From: David Tetzlaff (email suppressed)
Date: Fri Dec 24 2010 - 14:24:54 PST
AFAIK the definitive analysis is here:
http://www.city-net.com/~fodder/bolex/truth.html
To skip all the detailed discussion of optics and summarize: it's about aperture, not focal length.
> STANDARD C-MOUNT LENSES WILL WORK WELL THROUGH THE BOLEX PRISM PROVIDED THAT THEY ARE STOPPED-DOWN PAST ABOUT F/3.2
>
> This rule contradicts the rule given in the Bolex literature that for focal lengths less than 50mm and only for these, H16 RX cameras require RX-mount lenses. In fact a very fast 100mm C-mount lens will give poor results wide-open on the Bolex H16 RX, whereas a 10mm C-mount lens will give fine results stopped-down on the Bolex H16 RX. There is no truth in the old prescription.
>
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