I'm pretty sure they went really cheep, (which isn't necessarily a bad thing), in the design phase, and it's just a modification of the optical design from the old 50 f 1.7 or 55 f 1.8 standard lenses.  I can't find an optical formula to compare to confirm that, but it seems to be a better design optically than the M and A f 2.0 lenses, by all accounts.

On 12/10/2018 4:56 AM, J.C. O'Connell wrote:
I just picked up the subject lens real cheap $55 shipped
and I was wondering what the concensus is on th image quality
with crop sensor bodies. tia
J.C. O'Connell
hifis...@gate.net
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