10 Inch TS Optics Ritchey-Chretien Review and 2nd Light on M51

[powerlord]

is this 'telescope alignment evaluation image' a 'thing' ? if so - what is it ?

[City9Town0]

James Webb!

[powerlord]

ah sorry. didn't get it at first.

ha - now we just wait for @vlaiv to point out the dodgy looking star nasa has on one of the corners 🤣

[Catanonia]

3 hours ago, powerlord said:

is this 'telescope alignment evaluation image' a 'thing' ? if so - what is it ?

Sorry could not resist.

on plus side I tnig I have tweaked my own scope. Stars certainly look better.

[Catanonia]

Ok here is a 2min sub at bin 2x with phd rms of about 0.6

I defocused a star in the centre of the frame, tweaked the secondary until good cantered doughnut. Tried video but atmosphere made it very difficult, but when I could see it looked good. 

• Then I move star to corners and same test. Tweaked primary to get central doughnut
• Then repeated process centre, corners etc
• Then set focus to prime focus for imaging, took bright star and checked vanes ‘ spikes in centre and corners. All looked good.

 

Edited March 16, 2022 by Catanonia