Scorpion Cluster NGC6231

[2020BC]

LXD-75 SN-8 MPCC 14x30secs ISO1600 guided

1:1 crop is on the left.

[Lester]

Nice image Bill,

those SN scopes are real performers.

[[1ponders]]

You know I've often thought about getting a 10" SN Bill. You've just about got me convinced. :thumbsup:

Any back focus issues with the canon? Any need for field flatteners or does the corrector plate do the job well?

[2020BC]

Cheers folks. The SN-8 goes alright. If you buy one you MUST get a new focuser. The rack and pinion is a shocker. It's a real pain to focus at f/4. It causes me a lot of grief. A good crayford with 10:1 microfocuser would be a dream. The design of the SN reduces coma, so it is less than for a standard newtonian of the same focal length. Noticeable coma still exists at the edge of frame. I'm experimenting with an MPCC Coma corrector which seems to do the trick.

With a 10% SN I wouldn't mount it on an LXD-75. I feel a 10" would require an Atlas (EQ-6) or better if you're also mounting a guidescope. There's a smidgeon (about 1cm, maybe less) of in-focus left when you put a Canon camera at prime-focus. Always enough room to add filters, etc. and stay in focus, but there's not enough room to insert an off-axis guider.

Hope this helps.

[Ric]

A great looking image Bill, lots of colours in the stars and nice and sharp.

We dont see enough cluster images so its always good to see a post.

Cheers