So I just found out about the phenomenon of "focus breathing".  I was trying to make a nice rack focus, and the frame zoomed in pretty noticeably.  I'm using a photo lens because I thought that made sense for stopmo, but as I understand it, they don't correct for the breathing like cinema lenses do.

How do you guys handle the breathing effect?  Is it better to get cine lenses, or can you adjust for it in post?

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Well, here's a blog entry  detailing all the lenses I'm using with my G1.

The TV lenses are CCTV lenses really, they just all say TV on them and it's easier to type than CCTV. I'd call the c-mount 16mm movie camera lenses I have low-end cine lenses! But then you can get into high-end pretty quick that way too, if you want newer lenses than maybe the 60's or 70's with the newer optical coatings and made of lighter stuff than machined steel. 

I think technically though your statement is correct - they don't make low end cine lenses. Not now anyway - but they DID... you just have to look on ebay and get the used ones from decades gone by. 

^ Oh, and just to be clear - the CCTV lenses are also often used in television studios and for many other reasons - sometimes on security cameras etc. Very good versatile lenses and my personal favorites of all the lenses I've bought. Though I also frequently use my Micro Nikkor 55mm for its extended focal range. 

I guess I should say that these lenses I'm using are too small to work on a DSLR camera - for instance the c-mount lenses. The image circle for them is approximately an inch in diameter - the same size as the sensor for my micro 4/3s camera (Panasonic Lumix G1). But only about half the diameter of APS-C sensors (and much less than half the diameter of a full-frame DSLR sensor). 

Sorry, it's been a while since my research period and I have a pretty crappy memory - I tend to forget I use a smaller sensor than many people on the board do. 

But the ability to use all these kinds of lenses is a big part of the draw for M43 cameras. 

Decided to look up a chart - actually my M43 sensor is almost the same size as APS-C:

(Micro four thirds uses the same sensor as four thirds)

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