John,

It looks like Ring Mask is what I'll be using. Does the blue circle adjust to give me a graphical representation of the sensor area it is regarding for autofocus?

My current relation ship with Field Flatteners: "Agree to Disagree" . . . it's not an optical disagreement, but a mechanical one. When I switched to Mono this winter, the shop I bought from sent a field flattener with the camera and filter wheel. The first problem was getting the 55mm backfocus - I had the wrong camera. So sent that one back to get the short backfocus version. Then that one had a color sensor installed . . . yay . . . so sent that one back. Finally got the 55mm backfocus and now the flattener wouldn't fit without ordering a custom adapter which probably couldn't be fabricated anyway to keep 55mm. So sent that flattener back and ordered the Explore Scientific flattener . . . which, you guessed, didn't fit without major mechanical acrobatics either . . . Around March timeframe, I'm watching the nights slip by and had some discussions with my club members and have decided to just move forward with the known issue and consciously work around it until the perfect field flattener comes along.

Anyone out there know of a flattener with simple 2" threads on the input and output side? Why one doesn't exist, I don't know or I haven't been able to find it.

My thinking at this point is to work the center 1/3 of the sensor and either crop or BlurX the corners. This camera also has the option in the INDI driver to crop the image at the sensor, so that is another option to avoid the corners.

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