Binning question

[bottletopburly]

Using my 200pds with a zwo533mc is it better to bin 2x2 at 1.55 pix or 1x1 at 0.78 px ,I have Been binning  2x2  in the he first few times I’ve used the camera .

 

Dave 

[vlaiv]

At 0.78"/px you are guaranteed to be oversampling. 1.55"/px is much more realistic sampling rate.

You can easily test what sort of sampling rate is good for a given image if you examine single frame and star FWHM in arc seconds. Measure average FWHM of average frame (or you can do it on final stack as well) and divide that value with 1.6. That is sampling rate you want to aim towards.

[bottletopburly]

2 minutes ago, vlaiv said:

At 0.78"/px you are guaranteed to be oversampling. 1.55"/px is much more realistic sampling rate.

You can easily test what sort of sampling rate is good for a given image if you examine single frame and star FWHM in arc seconds. Measure average FWHM of average frame (or you can do it on final stack as well) and divide that value with 1.6. That is sampling rate you want to aim towards.

Thanks vlaiv