How else will the slides get exercise?
Definitely. I can even get them fairly locally. But my concern is that even with heat-absorbing glass, there is considerable heat that can't be doing them any good. It makes the slides pop in short order, necessitating refocusing.
How else will the slides get exercise?
"Superslide" was the designation of a slide mount with the standard 50x50mm outer but a nominally 40x40mm opening. Thus yielding the chance to project full-size images from type 127 film or cut-outs from types 120, 220 and 70mm, typically already composed for that smaller image size.
By this one could use the common projectors and storage systems for MF slides.
Typically the condensor had to be changed for full-edge illumination of superslides. Anyway superslides and standard slides could be projected intermingled.
Nothing needs to change to project the 2x2 slide.
Anyway superslides and standard slides could be projected intermingled.
As I said above:
You CAN project superslides in any 35mm projector.
BUT:
The illumination in a 35mm projector is typically optimized for a 42mm window. Thus for the 57mm of the superslide the illumination must be adapted.
This is explicetely described at the manuals of Carousel models.
Of course manufacturers have also chosen to leave it at the 35mm format, or to design the projector from the start for the superslide format, which then reduces the illumination of the 35mm slide.
That you do not see such issue mentioned at your model of projector does not mean that the issue does not exist... optics are universal...
As for spare parts, unfortunately the parts that failed on my 750H were plastic gears, and all those plastic parts are now about the same age, so...
When I replaced these gears the first time, in 2010, I believe the parts might have been new old stock from Kodak. (focus pinion gear, motor worm gear, and spur gear)
Nine years later the focus pinion gear broke again. This time I discovered the part was available from a third party that has taken the initiative to have the gears injection molded using modern plastics that should last longer than the original Kodak parts. Fingers crossed.
I bought the parts I used from eBay seller "atomk" Tom Kelly / A.T. KellyWhat was your source for these parts? Also, before I retired from the National Gallery of Canada, our AV people used to have slide projectos serviced by Doug Banks, link here: https://photographicrepairs.com/replacement-parts/kodak-projector-parts/
I guess the vignetting is not that bad. I borrowed a good number of 2x2 slides from the library and they projected fine with my Ektagraphic III. I tried to scan them it's when my 35mm slide scanner won't scan the whole frame. So I have to use the digital camera instead.
As I said above:
You CAN project superslides in any 35mm projector.
BUT:
The illumination in a 35mm projector is typically optimized for a 42mm window. Thus for the 57mm of the superslide the illumination must be adapted.
This is explicetely described at the manuals of Carousel models.
Of course manufacturers have also chosen to leave it at the 35mm format, or to design the projector from the start for the superslide format, which then reduces the illumination of the 35mm slide.
That you do not see such issue mentioned at your model of projector does not mean that the issue does not exist... optics are universal...
It wouldn't surprise me if an Ektagraphic III were designed to evenly illuminate a super slide. The Ektagraphic projectors were designed for commercial, institutional and educational use - a more demanding and varied environment than the Carousel projectors were designed for.
Kodak Carousel projectors were designed to project super slides without vignetting.
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