[Frameworks] Non reflex lens compensation

[Beebe,Roger W]

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 bolexcollector.com<http://bolexcollector.com> 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:

http://www.bolexcollector.com/articles/07_03_21.html

<http://www.bolexcollector.com/articles/07_03_21.html>...
Roger


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?
Thanks!
_______________________________________________
FrameWorks mailing list
FrameWorks at jonasmekasfilms.com<mailto:FrameWorks at jonasmekasfilms.com>
http://mailman-mail5.webfaction.com/listinfo/frameworks

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman-mail5.webfaction.com/pipermail/frameworks/attachments/20101224/46ad5213/attachment.html