[glend (Glen)]

I wanted to show the benefit that DSLR cold finger sensor cooling provides in image processing - specifically the ability to remove the influence of Dark Noise associated with the CMOS sensor. I have attached two recent files, actually from last night, both shot with the sensor holding at -10C. The first one is a 1/4000" bias offset frame shot at -10C, and second one a 194" dark shot at -10C; both shot in RAW but converted to jpg for resize for the forum. I have carefully examined the RAW files in Photoshop and cannot detect any significant difference. Click on them and examine them, you will be hard pressed to see much difference. Cooling works. Can you tell them apart? The left one is the bias offset frame and the right is the 194" dark. I can tell you that it doesn't matter if the dark sub is 330" the result is the same when the sensor temp is held at -10C.