Framing 35mm slides for projection

Matus Kalisky said:

Hi, I have just visited my friend who has Leica Pradovit 300 IR projector (with the 90/2.5 lens). It was really a treat, but it was not possible to get the whole image sharp. As the wall was flat I have check a few of the slides and indeed one could see a slight "bulging" of the film in the frames - maybe around 1mm - but it was obviously enough to cause problems.

Just a note - he is using glass-less mounts of "newer" type whatever that means - definitely compatible with his projector.

So - I would like to ask - how do you make sure that your framed slides are nicely flat? Glass mounts? Special mounting? Are some particular mount more suitable than others?

I am asking as I may finally get a 35mm camera just to be able to project slides - it really looks cool (No, I do not plan to get into projecting 6x6 slides as of now)

thanks

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silveror0 said:

There is another solution that will help, and that is to use an auto-focus projector. When the slide pops out of focus due to heat from the bulb, the projector will instantly re-focus and maintain sharpness over the whole image.

Back when I projected slides, using two projectors with a professional controller for lap dissoves/cuts/etc and synchronized with sound track, I used a pair of Kodak Ektagraphic AF-2 (auto-focus) projectors with zoom lenses. They were set up to project onto a 70x70-inch lenticular screen that could be tilted at the top toward the projectors (to eliminate the "keystone" distortion of the image), and the zoom lenses could be adjusted so that the projected images were perfectly superimposed. While one projector was showing a slide, the other projector had a slide in position being pre-warmed by its bulb, so that any slide being projected had already been "popped" before being seen on the screen.

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