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Old 22-11-2016, 03:39 AM
pixair (Tom)
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12"Newtoniam and ASI1600?

I'm thinking to buy ASI1600 for my 12" newtonian telescope. Will this combo be good match? I'm not worry about mount (ASA DDM) but image scale 0.67arcsec/pixel sounds way to much (I have average seeing 2.5"-3"). My main targets are galaxies and some narrowband (but only in Ha).
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Old 22-11-2016, 06:43 AM
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Atmos (Colin)
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For average seeing it may be a bit over the top, the camera doesn't bin on chip but you can always software bin without any issues as it doesn't take long to swamp read noise.

Something like the 16200 may be a better match with its 6 micron pixels. Greg Bradley likes his. Gets you to approx. 1"/pixel
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Old 22-11-2016, 08:49 AM
glend (Glen)
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Are you talking about an f4 or f5 12" Newt? The difference in focal length will have some impact. However, the camera is best suited to focal lengths below 1000mm, with <800mm better still. An 8" f4 newt would be fine i would think, but in saying that i have used the camera on my 10" f5 newt.
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Old 22-11-2016, 09:50 AM
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Atmos (Colin)
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Originally Posted by glend View Post
Are you talking about an f4 or f5 12" Newt? The difference in focal length will have some impact. However, the camera is best suited to focal lengths below 1000mm, with <800mm better still. An 8" f4 newt would be fine i would think, but in saying that i have used the camera on my 10" f5 newt.
He has a F/4 with a focal length of ~1170mm if he has calculated at 0.67"/pixel.
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Old 22-11-2016, 10:19 AM
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Originally Posted by pixair View Post
I'm thinking to buy ASI1600 for my 12" newtonian telescope. Will this combo be good match? I'm not worry about mount (ASA DDM) but image scale 0.67arcsec/pixel sounds way to much (I have average seeing 2.5"-3"). My main targets are galaxies and some narrowband (but only in Ha).
An image scale of 0.67 arcsec/pixel will be well sampled for seeing just under 2.5" (image scale * 3.5 is the magic number: http://www.stanmooreastro.com/pixel_size.htm)

I image at that scale with my Ceravolo 300 (same aperture as you) and it works well for galaxies but you do need reasonably long integration times. You'll need good guiding but I expect the DDM is capable of that.

The other thing you might want to consider is whether the ASI1600 will give you a FOV that's large enough for the narrowband nebula targets you want to go after.

Cheers,
Rick.
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Old 22-11-2016, 10:30 AM
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rustigsmed (Russell)
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The other thing you might want to consider is whether the ASI1600 will give you a FOV that's large enough for the narrowband nebula targets you want to go after.

Cheers,
Rick.
still a lot wider than the 694 chip!
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Old 22-11-2016, 10:39 AM
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still a lot wider than the 694 chip!
But not as big as my 16803
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Old 22-11-2016, 02:35 PM
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But not as big as my 16803
But also doesn't need such long exposures as your 16803
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Old 23-11-2016, 01:26 AM
pixair (Tom)
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My 12" Newtonian is equipped with Wynne corrector (1120mm FL) which will suit tiny (compared to 16803) pixels in ASI1600. My thinking is that thanks to short exposures (60-90s) I can minimalize seeing effect (and at the same time my small image scale). Of course I mean LRGB astrophotography. H-alpha is not my main target, but occasionally I would like to do some targets in this technic too. In this case I don't have a problem with small FOV as I like to do small part of nebulae.
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Old 23-11-2016, 10:49 AM
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Hi just experimenting last night with this camera on a galaxy using a 18 inch Newt. at F4.5 using bin 2x2. I personally don't like heaps of short exposures, trying to reduce my exposures to 4 minutes was a problem with stars and the galaxy core burnt out. I had reduced my gain to 35 but this was still a problem so obviously I have a lot to learn.
If you are after short exposures this may be your camera.
Clear skies Ken.
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Old 23-11-2016, 02:55 PM
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But also doesn't need such long exposures as your 16803
But you need more of them
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