any *cold* slide projectors?

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meandihagee

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hello,

do you have a good idea on a slide projector that doesn't heat up while displaying a slide for 4-6 hours?

or maybe a nice slide projector for a fair price?

what do you guys use?

thanks
 
Good news: slide projectors can be bought for $5 at garage sales due to the move to digital photography.

Bad news: projector lamps have to be bright, and heat is an unavoidable byproduct. There is a layer of heat absorbing glass between the bulb and the slide, but the entire projector heats up, even with a cooling fan. Heat is an enemy of slide image longevity.
 
I used to have a very cute little leica pradovit, which I used for that purpose. It was one of the earlier models that took a straight tray, but it had manual transport. It was quite small, and had an almost silent fan. The light was not nearly as bright as some of the big models, or the kodaks etc., but for a medium space it worked very well. I gave it to my brother who used to use it to project images onto a painting canvas that he could trace.
 
The heat issue is due to obsolete incandescent bulb technology. It should be possible to build a LED slide projector that runs cool, and there are many DIY tutorials around, but LED technology only matured after slide projectors went extinct :-(
 
There were xenon arc and HMI options for some higher end projectors (I've used some by Elmo as well as after market modified Kodak Carousels), but these tend to be expensive even on the current used market. If it is only for one short event, there still should be light and stage rental companies that have some.
 
If you are going to project slides for long periods make sure you are projecting expendable copies rather than your precious originals. Most slides show noticeable fading with only a few hours of projector time on a typical projector, Kodachromes being worst of all with noticeable fading a possibility in under an hour. Once you move to Xenon etc projectors these times will drop considerably.

http://www.wilhelm-research.com/pdf/HW_Book_06_of_20_HiRes_v1a.pdf
 
What you can use is a modern slide projector with an efficient cooling system.
All modern slide projectors from the leading German projector manufacturers have efficient cooling systems.
Leica Pradovit PC, IR and RT-m, the Rollei MSC projectors, Rollei dual 66P multi format projector, the Braun (Paximat Multimag series) and Reflecta models (2500 series), the Kindermann silent 2500 series, and of course all Götschmann projectors.

Cheers, Jan
 
Surprising that Kodachrome would be the worst. I am guessing it must have been something about the later K-14 process. Even so I have slides that held up very well. Chemicals generated in a house fire, as well as the heat, don't do slides any good however.
 
majid said:
The heat issue is due to obsolete incandescent bulb technology. It should be possible to build a LED slide projector that runs cool, and there are many DIY tutorials around, but LED technology only matured after slide projectors went extinct :-(
Click to expand...

LED's still emit heat, just not through the bulb. They require a heat exchange off the rear.
 
oftheherd said:
Surprising that Kodachrome would be the worst. I am guessing it must have been something about the later K-14 process.
Click to expand...

No. It actually got better with each revision. Kodachrome was a very good dark cold storage archival film, but never has been good for presentation - mind, no slide film ever was (and if the material has improved today, decreasing lab QC will probably have eaten up much of these advances). Twenty years ago, Ektachrome was maybe four times as long-lived as Kodachrome, i.e. it failed by the end of the week when Kodachrome was already fading after one day - so that was no true solution either.

For professional slide shows, duplicating (via an internegative) to Vericolor slide was the common procedure. For fixed installations running 24/7 or the advertising slides used in cinemas, dye transfer (Technicolor) and Cibachrome duplicates weren't uncommon.
 
oftheherd said:
Surprising that Kodachrome would be the worst.
Click to expand...

No, not at all.
It is well known with slide film shooters that Kodachrome has excellent dark storage capabilities, but faded quite fast if it is projected many times.

My Kodachromes from the eighties, which have been regularly projected, show a color fading.
My E6 slides from the same period are still in excellent condition.

Color stability in E6 films has been even significantly improved during the last 20 years. Both Fuji and Kodak implemented improved color dyes in their latest E6 films.
The current E6 material is significantly better than the E6 films Wilhelm Imaging research had tested.

With the current Fuji and Kodak E6 films, properly developed and stored, you and your children will have brillant pictures to look at for the next decades.

Cheers, Jan
 
HHPhoto said:
What you can use is a modern slide projector with an efficient cooling system.
All modern slide projectors from the leading German projector manufacturers have efficient cooling systems.
Leica Pradovit PC, IR and RT-m, the Rollei MSC projectors, Rollei dual 66P multi format projector, the Braun (Paximat Multimag series) and Reflecta models (2500 series), the Kindermann silent 2500 series, and of course all Götschmann projectors.

Cheers, Jan
Click to expand...

Some additional information:

Slide projector manufacturers:
http://www.braun-phototechnik.de/de/products/list/~pcat.106/Diatechnik.html

https://reflecta.de/de/products/list/~pcat.5/Dia-Projektoren.html

http://www.gecko-cam.com/sales/goets...ukte-products/

www.dhw-fototechnik.de

http://www.rbt-3d.de/index.php?idcat=30

Cheers, Jan
 
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