Which ASI6200?? MM or MC? If MC I'm guessing you won't be using a FW? I think the ASI6200MM with FW & OAG may vignette. I don't have the right adapters for my Pentax 125SDP (88mm image circle), and currently only have the adapter for my µ250CRS (40mm image circle).
Some folks are custom enlarging the M54 tilt adapter to M68 to see if it'll address the ASI6200MM vignetting.
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