Esprit 120 on the way!

[raymo]

I'd love to have a JPG as unsharp as that Lewis.
raymo

[Slawomir (Suavi)]

Originally Posted by codemonkey

I'm still not sold on the refocus thing yet. I'll do another run, this time without screwing up my guiding, and see how it goes. I've never had to do it on another scope, and yes, I've monitored FWHM over runs.

Hi Lee,

You could compare focus visually with a Bahtinov mask on a bright star at the beginning and at the end of imaging session on a night when temperature will change at least a few degrees, if you wanted to know for sure

[codemonkey (Lee)]

Originally Posted by Slawomir

Hi Lee,

You could compare focus visually with a Bahtinov mask on a bright star at the beginning and at the end of imaging session on a night when temperature will change at least a few degrees, if you wanted to know for sure

Good thinking, thanks mate. I thought of this, as I usually do, after I'd already packed up and was on my way back to the house. I should also take note of the focuser position to reduce the likelihood of focus slip being the cause.