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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

IBC '07 Impressions

the back focus of "Hollywood", which I used a while to play with, was clearly way OFF. As there is no back focus adjustment, the answer was to put rings within to adjust, "like in a real film camera". Sorry guys, trying to make a digital film camera doesn't necessarily mean to must follow old bad tracks. It can be done better, there had been cameras at the show which do that better, so thats a bad point. My point with this is that when you really aim at exchanging lenses and their back focus may differ, you'll have to play with those rings, lots of notes and always the hope its right now.

I am not really qualified to comment, but I will anyway :-). If you have to handle, transport and store shims separately from lenses, this sounds awkward. I thought the shim would somehow be stuck in or on the lens mount so it didn't have to be handled as a separate piece during normal work.

Is it true that designs with continuously adjustable backfocus are better in all cases? What is your experience with adjustable backfocus cameras (esp. with S35 frame sizes?) Does back focus sometimes get accidentally mis-set during use? Do small bumps and vibration have any effect? Does temperature change affect the adjustment?

It's my understanding that the mount is one of the "modular" parts. If so, I could imagine Red or someone else making a new mount you could swap in, with different backfocus arrangements, if there was demand for it.
 
I am not really qualified to comment, but I will anyway :-). If you have to handle, transport and store shims separately from lenses, this sounds awkward. I thought the shim would somehow be stuck in or on the lens mount so it didn't have to be handled as a separate piece during normal work.

Is it true that designs with continuously adjustable backfocus are better in all cases? What is your experience with adjustable backfocus cameras (esp. with S35 frame sizes?) Does back focus sometimes get accidentally mis-set during use? Do small bumps and vibration have any effect? Does temperature change affect the adjustment?

So far as I know, (I've been out of the loop for a while) there are no motion picture cameras with field adjustable flange focale depth.
 
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