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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 image is better than the best photo I ever took of M13 on film with far less exposure time. Of course, this object like most benefits from MUCH more integration. But it's neat to see just how much a DSLR can get in only a few minutes. Note that this "casual" image used no flats, darks or bias frames. However, I did dither (manually!) between _every_ exposure. 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. Note that the color separation is always in the same direction, which is a clue to what it really is: 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: Huron Church Camp, ~4km south of Bayfield, Ontario, Canada.

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