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After having some similar reports (from other forums), it looks like this FF-FR is only useful for small, dim targets, and only with with heavy cropping of everything outside of 1/4 distance from APS centre (so useful field diameter is ~15 mm or less).
I am thinking now about DIY - I have couple of surplus objectives from binoculars (20~25 cm FL, ø40-ø50 mm).
Mounting them inside the camera adapter tube should not be the problem.
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