Quote:
Originally Posted by Andy01
Thanks to my ASV mate Clive  We managed to better collimate the beast with his Tak microscope.
It needed a couple of tweaks to the secondary - and it's certainly an improvement!
This is a test on the Gem Cluster - around 3 hrs of 3nm Ha.
I played with the spacers I have and 5mm was bad, 6mm was pretty good (seen below) but maybe it needs 7mm?
Now we're also wondering if the Stellarvue SFFR-70APO flattener/reducer is right to use with the RC8?
It's designed to be used with the SV70T which is only 420 mm FL, the RC8 is 1625mm FL. - Hmmm... 
Anyway - it's still not 100% but it's getting there!
There's also a generic starfield (60sec Lum) and a couple of images of Sirius in and out of focus either side - and also way out of focus to see the donut. |
Your primary is still off , if you look at at fainter stars , their rings are slightly pinched on one side you need to adjust the primary till they all look evenly round , the adjustment will be very small increments.