AstroPhotography - stacked exposures
Right, so I understand the principle of stacking multiple images of astro shots, but do I stack a number of correctly exposed shots. Or do I take a load of shots that are almost pitch black and they become a single correctly exposed shot. My simple mind seems to think it's the former and of course correctly exposed could mean stacking different exposure timed "subs" to get the whole thing correctly exposed.
Last night for instance I took a few shots at 1/60th, a few at 10 seconds and some more at 30 seconds. The ones at 1/60 were almost all black, the ones at 10 and 30 seconds contained quite a lot of detail. All of this was just a test of whether the tracking was sufficiently accurate to not need guiding, I appreciate that it wasnt a definitive test as I only tried a 50mm lens, but I was also testing my remote application would allow me to control the camera from the living room.
I have an EQ5 mount with RA and DEC motors, I didnt mount my scope just the camera and a lens for this test, but the results got me wondering what is the correct procedure regarding stacking the resultant images.
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