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Peter,
I'm about to trial a Zuiko 135mm telelens with the FULL modded Canon, but I'll add a UV-IR filter to suppress the NIR (previous images with a 85mm Canon prime gave good star images but also showed the small NIR bloat on fainter IR stars.)
(Which UV filter were you using? I have an ol' Lumicon -UV filter which I've used in the past with reasonable results)
Stay tuned......
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