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Hi
fl of my 10 inch scope is 1400mm.
Yes thats right, converting to 16 bit tiff preserves all the information. Iris does the conversion linear, and does a damm good job with the dark subtraction, as one draws a small rectangle in an area of no stars in the light image, Iris then uses this to "optomise" the dark so that if the dark frame length is not the same as the light frame, or taken at a different temperature, it still subtracts the noise effectively. Down side is colour balance isnt automatic, it has to be set manually and is by trial and error till I get the right colour.
Scott
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