hi slawomir and thanks for a reply
usually i cannot get more than a couple of minutes from my dslr at iso 800 or 1000 before sturation on histogram, however just testing my ccd the histo doesnt seem to move hardly at all to the right even after 5 or 6 minutes!
i have been reading a bit about the offset and gain but i do not know wether or not it will make any difference
pat
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