Chromatic Abberation?

[ChristopherCoy]

I bought my first roll of seamless paper yesterday, and set it up very quickly in the garage a little while ago. I'm using an AB1600 on 1/2 power to camera left as my main, and an AB800 1/2 power as fill to camera right.

These were both shot at ISO160, f16, and 1/250th.

My question is... whats the black line, or black fading on the right of the portrait, or bottom of the landscape? Is this a form of chromatic abberation, or is this the beginning (or end) of the shutter curtain due to sync speed?

[ldelacruz]

Did you try a slower shutter? 1/250 seems a bit fast!

[ChristopherCoy]

mmm...nope. But I'll go do that in a minute.

[CaptainTom]

Nikon sync speed is 200 ????

[dmcantrell]

I'll bet it's the shutter. I typically do studio work at 1/125.

[dmcantrell]

Originally Posted by CaptainTom

Nikon sync speed is 200 ????

The D90 has a 1/200 sync speed, but other models have faster sync speeds.

(according to nikonusa.com)

[CaptainTom]

keep in mind that with flash your shutter speed only affects the amount of ambient light in the image, and not the exposure.
The exposure is a result of the amount of the flash (flash duration) and the aperture.
Take a test of shooting something with the flash at the same power, but using different shutter speeds (up to and then past the max. synch speed for your camera).

[ChristopherCoy]

Its the shutter speed. 1/125th works a lot better.