Orion Field Flattener for Skywatcher ED80 and SW120 Refractors
I have been using an Orion Field Flattener for Short Refractors ( 400mm – 650mm) on my ED80 refractor to image with a DSLR. This has worked well.
I am now considering upsizing to a 120mm refractor for DSLR imaging with similar focal length of my ED80.
Will my existing Orion Field Flattener that has worked with my 80x600 refractor work with a proposed 120x600 achromatic refractors ?
What are the technical factors that I need to understand to determine the compatibility of a field flattener with different refractors ?
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