Just wondering, how important is optics quality in guiding using relatively small pixels and PHd2 to get sub 1/50th of a pixel in guiding. Granted I'm not talking about APO's or maybe even doublets. But to really get a very good snr and a very tight center centroid, are excellent optics needed to get there? Is it necessary and or does it improve guiding enough to justify the cost? Also let me preface that in my case, I have Bortle 3 sky's with no light pollution to speak of and generally only image when the seeing is very good.
Just wonderg if I can improve on .12rms guiding, on good nights. I know a mount is also a limiting factor, but I have my mount working very good and I am still using a modified 50mm finderscope with my ZWO120mm and it all works very good. But, can it be better with better optics?
p.s. I read Dr. Starks article on 1/50th pixel guiding. This is what got me thinking.