April 20, 2010

M13, 190MN, 2x PowerMate, TS OAG :)

I imaged this one on Satudary night at SGL5, its an hours worth of 5 minute images. I took 2.5 hours worth, but M13 was still down “in the murk” at the start and the image quality was quite bad at that altitude. The guiding also suffered that low down, but it improved quickly as it got higher in the sky.

A couple of new bits of kit involved in this image. First was the inclusion of a Teleskop Service 9mm Off Axis Guider, which took 3.5 daylight hours to get parfocal with the imaging CCD, but well worth the time spent.

The other bit in this image was the use of a Televuew 2″ 2x PowerMate, which takes the 190 MakNewt from f/5.3 to f/10.6… slower but the same field of view as a C8.

I`m very happy with the performance of the 190MN under abnormal conditions, I am sure that the OAG had a large part in getting such fantastic subs. You would have thought that such a long tube OTA would have really moved around, and adding the powermate would have just made things worse, but I have included an image of the 2x drizzle cropped center of M13 to show just how round most of the stars are.

Mount: EQ6 via EQMOD
OTA: Skywatcher 190 MakNewt @ f/10.6 (Televue 2″ 2x PowerMate)
Guiding: TS OAG + Starlight Xpress Lodestar
Imaging: Starlight Xpress M25C + MaximDL, 12x300s, Hutech IDAS LPR (101  bias, 101 flats)
Orchestrated: CDD Commander
Stacked: DeepSkyStacker

(Click on image for larger version)

and here is the 2xdrizzle cropped centre…

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