No idea. With only 8,000 of those lenses made, I think obtaining any parts that may be exclusive to this model would be extremely difficult.
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Ricky
EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
EOS C70, RF 24-70 f/2.8L IS, EF-EOS R 0.71x
