A quick snap of Caldwell 4, The Iris Nebula

Whilst the 80ED was working ok M27 last night, I had a bit of a play with the Photoline 72 and ASI174MM. This is 75 minutes of 300 second subs. No filters as I only have one set, but I did take darks for this one. What’s intriguing me is the apparent diffraction spike on a single star to the bottom left. I haven’t worked that one out at all yet.

I have the TSRED 279(?) reducer/flattener for this OTA, and I think ideally it needs it. The frame is slightly cropped to remove the edge artefacts from stacking, but the stars close to the edge definitely look a little stretched to me.

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