Is this in focus?

[brenski]

Would someone be kind enough to have a look and tell me if this allsky image is focused correctly?
is it sharp enough?

Zwo 178mc

[admin]

Hi,

all sky cameras can be tricky to focus - if you are using a glass/plastic dome then the curvature means that it introduces some errors to the focus, so the image can look sharply in focus with the dome off and then be a bit blurry with the dome on. It may not be a case of 'is this in focus'?, but more 'is this the best focus I can achieve'?

cheers,

Robin

[brenski]

thanks @robin

I have been trying to adjust focus with the dome off, however, as soon as it looks correct and I re-tighten the lens screw, the next capture looks "out". and that's BEFORE i reapply the dome!

i heard there was a trick to adjust focus more precisely, by first adjusting the actual lens collar from the camera, taping it down and then applying fine adjustment to the lens itself.

is there a quick and easy guide to how to do this?

thanks

[admin]

Hi,

I don't have any tricks to share - I did mine by length trial and error Maybe other all sky users have some suggestions.

cheers,

Robin