Quote:
Originally Posted by rogerg
Dennis,
I have tried similar comparisons myself now and then. Always found it very hard to accurately compare, because processing and viewing makes such a difference. My attempts have been with galaxies and less obvious than yours here with this PN.
There's no doubt your 10min subs one is better. Over sharpened? Unsure, perhaps slightly, but it's not "awfully over sharpened". You've got the object very well defined in that image.
Interesting comparison  |
Hi Roger
Yes – it is a time consuming process to do these comparisons but I am finally investing some time to understand and tune my mount’s auto guiding capability, as using a side-by-side guide scope works okay up to around 1200mm fl but as soon as I get over 1500mm I get star trails on even 3 minute subs.
I removed the guide rings and bolted the WO 66mm guide scope to the mounting plate and it improved the auto guiding and just using the ST7 with dual chips has improved it even further, so it looks like flexure was a key component even though I was using WO dovetail saddles.
Cheers
Dennis