Quote:
Originally Posted by ChrisV
Wow Kevin, that's really nice. Now I know what the M83 I'm working on 'should look like'.
You say you use a UV/IR filter. Should I be using that for galaxies with a reflector and DSLR (or other OSC) ? Is it to tighten up stars ? I hadn't used one as I thought galaxies emitted into deep red/IR ??
And could someone explain what's wrong with the stars.
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Thanks Chris. An unmodified DSLR doesn't really need a UV/IR blocker, but a modified one may benefit. Though the benefits are mostly with refractors I think. I did take some frames with an IR >650nm filter, but were quite noisy so didn't use them.
The bright stars are a little bit egg shaped. It's curious that the dimmer ones are not, which is puzzling. Possible culprits are collimation, mirror slap, pinched mirror or star drift as the mount is unguided. I'll tackle them one by one and hope to get to the bottom of it eventually.