Pentax 67 400mm F4 SMCT

[J. C. O'Connell]

Anyone ever use the subject lens? I'm talking about
the older one without the ED glass. Is it as sharp
as the the 200 and 300 SMCTs? I'm concerned about
chromatic distortion I read about with the 600mm F4.
Is it better than the 200 with a 2X? Any input
would be appreciated.
JCO
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