Scan Slides with Kodak Carousel Projector (Hack)

ColSebastianMoran

( IRL Richard Karash )
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Could I hack a Kodak Carousel projector to make a slide-scanning rig? Use the slide-by-slide feed to speed up camera scanning? Point a camera right into the opening, use AF, and make my captures?

Then I saw this. It's a commercial product "SlideSnap" and it's expensive. I think I could hack something like this.

EDIT: Jump to Page 2, post #50 for summary and how-to instructions.

190112-SlideSnapPro-Carousel-SlideScanner.png
 
So, first of all, anyone else tried this?

If you google "Carousel Slide Scan" you'll find a few, some with hints and suggestions. I'm gonna start blindingly simple, to get a feel for the challenge.
 
Oops, we need a diffuser for the light. Opening the light box on this 760H projector, I can slip in a sheet of diffusion material between the condensing lens and the slide. There is plenty of room.

[ EDIT: This isn't the best place for the diffuser. See #37 in this thread. ]

190115-CarouselSlideScanner-Diffuser-IMG_2607.jpg
 
Last edited:
Col--VERY clever! Hope it works well for you!
Be cautious of the heat coming from the projector lamp--it can be vicious!
Best of luck--and thanks for posting.
Paul
 
Conclusions so far:
- Need better diffuser. (The mottled sky in first photo; those aren't clouds)
- Without hacksawing the projector, and with this "normal" focal length macro, I get about 1.5MPx out of my 24MPx camera. I will have to hacksaw the projector to get closer to the slide and probably also use a longer focal length lens.
- WB on these is 3400°K; that matches spec 3350°K for the ELH bulb in projector. Good.
- But, I want to get rid of the heat and get a bulb with less brightness. The ELH bulb is 300 watts (Yikes!). I want to figure out how to get an LED bulb into the housing.
- The workflow looks great: Slides in carousel or stack loader. Press to advance slide. Click to auto-focus and expose. I can run 100 slides in perhaps 10 minutes. Repeat. Then load the whole set into Lightroom.
- Slides have a lot of contrast. I might just bracket exposures and HDR the good images in Lightroom.
- My Coolscan will probably do a better job with color and tonality; I'll want to rescan the keepers.
- So far, this might be better overall than sorting slides first, then scanning the selects. Should be able to produce satisfactory files for record shots, snap shots, and I have thousands of these.
 
I think this is a tremendous idea for auto-loading slides for duplicating. Your results look good to me so far, with the caveats that you yourself made - more light diffusion, getting closer for higher res.
One thing that occurs to me, with the heat that projector lamps generate (and I know you want to try an LED lamp), do you wait for the slide to pop and then focus, stopping down for depth of field, or do you snap the duplicate as soon as the slide moves into place? Having said that, i don't see any edge unfocus in your examples.
 
This is a great idea. I may do some fiddling myself...I have thousands of slides and the vast majority don't need hi res...the ones that are worth the effort can be scanned with my Dimage.
 
... do you wait for the slide to pop and then focus, stopping down for depth of field, or do you snap the duplicate as soon as the slide moves into place? Having said that, i don't see any edge unfocus in your examples.

The projector bulb is 300 watts. I'm going to look for a far less hot solution.

As for edge unfocus, too early to tell. Slides are not perfectly flat. Will see.
 
"The projector bulb is 300 watts. I'm going to look for a far less hot solution."

Colonel,
I suppose the new bulb need not be very bright at all since you won't be using it for projection. If you use an LED bulb your shutter speed will have to be slow enough to allow for LED flicker, but I'm sure you've factored that in.
 
"The projector bulb is 300 watts. I'm going to look for a far less hot solution."

Colonel,
I suppose the new bulb need not be very bright at all since you won't be using it for projection. If you use an LED bulb your shutter speed will have to be slow enough to allow for LED flicker, but I'm sure you've factored that in.

LED flicker... Good point.
 
Please comment!
Won't the substitution of a cooler light source result in colour temperature and gamut complications? The colour of those old slides shown above looks gorgeous by the way.

How would the results from photographing the projected image on a flat screen compare with what you've done so far? I realise it wouldn't be high resolution, but as you've got a couple of megapixels worth, so far, is it worth making a comparison?

I don't know a lot about Carousel projectors, but am aware there were various lenses of greater or lesser quality and in at least some cases, the option of installing a better than standard lens. And that the Ektagraphic models tended to have better lenses as standard equipment. Hence I suppose the results from imaging off a screen would have to depend partly on the quality of the projector lenses you have access to.

It seems that once set up it would not take much if any longer to record the image off a screen compared to what you have done above, so perhaps it's worth a quick comparison?

Generally, do members have much interest in Carousel projectors? I've ended up with several projectors of varying quality including a Leitz Pradovit and Rollei P-11 but have always admired the Kodak Carousels. A year or two back I was gifted the very first model Carousel Kodak marketed, in fully working mint condition in box. I believe identical to the example which featured in an episode of Mad Men. I was surprised at how well designed and featured it was for its day. It's far from being the best Carousel model for regular use in 2019 (parts, etc.), although, I have used it a few times. But I can post up some pics of it in a few weeks when I'm back on my feet again if there's enough interest in seeing it.

Cheers,
Brett
 
Next step: APS camera (D300 is handy, 12MPx). 105mm Micro-Nikkor. Same arrangement, hand held, shooting into the hole. Nantucket 1970. (Ignore the mottled sky; that's my crummy diffuser.)

I think this is encouraging. With APS and 100mm macro lens, I can fill the digital frame with the slide contents. I won't have to hacksaw the projector. About 10MPx in this image.

So, next steps: 20 watt 12v bulb, better diffuser, solid camera mount, more careful alignment. That'll be in a week or so.

190115-CarouselSlideScanner-Beach_D039119.jpg
 
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