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New CLS Preflash Sequence Images

picmax

Boise, US
57 posts

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"RE: New CLS Preflash Sequence Images"

picmax Registered since 03rd May 2007
Mon 16-Nov-09 01:59 AM


>Max,
>
>I read your discussion about how multiple remote flashes
>operate.
>
>My results were quite different. Whenever two remote TTL
>flashes overlapped, the image did increase in brightness by
>about 0.7 stops(assuming both were set to the same power).
>
>Here are a couple of things I have noticed:
>
>1) Books with shiny covers are not good subjects when you are
>up close. The reflected specular highlights can cause the
>flash power to decrease unpredictably. This doesn't make a big
>difference, but it might partially explain why your test
>didn't show much brightness increase when you used two
>overlapping flashes.
>
>2) It's not usually a good idea to use use TTL-BL when on the
>SC-28 cord. The TTL-BL equations require that the distance
>from the subject to the camera equals the distance of the
>subject to the flash. Also, TTL-BL works best when the camera
>and flash are colocated. The background ambient must be the
>same for the flash as for the camera. Bright areas in the
>background (a window allowing outside light for instance) from
>the camera position will cause the flash power to increase to
>try to balance with it, but if the flash is not co-located
>with the camera and pointed in the same direction, its power
>may be increased drastically trying to balance the area that
>the camera sees.
>
>3) TTL on the SC-28 cord works normally, as though the flash
>were mounted on the camera.
>

Russ,

Thanks for your comment.

I noticed the specular reflection in the initial tests so in the second batch of the tests I tried to avoid them by arranging the camera-subject-flash angles. I originally shot just the wall and the results were similar.

In the tests, I changed the mode on the flash to TTL (no BL) when shooting with the SC-28 connection.

I will do some more tests to investigate this further.

Max

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Pinned topic New CLS Preflash Sequence Images [View all] , HBB Moderator Hal is an expert in several areas, including CLS Awarded for his excellent article contributions to the Resources. Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 , Thu 15-Jan-09 08:25 PM
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