[Aavso-photometry] In defense of the ST-9 & CCD choice Considerations

[Michael Koppelman]

(Mike cleared this up while I was writing this, too, it seems...)

It looks like what they are saying is:

"A good rule of thumb to avoid undersampling is to divide your seeing  
in half and choose a pixel size that provides that amount of sky  
coverage. For example, if your seeing conditions are generally 4  
arcseconds, you should achieve a sky coverage of 2 arcseconds per  
pixel. If your seeing conditions are often 1 arcsecond, you'll want a  
pixel size that yields 0.5 arcseconds per pixel."

This seems to be just the Rayleigh criterion and is probably not  
horrible advice.

http://en.wikipedia.org/wiki/Rayleigh_criterion

M.


On Jun 12, 2007, at 11:03 AM, Michael Newberry wrote:

> If CCDU makes such statements, then I would kindly suggest that  
> Apogee's
> website is not giving the best advice. To my knowledge, no one at  
> Apogee is
> an astronomer. Arne and I (and others) have "been there and done  
> that" for a
> lot of years. Take Arne's advice!
>
> Michael Newberry