How to digitize 35mm negatives

One of the best ways to preserve old photos is to copy the  negatives with a digital camera and then use  image processing software to "develop" the photo.  

I built a setup for digitiziation with a  DSLR to process my old negatives some of which have a  sentimental value.

 Since I do not have a macro lens, I combined an SLR  lens with a  couple of cheap adaptors. The rest was improvised from pieces of wood,  cardboard ,  PVC and even meccano parts.

Step 1 About film negatives

Image formation

• Film photography is based on the sensitivity of  silver halides (AgBr, AgI etc) to light. The upper layer of the film is a coating of gelatin containing crystal grains of silver halides.

• When the film is exposed to light, some Ag+ ions are excited to higher energy states and a few combine with electrons to form Ag which will act as nucleation centres in the development stage. At this point the latent image is formed .

• When the film is developed with chemicals,  an oxidation - reduction reaction takes place. The silver ions in the exposed regions are reduced to neutral silver atoms which coagulate to form metal grains. This is a negative image since the film becomes non transparent in the exposed regions.

• Colour photography is based on a variation of this process with the addition of organic coloured dyes coupled to the silver halides. The film coating  has three layers for the three basic colours (see photo).

Deterioration of negatives

• Black and white negative images consist of silver grains which are stable over time. The supporting gelatin is sensitive to humidity and temperature but if stored properly B/W film can last for hundreds of years.

• On the other hand the colour negatives are more sensitive to environmental factors because of the organic dyes they contain. The cyan dyes fade away faster and the negative becomes reddish. Exposure to light causes the magenta dyes to fade also, due to  ultraviolet  light.

Comments

[FioriOnFire]

Would this work for a camera without a lens?

[tholopotami]

I think not. The size of the camera sensor (mine is 17mm) is much smaller than the size of the negative (36mm) and you need to form a "light cone" to match these sizes. This is what a lens does. If you just "project " the image on the sensor you will lose a large part of the image.

However if you just use any lens there will be deformations at the edges of the field. You have a choice between what I describe in this instructable ( a regular lens system + extensions --> a macro lens) and any camera that can be zoomed to the size of the 36mmx24mm negative at a tolerable distance.

[tjok]

In step seven, you said "I made this as an independent module in order to use it for other projects". Just curious, what other projects did you use it on?

[tholopotami]

Case 1: I found a nice 480mm apochromatic objective lens system and I wanted to test it as a spotting scope. For this I mounted it on the end of a long rectangular board and used the mecano x-stage to focus a telescope eyepiece mounted on the other end. The whole thing was covered by a tube of black canson paper This allowed me to calculate distances for a future construction of the scope.

Case 2: I have something in mind related to micro-milling . If (and when) I do it I'll probably make an instructable about it. Stay tuned!

[useraaaaa]

why DSLR

there are million of compact 10+ megapixel cameras,
with "close up mode".

it is possible to set enough light,
it does not move,
no complications with DOF


(i mean DSLR is not soo important)

[Techsupportnerd]

DSLR because most point and shoots won't capture the wonderful dynamic range of film!

If you are scanning old negatives it is one thing, but if you really want a decent scan you should be shooting raws on a dslr.

But yeah, like tholopotami says, the idea is that you use what you've got!

[tholopotami]

Indeed "raws" is the best way to control colours separately. They should be used in the case of coloured films.

[tholopotami]

The point is that for this task it is better to use the best equipment you have. Before getting the DSLR I did the same job with a compact camera and a similar setup. Of course it can be done.

[meddler]

Would a Cannon eos xti work?

[Kennuf]

Not until you look at the front of the camera and learn how to spell "CANON".

[tholopotami]

I do not see why not. If you want to mount an SLR lens with extension rings as I did the first thing to look for is an M42 adaptor for your model. They do not cost more than 20-25Euros. A set of M42 rings is less than 10 Euros on e-bay. By combining a couple of these rings you can adjust the frame as good as possible.

[meddler]

thank you I will look for that. I appreciate the help.

[meddler]

Never mind.... I do wonder if I have the ability to build this. It is just what I'm looking for though.

[dkennedys8]

Glad to see someone else rocking Olympus DSLRs!

[avatar_i]

Nice Instructable.
I also have an Epson V-700, and it does GREAT on [minimum] 6x7 cm negs, and 4"x5" to 8"x10", but I have beed dismally disapointed with 35mm and 6x4.5 negs.

I did, however, find an old film era slide copier that has a t-mount base that will mount onto- and work on- nearly any digital camera, except for the entry level models. They work with negs and mounted slides.

Total cost, about $8.oo [since I already had a t-mount adapter], from the used bin at the local camers store. Most stores don't carry them any longer, but look around. Most camera store employees don't even know what these things are, and they were all over the place just 10~15 years ago!

Using a Nikon D300, I have made exceptional hi-res copies of some WWII negatives I have been looking to print, but couldn't afford to leave with the store- or pay their charges for lower quality scans.

[tholopotami]

Thanks for noting this. I forgot to mention the option of trying to find a slide copier for SLRs.

[hardwarehank]

Cool. I'm getting extremely good results on my slides and negatives with my Epson V700 scanner. It costs around $500, though, so this method would be awesome for someone on a budget. Normal flatbed scanners can't do negatives properly.

[Ninzerbean]

I have a $49 Epson scanner, I use it all the time for black and white negatives, i just reverse the image (blacks turn white, etc) in photoshop after scanning. I'm sure most free photo editing software programs have that option too. My negatives are over 50 years old, it's hard to even see what is on them, so this is pretty magical when they come into view.

[hardwarehank]

Yeah, color negatives are really hard to do without a really expensive scanner - I'll bet B&W works fine like you say though. It is really cool to see what comes out - my slides from the 50's look amazing.

[tholopotami]

I believe you about the 50 years old negatives. B/W contains only silver microcrystals which will stay there as long as the celluloid can keep them.Only the medium is subject to aging (becomes more yellow because of UV exposure).
Things are different with colour dyes (see step 14)

Thinking about the DSLR setup here is another advantage: When working with B/W I use a projector and an opaque screen. This produces an homogeneous and parallel light beam which helps increase the contrast of the negative image. This may improve the final result compared to a scanner.

[tholopotami]

Thanks! As you say the problem is that you need more than a normal scanner to do the job decently. The advantage in my case is that I already had all the equipment ad did not have to buy anything. With the DSLR you can experiment a lot . For example you may change the "filament temperature" for lamp exposure from 4000-7000 depending on the light source you are using. This is useful the case of old colour negatives. Even better, with this setup you may use sunlight by pointing to a white wall. It works very well.

[sferroni]

You can get far better results using the color curves tool, which I did on your second image with GIMP. The result is here attached.

[tholopotami]

It looks better than those I posted!

[tholopotami]

Thanks for trying this ! In fact I hesitate to use the curve tool since I do not have much eperience with it.

[thepaul1993]

Is that a Olympus E-420?

[tholopotami]

Yes. It is the less expensive of the series and it is also very light. I have an additional 150mm telephoto of the same brand and I modified an older 200mm telephoto for it (see one of my other instructables). I also use it on telescopes.

[marcintosh]

It is not a surprise that films are still used for specific applications such as aerophotography.

I feel that the move to digital, while good for business and in certain respects the environment and my personal ecomomy (I can now shoot as much as I want last year 5k pix) has been a case of throwing the baby out with the bath water. Negs aren't OS dependent or Harddrive dependent nor do they need power to be viewed. Look to see the prices on medium format cameras on ebay- those guys aren't giving up, neither are the large format shooters..

Thanks for the Resolving Power work with the math - much appreciated.  All in all a very interesting Instructable.
Thanks again,
M

[tholopotami]

I am glad someone appreciated the calculations!

[e5frog]

Cleaning the table was perhaps not the thing I thought about as much as setting focus to something in the picture. ;-)

[tholopotami]

You are right, what can I say!

[e5frog]

Maybe it was because we wasn't supposed to see the dirt! ;-)
Nice instructable, almost make me want to make my own - but I don't have one of those flashy cameras. Maybe I'll try hooking up a lamp on top of the flat bed scanner instead...

[tholopotami]

Before getting the DSLR I used a compact camera of 5Mpxls. I set the camera at 3x zoom and infinity focus and also put a large 4x magnifying lens in front of it. This must be as large as possible to avoid distortions. Then I used the film holder with the x-stage but this time to focus since you cannot focus with the camera.

[efra5]

amazing, thanks!

[banker]

You put a lot of work into this. 100 Quatloos!

[tholopotami]

Thanks! I have been experimenting on the method and trying various setups with different cameras , in my spare time , for about a semester. I really enjoyed the results specially in B/W.

[useraaaaa]

"gap between the frames" is important/
it can be used in the photoshop to set "white point" and "black point"

[tholopotami]

Thanks for pointing out this. It is a valid tip. In order not to loose pixels by exposing also the gap I prefer to select this manually by adjusting tone levels even for colour negatives.

[nanosec12]

this is an amazing journey that you have invited us to join you on. I enjoy the images you used to demonstrate your process, and I will no doubt be doing something similar to preserve my old negatives. thank you for the great instructable, 5 of 5 from me.

[tholopotami]

Thank you for your kind comments. Indeed I enjoyed the journey also!

[arduino man]

cool