[rat156]

Hi All,

Hoping that someone can help me.

I'm in the process of commissioning my new observatory, one step at a time, last night was checkiing out the camera and mount setup.

Scope is an ED80, camera Sbig Aluma CCD with Antlia 3 nm HA SII and OIII filters.

Pointed scope at Alnitak region.

Massive diffraction pattern around Alnitak. See attached.

Also a problem with polar alignment and mount counterweights (forgot to balance the mount!) resulting in streaking vertically. Mount is only roughly polar aligned, but set it up yesterday and poited at the Sun and very close to centre without any other work, so it's close.

Back to the diffraction pattern, any ideas?

Cheers
Stu