Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5272
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M3, hydrofluoric
M3
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M3

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M3, hydrofluoric
M3
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M3

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Description

With a short window of clear skies forecast I intended checking collimation,guiding and oag settings for my SCT which had not gone well on a previous recent attempt . On this occasion all went to plan so pointed the scope at M3 for a test. All looked good and got 93x 120s subs which looked ok when stretched however would not calibrate and stack in PI WBBP ,DSS or Astroart either with or without calibration files. I normally use unity gain and offset 50 with my ASI2600 but looks like offset 0 was set inadvertently. As this was the first deep sky image since last June was desperate to get some return for staying up all night and found Astap saved the day albeit without dark frames so although not my best effort at least an image to post.

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M3, hydrofluoric