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RE: Eclair ACL more ACL basic questions
Schneider-Kreuznach Cinegon RX 1.8/10mm
Schneider-Kreuznach Cine Xenon RX 1.4/25mm
Can I use these on the ACL? Any thoughts on these lenses?
You can use them with some provisions. I've cut and pasted part of an
article I found years ago on the web. I think I got it from the Small
Movies website (a Bolex site). I've used this rule with no problems so
"RX RULE: 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 RX RULE is reversible. RX-mount lenses will work well on C-mount
cameras provided that they are stopped-down past f/3.2. There are also
implications for macrophotography. For example, at 1:1 magnification the
effective f-stop of a lens is twice the indicated f-stop. So at 1:1 an
f/1.6 C-mount lens will work about as well on an H16 RX camera as on a
C-mount camera, and similarly for an f/1.6 RX-mount lens."
--Dennis Couzin 3/76
Keep in mind you can have an RX lenses recollimated for standard C-mount
useage but I'm assuming you still want to use them with your Bolex so
that might not be an option.
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