SF24D With M8

[Stan Yoder]

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OK, I did yet another test. Basic: TTL, DNG, ISO 320, camera comp -1, 1/125th, subject a dark room (not darkroom!), f2.8 with the 24mm.

 

Shot 1: reference shot - flash set at f2.8 like the lens, no flash comp.

Shots 2,3,4: -1,-2,-3 comp. Images progressively underexp.

 

Shots 5-6: back to zero comp, but flash aperture f2, then f1.4 (lens still 2.8). Images progressively underexp..

 

Shot 7: -3 comp, flash aperture f2, then 1.4. These were progressively darker than shot 4 above (-3, flash f2.8.)

 

My conclusion is that both comp and flash aperture work in TTL, as does the combination of comp AND flash aperture. I'm sure there are limits to this squelching of the output, but apparently I did not exceed them in this test. If I had had a foreground subject, it might have been a different story.

 

Hope this helps.

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[dpattinson]

OK, I did yet another test. Basic: TTL, DNG, ISO 320, camera comp -1, 1/125th, subject a dark room (not darkroom!), f2.8 with the 24mm.

 

Shot 1: reference shot - flash set at f2.8 like the lens, no flash comp.

Shots 2,3,4: -1,-2,-3 comp. Images progressively underexp.

 

Shots 5-6: back to zero comp, but flash aperture f2, then f1.4 (lens still 2.8). Images progressively underexp..

 

Shot 7: -3 comp, flash aperture f2, then 1.4. These were progressively darker than shot 4 above (-3, flash f2.8.)

 

My conclusion is that both comp and flash aperture work in TTL, as does the combination of comp AND flash aperture. I'm sure there are limits to this squelching of the output, but apparently I did not exceed them in this test. If I had had a foreground subject, it might have been a different story.

 

Hope this helps.

 

Interesting - I'm going to try this again on my camera. I thought it should work.