing because it feels awkward asking people questions with a dinky HD cam. if over the shoulder isn't possible anything big would be nice. anything would be nice but SD or HDD would be nice.

Asked by redsuit09 8 years ago


High Power LED Collimating optics for projector project.? Answered

Greetings; My projector currently has a high pressure fancy schmancy bulb and when it goes (after another few thousand hours hopefully) I want to replace it with a high power (~100 watt) LED.  That's the easy part.  I can interface with the projector and convince it there is a real bulb firing up - but I need the optics.  Basically, it's a DLP projector so all the light has to be focussed on just under a 2x2cm square hole to hit the colour wheel.  The LED in question is already over that size on the diode die alone.  There are parabolic reflectors available (I think my best option) but they still have a positive beam spread - I need a shrinking beam.  It doesn't have to be perfectly collimated, but I bet that helps.  The original lamp definitely has a converging beam but its hard to measure as you can't operate the lamp with the cover open (safely). SO I'm thinking diode >> reflector (like flashlight) >> convex or fresnel lens. I can't get better measurements at the moment for I'm not near the machine and its finnicky to take off the ceiling.  Penny for your engineering thoughts? What I need but have never seen commercially:  http://en.wikipedia.org/wiki/File:CollimatingLensSVG.svg LED to use: http://www.dealextreme.com/p/prime-100w-7000lm-led-emitter-metal-plate-warm-white-42807 dimensions about 5x5.5cm Reflector I have in mind: http://www.dealextreme.com/p/20-100w-silver-plated-plastic-smooth-reflector-58mm-39963 (rather wide beam still) Alternate reflector: http://www.dealextreme.com/p/20-100w-silver-plated-plastic-smooth-reflector-50mm-39974 So...what I need are lens options.  Based on my estimations I'll have several cm (up to 10cm) to come up with a good focus distance.

Asked by frollard 7 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

Posted by Joella Erspamer 6 years ago



How can i focus two or more (infra red) led's into one tight beam? Thanks

This would be for a laser tag gun, more than one infra red LED could greatly improve distance (so it is theorized) but if you think it wouldn't, give us a yell. How it normally works in the gun, is a high powered infrared LED with an already tight beam of about 20 degrees is projected onto a double convex lense about 2 to 5 cm in diameter. The beam is focused by moving the LED back and forwards with snipers having tight beams for the longest range and others having very wide beams to limit range and but improve accuracy at close range. Any help is much APPRECIATED. OH and someone recommended a cube beam splitter but i have no idea what they are so you may want to look them up... THANKS COMMUNITY

Asked by DELETED_D4VOBRO 9 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

Asked by rickharris 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

Asked by QuickTime 8 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?

Asked by ahburn 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.

Asked by nruegs 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. 

Posted by mskogly 2 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.

Asked by Neg8tyv 8 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?

Asked by yonch 6 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?

Posted by SolarFlower_org 9 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

Asked by DELETED_Electorials 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...

Asked by SWV1787 9 years ago


Night Vision Goggle Help. Also cable identification!

 Hi Everyone, I am trying to make my own night vision headset/goggles following this kiplay's guide. I have a electric viewfinder from an old JVC GR-AX5 video camera. I have removed the viewfinder and dismantled it but I am not sure which of the 7 cables are, (i.e. ground, power, video etc). How would I identify this, and could you please go in-depth as I am not hugely experienced in electronics, but I am learning. I have enclosed pictures, if that helps, but I do apologise for the poor quality. As the picture is hard to tell, the cable colours are (not in this order); Black, white, red, redy/brown (i am unsure, i am colourblind), yellow, orangey and a pinky purply colur.  How do I identify them? On a second note, for anyone who has followed this tutorial, can you recommend a good camera to get in the UK? Many thanks, and I hope someone can come through for me, Alex

Asked by homedogalex 8 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 :)

Asked by astroboy907 7 years ago


how to make a home made projector?

By using a  std convex lenses. 

Asked by amit16121992 7 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!

Asked by cameramenace 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)

Posted by Jordo 9 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

Asked by johnnywgk 9 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.

Asked by Ahtasham Ahmad Mohtashim 2 years ago


Screws set ? Answered

Where do we find the set of nice looking screws which is used to fix the crystal ball lense

Asked by stallion_aaa 1 year 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

Posted by adamtj 10 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?

Asked by sParekh 9 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?

Asked by rickharris 6 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... 

Posted by 000123000 7 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

Asked by this time use more propane 8 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.

Asked by SaumiJoshi 5 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?

Posted by Weissensteinburg 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!

Asked by matisha23 6 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!

Asked by victus_maestro 9 years ago