Re: [Frameworks] Non reflex lens compensation

From: Beebe,Roger W (email suppressed)
Date: Fri Dec 24 2010 - 14:09:46 PST

You do lose light to the viewfinder (1/2 to 1/3 stop, I think) and supposedly RX lenses by Kern/Switar have that built into them, but know also that if you're shooting on lenses that are shorter than 26mm, you're going to have focus issues. (Just read on the<> site that it's 50mm or less, but I've heard 26mm in the past.) Someone who knows more physics/optics than me will have to explain why exactly, but I think it has something to do with the back focus & the light passing through the beam-splitting prism. See here for more:


On Dec 24, 2010, at 3:14 PM, Lyra Hill wrote:

I'm shooting on a Rex 5 Bolex with non reflex lenses. Should I
compensate for this? How much (if any) do the f stops of reflex and
non reflex lenses differ?
FrameWorks mailing list
email suppressed>

FrameWorks mailing list
email suppressed