One of the reasons I chose the TOAG was that it only adds 10.5mm to backfocus, and so I could still readily keep all the correct spacings, on both the C8 with the f/6.3 FF/FR and 'fracs with the 0.8 FF/FR. It's only $225 delivered from Bintel. It comes with one 15mm spacer (and a bunch of attachments), but I already had a kit with 5, 10 & 15 so was able to get the right combos.
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