A nice little galaxy group in Canes Venatici

This picture was taken arbitrarily in Canes, looking for a test object to verify the corrections I did to the optical train. In the previous image (M3) I noticed some tilted focal plane. That was due to an extension ring which was not tightened enough. The main galaxy here is NGC5353

Globular cluster M3 in Canes Venatici

Further tuning & testing my setup, I used some clear sky to image this globular cluster in Canes Venatici. 31x180s on ISO800 with the regular setup: C11 D750 Optolong, ASI174MM

I tried out an alternative way to collimate before imaging, by attaching the ASI camera on a Nikon T-Ring adapter. This way the whole image train is kept in place and only the camera’s are switching.

It did not work out as expected, so have to find a way to collimate using the Nikon instead. Challenging!

Anyhow as a result the full frame image was not flat / in focus so I needed to drop this image. The size was reduced to 70% with a pixelscale of 0,8″ per pixel and field diameter of 20′

This globular is at a distance of 34.000 light years and contains approximately half a million stars (I expected more to be honest). Surprisingly it moves towards us at a speed of 147 km/s. 5source: messier-objects.com)

(click on the image for a larger version)