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Thanks for comments everyone.
You are correct Mike in that the Astrobin site only allows the selection of one date per filter so I tend to just put in the date of the most recent frame downloaded. The actual elapsed time in this case was from September 2024 through to January 2025 (I was surprised too when I looked at this). I do try to get onto new objects early on in their apparition to try and make sure to get enough data before the season for the object ends, even if it means starting the acquisition project at 1am.
Thanks for the feedback on the lens Greg. This lens has been kind to me with the ASI6200 camera though it did take some time and effort to dial in the tilt adjustment. I step down the lens to about f5 as well to alleviate aberrations around the edge of the field.
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