Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4278  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  Whirlpool galaxy
M 51 Whirlpool Galaxy, Michael Timm
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M 51 Whirlpool Galaxy

M 51 Whirlpool Galaxy, Michael Timm
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M 51 Whirlpool Galaxy

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Description

My first light with the CCDT67. Something went wrong with the reducer (stars had a long shape), but i tried to eliminate the problem in the stacking process. Later this evening (after i dis- and reassembled the setup) the problem was gone. Dont know what it was, but hopefully it wont come back. And i forgot to take flats. Man.

Edit: Hm, pixel scale tells me that i reduced by about 0.5. How could this happen? I was pretty sure i checked the distance between CCD and reducer twice. Maybe i was wrong. I will measure the distance tomorrow again.

Edit next day: Yes, the distance is too big. I am between 9 and 10 cm, that is out of the sweet spot of the reducer. I will buy a shorter adapter.

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M 51 Whirlpool Galaxy, Michael Timm