Color Correcting two shots, each different exposures?

G

grantw

Well-known member
I shot a segment with a 2nd camera man. We both had T2i's. Used the 18 - 55 stock lens. white balanced on the same card. Same ISO (1600). And double checked cameras settings and everything looked the exact same.

The images I got back where completely different.

I was at shooting on mostly 55mm / 5.6 and he was opened at a closer to the 18mm end which opens more to 4 the whole time. But still I feel like some shots are similar focal lengths but still different images. anyone know whats goin on or how to correct it? Thanks,

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Cam A (35mm ish)
http://img152.imageshack.us/i/screenshot20110110at940.png/
Cam B (35mm ish)
http://img832.imageshack.us/i/screenshot20110105at105.png/


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Cam A (18mm ish)
http://img831.imageshack.us/i/screenshot20110110at942.png/
Cam B (18mm ish)
http://img842.imageshack.us/i/screenshot20110110at941.png/
 
The most obvious thing I see is that the exposure looks different. Since the cameras are at different angles and were running at different apertures, this is not surprising at all.

Furthermore, it looks like camera B is overexposed at about the amount you specified (f/5.6 vs. f/4).

During color grading, you'll want to lower the brightness of camera B and hope you didn't lose much highlight detail to clipping.

Good luck!
 
And aperture is just as important when trying to match two cameras. If you're both shooting with non-constant-aperture lenses, then you need to make sure there's enough light available so that both cameras can expose properly at the small end of the aperture/zoom range (in this case, 5.6). And the kit lens opens to 3.5 at the wide end, which can cause some pretty dramatic differences in exposure.

Your better bet is to choose constant-aperture zooms (if you really need zoom lenses), or primes.
 
Yea I know about the consatent-apature. There was a misunderstanding between us and I thought he was shooting mostly at the 55mm end. But i wanted to double check that it was the exposure and the best way to go about fixing it.
 
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