Thank you for posting your image and the spot diagrams compared against FSQ.
Based on your image of the Leo triplet, I would say the star sharpness is very fine. This is especially true given that the pixels in your image are just 3.7 um (vs. 5 to 6 um commonly seen in FF cameras). However, this just does not match what's in its spot diagrams. If I just look at the spot diagrams, I would consider this a horrible astrograph. Spot sizes of 20 (red) to over 30 um (blue) would translate to 6 to 8 pixels in your aberration inspection image, but I just don't see that. The size of faint stars in your image appears to be more like 5 to 6 pixels, rather than 6 to 8, and this includes seeing effects and all the other possible real-world imperfections.
I just can't reconcile these. All spot diagrams from ASKAR and Sharpstar look like this, unreasonably bad and scary when compared to similar products from other manufactures (not necessarily TAK). However, when look at their pictures, I don't generally get this kind of bad impressions. Many of them look just fine. Do you have any explanation to this? I am very puzzled.
Edited by whwang, 08 March 2021 - 04:42 AM.