Under a different thread, joerg krusche said, in part, [...] the only thing you have to do is to get two rings to adjust for spacing, which is not critical since [it is] a symmetrical lens design. Optical performance should satisfy all needs.
Is it true, then, that Biogons (8 and 10 element later designs) can well tolerate a variance from the factory cell-spacing at the shutter? Or are they not symmetrical enough?
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