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Globular Cluster M13

astrophotography catadioptric dslr dso Meade


Alen Koebel

Globular Cluster M13

This image was the first one I took through the telescope described below with a DSLR. Previously (over ten years ago!) I had attached only a 35mm film SLR to it. This "casual" image used no flats, darks or bias frames. However, I did dither (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 has no detectable 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: 7 minutes (14 x 30 seconds) @ ISO 1600. _Guider: Unguided. _Date: Sept 15, 2018. _Location: Near Bayfield, Ontario, Canada.

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