Flash help

Soldato
Joined
18 Oct 2002
Posts
2,858
Location
watchin scrubs.
Hi

I sometimes get a black shadow across the bottom of my piccys when using my flash gun mounted on the camera, see below for example, and i have no idea why, or how to correct it whilst shooting :o:confused::(

DSC_8913.jpg
 
Well when I have a flash attached or the ST-E2 it won't let me take the shutter speed to higher than 1/250 and I've never had any problems :)
 
It varies depending on the camera. Going by the EXIF, the OP has a D90, the max sync speed on a D90 is 1/200.
 
Just tested my D90 1/250, it is :) ... shoots perfect at that speed, any faster the shadow is back.

Thx again.
 
Well when I have a flash attached or the ST-E2 it won't let me take the shutter speed to higher than 1/250 and I've never had any problems :)

It will if you turn on high-speed sync (h/lightning button)

It varies depending on the camera. Going by the EXIF, the OP has a D90, the max sync speed on a D90 is 1/200.

Yup, it varies for different cameras. My 5dmkII can go up to 1/8000 no problem.
 
Yup, it varies for different cameras. My 5dmkII can go up to 1/8000 no problem.
The flash sync speed of the 5DII is 1/200. It can go faster than that, but I very much doubt it will go anywhere near 1/8000 with a speedlite, which is what the OP is talking about. That is, after all, the maximum shutter speed possible. Using other set ups with some pocketwizards and something that will give you a longer flash will allow it to go higher.
 
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At slower shutter speeds the whole frame is exposed at the same time, at faster speeds the first and second shutter curtains travel at the same time so that only a small slit travels across the frame.

At the normal max sync speed the flash fires one pulse of light which won't be long enough to light the entire frame at higher than max sync speeds.

Some flash models have a mode called high speed sync which allows the use of higher shutter speeds than the camera's max sync speed. During this mode the flash fires several pulses of light for the entire duration of the exposure. This means that the entire frame is exposed to the light from the flash, rather than part of it.
 
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