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Humayan,
Thanks for that explanation. All my shots (flat, light, dark, BIAS) are ISO 800. My flat shots were between 1/20 sec - 1/30 sec thru a tee shirt at dusk. So if I understand it correctly a flat dark is the same duration dark frame (say 1/25th sec). So take 20 or so off these (I don't touch my rig - all the gear is firmly attached). So tonight I'll take these frames and send the lot to you and be very interested to see what you can do with it!
Cheers,
Matthew
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