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Showing results for tags 'dark frame'.
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Hello girls and guys, just out of curiosity i tried to get a grip on the noise of my new used QHY8. I'm sharing a 30 sec sub with a low gain setting that would somehow translate into ISO 100-400 with a Canon (roughly): The frame is completely pitch black, even with heavy stretching! With the only notable exception being 4 hot pixels (all of them green). I stretched it 3 times in Gimp with no visible noise. I guess as long as the Gain is kept so low, i even might ignore the darks completely (?). I will try my first DSO's ASAWA(as soon as weather allows), process them with and without darks, and will share the result here. Dark skies!
I have been reading the PHD2 manual and have noted the statement: "The settings for 'Use Dark Library' and 'Use Bad-pixel Map' are mutually exclusive - you can use one or neither, but not both at the same time". So, in order not to reinvent the wheel, a question for those of you who use PHD2. Which, if either, do you find works best? Or. if it isn't that simple (and when is it ever?), what are the main things I should consider in making the decision? Thanks.
Hi all, first off, very sorry for this incredibly basic question, I am very new to this DSO imaging game . So, I am waiting on a suitable mount to get into this properly, but I am keen to practise with my 80mm refractor on the Nexstar mount; so short exposures only at the moment. Last night I had a play with getting some images of M82, and I could very easily see the galaxy on the screen with a 5 second exposure and the gain set high (obviously not good for imagining). So, taking 10 second exposure is giving me some images which I am happy, with, so next step is to work out how to stack, but reading making every photo count, I need to take some Dark & Bias frames first (when I have got all three types I will try to work out how to use DSS). So tonight my imaging will be very basic, I will probably take 40 Luminance shots at 1x1 and 15 RGB shots at 2 x 2; all shots with just10 second exposures. From reading the book, I think I understand Dark frames and basically I have to take these at the same time as the proper photos, using the same gain / exposure / focus settings, but with the end cap screwed on the scope (will ten shots be enough?). The Bias frames do not need to be taken at the same time (?), but do the settings need to be similar in terms of Gain? The books states that the exposure time does not matter, but I am already on a short exposure, so how will this be different from the Dark shots. Any quick answers would be good as I am hoping to be out in a field in 3 hours time , Cheers, Dave