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Old 19-01-2009, 01:54 PM
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Quark (Trevor)
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Quark is offline
Join Date: Apr 2008
Location: Broken Hill NSW Australia
Posts: 4,012
Further advice regards flats

Hi All,

Getting ready for a night of piggyback imaging with my 450D.
Will be using my 17-85mm EFS lens.

Have been experimenting this afternoon with the camera and lens at 85mm taking flats using a light box.

Brought up the histogram display on the 450D and with the lens focused at infinity at 85mm and camera with W/B set at daylight or 5200 K, an exposure of 1/400 sec has my histogram peak just over 1/3 of the way across from the left toward the right of the graph.

How does that exposure sound for my flats, would that be adequate.

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