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hi Graham,
is it the Mark 2 or 3 mpcc?
the mark 3 has a removable T2 ring making it M48 which is a much wider opening and reduces vignetting in an F4 by a small extent.
The canon plus TS9OAG with the EOS bayonet and MPCC other end works well, round stars at all corners.
you won't need a spacer.
Cheers
Alistair
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