Dithering Settings

[Bill.Richards]

I'm using PHD2 with a ZWO ASI120MM-S guide scope and camera (~6.5 arc-sec/pixel) to auto-guide my CEM40 mount.  I have a Canon EOS 6DII and normally use lenses in the 135-600 mm range (so 2-9 arc-sec/pixel).  I use BYE to control the imaging session.  I'd like to enable dithering but have a few NOOB questions:

1) If I'm using the 600 mm lens (2 arc-sec/pixel), will the default dithering settings be adequate or would I need to increase the aggressiveness? 

2) What if I'm using a 135mm lens (9 arc-sec/pixel)?  In that case, the guide scope will have a higher resolution than the camera.  Would I then need to use the multiplier parameter in PHD2 to increase the dithering even more?

[s3igell]

The default should work OK at 600mm.  But you will need to increase for the significantly wider 135mm end.

 

[Bill.Richards]

Thanks for replying - I'll give the default setting a shot and see how they work, and crank up the aggressiveness for the shorter focal lengths.