On my Meade 10" f/10 ACF there is some curvature of field and if I recall there is about 20mm dia of very good area. Out past 30mm things go bad and then there is vignetting because the standard 2" accessories are too small. I have a post with measurements on my Meade 16" ACF which has a substantially flatter field. This link has the results for the larger scope:
I think that the radius of the field curvature scales roughly with the focal length for this data for for the 10" f/10 that would be smaller by (100/160) = 0.625, so just scale the X axis by 0.625.
The vignetting is limited by the adapter and in this case I was using the Orion thin off axis guider and a Canon 6D DSLR.
Edited by 555aaa, 09 March 2018 - 10:02 AM.