Hi list,
I own a 30D and have a strange problem.
It seems there is dust on my sensor (or lens but I doubt that since
I have the problem with different lenses) but only when I'm using
long exposure. When t<1s theres no problem but if t>1s the image is
"dirty".
Also when I'm using studioflash (Elinchrom) the dirt (it looks like
a worm) is visible but using my EX380 there is no problem.
I wonder how this is possible.
Tnx for your help in advance.
Marc
I think you might check the EXIF data to see which apertures you
used. A lot of dust specks are not really noticeable if you use a
lens wide open, but since the dust resides on a surface a ways in
front of the actual sensor, small apertures (leading to a large depth
of focus) will show that dust.
With a large and powerful studio flash I'm sure you're using smaller
apertures than with the 380, and when your camera is on a tripod
you'll tend to stop down as there is no shutter speed (shake) penalty.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
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|[ ]| http://www.archiphoto.com
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