differences 2.5/40mm & 2.8/40mm

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41mm
41mm Regular Member • Posts: 400
differences 2.5/40mm & 2.8/40mm

There are "old" pancake 1:2.5 40mm lenses and the classic asahi smc pentax-m 1:2.8 40mm lenses.

Both made in Japan

What are the differences?

Thanks and regards

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