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why flash compensation with iTTL for regular exposure?

ddubyaw

Atlanta, US
256 posts

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ddubyaw Registered since 29th Oct 2005
Sat 14-Jan-06 05:35 AM

I'm curious why flash compensation is necessary with iTTL if you want the flash to produce a regular exposure.

For a typical lousy indoor snapshot, I can have an SB-800 in TTL mode (normal TTL, not BL) aimed at the subject with 0 flash compensation, and it'll produce a correct exposure for my camera (supports CLS).

If I then aim my flash upwards to bounce it off the ceiling, I'll get drastic underexposure. Obviously this is because I lost light due to the bounce and the extra distance required to make the bounce, but with iTTL, why does that matter? With TTL, shouldn't the camera be able to keep the flash firing longer until a correct exposure made?

Instead, I have to histo-guess at +1, +2/3, etc. flash compensation for the bounce -- seems unnecessary with the technology, or am I missing something?

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