35mm slides, overhead transparencies


Approximate width of 35mm slide image projected onto the screen with lens focal lengths from 50mm to 150mm.

50mm 39" 78" 118" 157" 197" 236"
75mm 26" 52" 78" 104" 130" 156"
85mm 23" 46" 69" 92" 115" 138"
100mm 19" 39" 58" 78" 97" 116"
125mm 16" 31" 47" 63" 79" 94"
150mm 13" 26" 39" 52" 65" 78"

To get a larger image on the screen, keep the projector in the same spot and use a shorter focal length lens.

Photographic Specialties is no longer producing slides and transparencies. I have been self-employed for 35 years, but looking forward to retirement since my wife died five years ago. With the decline of conventional photography and the recent recession, the availability of film and chemicals as well as the volume of work has declined to such an extent that it is no longer possible to have fresh chemicals to develop film. I hope that if you still need conventional slides and transparencies, you will be able to find someone who can produce them for you. Thank you for your orders over the years.

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