Anyone have any information on field flatteners for achromats, visual only? No AP or NV or binoviewers, please. Just an eyepiece in a diagonal.
Here are a couple data points from my own experience to start the ball rolling:
- The TS2FF works great for visual on the C80ED. Just screw it onto the end of a 2" diagonal, insert the diagonal in the scope, put an eyepiece in the diagonal and start viewing. Sharp stars at edge of field and center of field! The image is getting close to something like a Petzval APO. (I said close, people, not exactly. No pouncing from the perfectionists.) My eyes no longer accommodate for focus, so I am a good judge of a flat field vs field curvature.
- The TS2FF does not improve the image in my ST120, at least not so far. I screwed the TS2FF onto the end of a Baader 2" Click-Lock mirror diagonal. I had replaced the original focuser with a GSO Crayford (not the low-profile one).
I have an ST120, 150 Omni XLT f/5, ST120 f/5 and Bresser AR-102xs 4.5 that need to have their fields flattened. Anyone have experience with something that works? And please keep explanations complete but simple. If something works - or didn't work - explain exactly how you set it up.
Edited by Sarkikos, 27 June 2019 - 04:05 PM.