PHD2 & Image Scale & Binning

[BendGrampie]

Hi.

I've seen oblique references to this in other threads, but is there a general rule of thumb for when image scale is too small for PHD2 (either absolute or relative to imaging camera).

For example, I have OAG with scale .63 and imaging camera scale of .81.  What are the pros and cons of binning my OAG camera 2x2?

Thanks!

Marc

[bw_m...@earthlink.net]

We recommend keeping the guider image scale above 0.5 arc-sec/px in order to help the star-finding process.  In your case, I would bin the guide camera because you will probably benefit from higher SNR guide stars and you will pay no price in terms of guiding accuracy.  I have a similar situation with my gear and I bin the guide camera to achieve a 1.2 arc-sec/px scale while imaging at 0.6 arc-sec/px. 

 

Regards,

Bruce

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