10-27-2015, 05:28 PM
Light pollution might be the biggest problem, as it is for me. There are some filters that can help a lot, but are no substitute for going somewhere really dark.
What rotation? If you mean Jupiter, look up winjupos software. If you mean the rotation of the stars in the sky, yes, software can re-align shots for the stars, but you have the problem that the field of view covered will change through the series. You can get away with shorter durations depending on the focal length and pixel size, to prevent star trails. For free stacking software, I believe DeepSkyStacker is popular but I never really got to grips with it myself, and I use some commercial software instead.
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For example, attached is what I think was "Comet C/2011 L4 PanSTARRS" taken in 2013. I didn't write it down then, but it was the significantly visible one that year. The comet is the lower bright object, and the andromeda galaxy is the upper object. This was taken on a fixed tripod about 5 minutes walk from my house. Looking at the raw files, I appear to have use Canon 600D, 135mm at f/2. Exposure 5 seconds, ISO3200. A light pollution filter was fitted. Even at 5 seconds, the stars were clearly trailing by several pixels when viewed 100%. With hindsight, maybe I could or should have gone even shorter. That was a stack of 50 shots. No, it isn't a great shot, but you can get something even with basic kit like this. If I had used a tracking mount, I could really increase the exposures and pull out more detail. This was not possible since my other kit was too heavy to move easily, and I didn't have line of sight from my house due to its low position in the sky.
What rotation? If you mean Jupiter, look up winjupos software. If you mean the rotation of the stars in the sky, yes, software can re-align shots for the stars, but you have the problem that the field of view covered will change through the series. You can get away with shorter durations depending on the focal length and pixel size, to prevent star trails. For free stacking software, I believe DeepSkyStacker is popular but I never really got to grips with it myself, and I use some commercial software instead.
[ATTACHMENT NOT FOUND]
For example, attached is what I think was "Comet C/2011 L4 PanSTARRS" taken in 2013. I didn't write it down then, but it was the significantly visible one that year. The comet is the lower bright object, and the andromeda galaxy is the upper object. This was taken on a fixed tripod about 5 minutes walk from my house. Looking at the raw files, I appear to have use Canon 600D, 135mm at f/2. Exposure 5 seconds, ISO3200. A light pollution filter was fitted. Even at 5 seconds, the stars were clearly trailing by several pixels when viewed 100%. With hindsight, maybe I could or should have gone even shorter. That was a stack of 50 shots. No, it isn't a great shot, but you can get something even with basic kit like this. If I had used a tracking mount, I could really increase the exposures and pull out more detail. This was not possible since my other kit was too heavy to move easily, and I didn't have line of sight from my house due to its low position in the sky.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.