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Stephane,
Goto , framing and focus are excellent as this object is a tough one to attempt.The bright star Alnitak has a double diffraction spike on one side due to one plane of your spider vane slightly offset from centre. From my experiences with newts I’d say one screw on one side is screwed in too tight pulling the opposing vane upward slightly. When you get time you can test on a bright star and make tiny adjustments until it’s perfect. Before that have a visual look at the spider vanes to see if you can see an offset on one side. If your not confident, just leave it , the double spikes will only appear on the brighter stars ( if any ) in your images.Yours is not that bad I’ve seen worse.
Image is great for a first attempt but noisy.
Did you use calibration frames ? (At least darks )
How was your guiding ?
We’re conditions humid last night ? Your DSLR could have been running quite warm +25deg ( thermal noise ) which also adds noise
We’re seeing conditions good, nice and stable or poor ?
From the info I have , the Nikon D7000 when used for Astro has a sweet spot at ISO100 and ISO200 ( high dynamic range) What setting did you use ?
For a DSLR with short exposures and OSC NB filter, a great effort
Well done !!
Martin
Last edited by Startrek; 01-12-2021 at 08:11 AM.
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