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Old 24-02-2012, 05:38 PM
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lepton3 (Ivan)
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Imaging Mars and Saturn - how long to record?

I'm wondering what is the opinion on how long to record video for each channel when using a mono camera and LRGB filters, for Mars and Saturn right now.

Obviously, the longer the better for noise reduction, but too long and you'd need to de-rotate before combining the channels.

At the moment I'm using 2 minutes each R, G, B at 30fps on Mars. Could I go longer? I get onion rings if I do 60 fps with the DMK21AU04.

On Saturn, I'm doing L for 2 mins at 30fps and R, G, B each for 2 mins at 15 fps (can't get enough light through the C11 to do 15 fps with filters).

Suggestions?

-Ivan
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Old 25-02-2012, 10:03 AM
deon jeffery
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hello out there, im new to this site and to astrophotography i get out and take pictures when ever i get the chance so coming up and over the next few months will be mars and saturn,so any kind of info or techniques on these two would be much appreciated.eq6 pro-c9.25-canon 40d and orion starshoot 80 autoguider. Deon.
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Old 27-02-2012, 10:56 AM
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Ivan, all this really depends on focal length employed. By way of example I use 90 seconds per channel on Mars at 12700mm focal length. That gets me roughly 4300 frames in red, 3200 in green and 2800 in blue. If I used a smaller focal length I would only need to go around 60 seconds per channel to get similar results. However using the largest focal length v the amount of frames required is the question you need to answer.

With Saturn the issue is more prominent. I am using the same focal length at present and going 2 minutes for red, 3 minutes for green and 3.5 minutes for blue. This gives me a large image scale to start with, that gives good detail on the rings but blurs out detail on the planet. For better detail on the planet I need to use a much shorter focal length to gain as many frames in a shorter time frame. It is a choice related issue and when seeing is not great I choose to go for ring detail.

Now to more directly answer your question, you can go 4 minutes at modest focal lengths in each channel on RGB for Mars. Its day is slightly longer than ours so it rotates slower. At very high focal lengths up near 18 meters this time would need to be a bit shorter to accommodate rotational blue. You would need to do the Mars to work that out though.

Saturn though, does require shorter runs to capture spots etc ont he surface. 2 minutes for all colours in RGB would seem to be the maximum. That means adjustment to focal length and getting that down near 6-7 meters will give sufficient size and frame rates to get frames for smooth images.

Remember this is just like any photography, the available light determines the exposure, the faster the exposure the less blurring that can occur.
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