IC 4628 or Prawn Nebula in RGB

[avandonk]

This is really a test to see how well the camera is aligned. The top left and bottom right corners are about as good as it gets. The top right and bottom left corners tells me the camera has to be moved up a tad and to the right a tad. The movement in both cases needed is less than 0.1 mm about 0.06 mm or 60 micron. Without the ITS this would be impossible! It could also be a case of why bother.

Exposures. 18x4 min red,16x4min green and 6x4 min blue. As usual cloud stopped data collection.

Full res image here 8MB

http://d1355990.i49.quadrahosting.com.au/2013_06/IC4628_RGB.jpg


Bert

[alpal]

Good picture.
Only the bottom right hand corner & of course the center looks perfect to me.

[avandonk]

Here is a crop of the area within the 42mm diameter fully corrected area of the RH200.

http://d1355990.i49.quadrahosting.com.au/2013_06/42mmdiag.jpg


The sensor of the PL16803 camera has a 52mm diagonal which is way bigger than the fully corrected field of the RH200.

This is the field of a 35mm frame sensor

http://d1355990.i49.quadrahosting.com.au/2013_06/35mmframe.jpg


As can be seen by these crops I am pushing the optic way beyond its design limits.


Bert