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Globular Cluster M13

astrophotography catadioptric dslr dso Meade


Alen Koebel

Globular Cluster M13

This "casual" image used no flats, darks or bias frames. However, I did use LENR and dithered (manually!) between every subexposure. The image is nearly the whole APS-C frame with only minor cropping due to the stacking. [Pixel peepers will notice what appears to be chromatic aberration. But the SN6 telescope, a Schmidt-Newtonian design has no appreciable CA. The color separation is always in the same direction, revealing its origin: atmospheric refraction. Hercules was very low in the sky when I shot this.]
_Imager: Pentax K-3II DSLR. _Scope: Meade LXD55 SN6 6-inch f/5 Schmidt-Newtonian OTA on a Vixen GP-DX with SkySensor 2000PC. _Exposure: 9 minutes (18 x 30s) @ ISO 1600. _Guider: Unguided. _Date: Sept 15, 2018. _Location: Near Bayfield, Ontario, Canada. _Sky Conditions: Bortle ~2.5, average transparency.

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