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Forum: Pentax SLR Lens Discussion
10-05-2018, 05:47 AM
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i believe some where there is a thread discussing the cross over between the 8 element and 7 element in production, and while the infra red focusing dot and the A/M switch are indicators,there are some hybrid lenses where the 8 element parts appear on early versions of 7 element lens. The only definitive identifiers of 7 element vs 8 element are the physical shape of the rear element, AND the weight, the 7 element is 230 grams vs 245 grams for the 8 element. the weight is definitive, but usually you don't have the physical sample in your hands, so shape of the rear element is what people use.
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