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Help with Optics
Hi everyone,
I was wondering if I could get an opinion on the optics of my North Group ED80 Triplet. I purchased it about 6 months ago with the intention of getting into astrophotography and for the most part has been sitting there unused whilst I slowly built my kit around it. Well the last few weeks I finally got around to using and took a few pics through it, and I'd have to say I'm unsure if it's up to scratch or not.
Now I understand that being a fast scope it's a given that there'd be colour if it's a doublet, but a triplet?
I'v attached below a cropped area highlighting what looks to me like halo's around stars. I used a focus mask and it's a 30s exposure at iso800.
My gut feeling is that I'v got a lemon and I'v let the supplier know but as yet have not got a reply. Should I just cut my losses, stop being a tight git and buy something tried and tested?
Any advice on what I should do would be much appreciated.
Thanks!
Chris
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