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Observing >> Variable Star Observing and Radio Astronomy

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gavinm
Carpal Tunnel


Reged: 08/26/05

Loc: Auckland New Zealand
Re: AGB Camera new [Re: Hubert]
      #5971371 - 07/14/13 10:53 PM

As mentioned above, I've never had a problem with the small FOV of the ST7 at f6.7. Larger would be nice, but I'd choose more sensitivity of the NABG over a larger FOV any day.

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Hubert
sage


Reged: 09/26/06

Loc: Belgium
Re: AGB Camera new [Re: gavinm]
      #5971911 - 07/15/13 09:47 AM

Hello Gavin, you are right.

And I always can sell my C9.25 and buy a 10" newton f4 which gives me a bigger FOV.


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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: AGB Camera new [Re: Hubert]
      #5974123 - 07/16/13 01:12 PM

Here is what to do: figure the FOV for your optical path and the CCD. Go the the AAVSO and download some CCD charts scaled to that FOV. If you find you have enough comp stars in that FOV then you are good to go. For example: I image at F4 with the 402ME. My FOV is 30'x21' which is great for my program of Miras and eclipsing binaries and fine for asteroids.

But, nothing wrong with larger FOV and ABG cameras so long as you figure linearity and stay linear.

Ed


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