Brendan MacRae wrote:
Was SMC applied to both sides of lens elements?
Apparently, original SMC was only applied to air-to-glass surfaces. That's because with the introduction of A-series lenses, Pentax claimed that at that point all lens surfaces were SMC-coated. To me, it looks just like a standardisation of lens-making process. I expect no improvement and no problem from a standard smc "uselessly" applied to glass-to glass surfaces too. Probably a marginal advantage could come from a tuned coating, adapting glass elements of different indexes.
Although never documented by Pentax, it is believed that smc coatings changed over the years, as the different color reflections often suggest. Sure some change occurred from M-series to A-series and in other instances.
Dario
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