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Old 23-01-2015, 01:13 AM
Ramsees (Ronny Kaplanian)
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Starlight xpress SXVR-M25C with Hyperstar Celestron 9.25

Hi Folks,

I am now the proud owner of the Hyperstar system on my CPC Celestron 9.25c Hd edge which means I can image at F 2.8, in saying this will my camera above be ok with the wide field imaging as I thought the smaller the pixel the better with wide field or am I wrong becuase I don't understand the thing about pixel sizes to focal length ratios . Any help will be appreciated
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Old 23-01-2015, 07:10 AM
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You got it right.

Greg.
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Old 23-01-2015, 09:12 AM
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Camelopardalis (Dunk)
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Even better, your C9.25 is f/2.3 with Hyperstar
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Old 23-01-2015, 11:27 AM
Ramsees (Ronny Kaplanian)
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Ok, thanks for this. little confused. I thought the smaller the pixel the better because I obtain more information and then I can zoom into the object a little to see the detail but if the pixels were big does this not create a pixelated image ??
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Old 23-01-2015, 12:48 PM
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Yes - the bigger pixels will mean that you will be somewhat limited in how much detail you will see (although ultimately this will also be determined by how good the seeing is), but the up-side is that the big pixels will be sensitive and your scope is (very) "fast" (focal ratio) so will gather data quickly.
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Old 23-01-2015, 07:16 PM
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Quote:
Originally Posted by Ramsees View Post
Ok, thanks for this. little confused. I thought the smaller the pixel the better because I obtain more information and then I can zoom into the object a little to see the detail but if the pixels were big does this not create a pixelated image ??
Small pixels tends to mean more noise than large pixels. Large pixels get more light as they have a larger surface area so the signal to noise ratio tends to be higher if the read noise from the chip is reasonable.

As CCDs develop the read noise seems to be getting quite small (Sony CCDs for example seem to have about 1/3 the read noise of many Kodak chips). So the smaller pixels may still work on long focal length scopes as a result.

Greg.
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Old 24-01-2015, 01:38 AM
Ramsees (Ronny Kaplanian)
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Thanks guys, makes sense now. Much appreciated
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Old 24-01-2015, 06:15 AM
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Logieberra (Logan)
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Have you considered the new 4120EX from Atik. 12MP. Colour. Made for Hyperstar users.

http://www.atik-cameras.com/news/new-cameras/

http://www.atik-cameras.com/product/atik-4120ex/
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Old 24-01-2015, 10:25 PM
Ramsees (Ronny Kaplanian)
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Look pretty nice, these Cameras are great but how much are they ? will check on these from Bintel or Andrews Communication. thanks for sharing
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Old 24-01-2015, 10:51 PM
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3K USD or there abouts (http://www.optcorp.com/atik-4120ex-c...cd-camera.html). Don or Michael at Bintel are good with the Atik stuff. Cheers
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