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Latest Review Posted SMC Pentax-A 135mm F2.8
The Pentax-A 135mm f/2.8 is a nice glass, though a bit a delusion af f/2.8: the Auto-Chinon 135mm f/2.8 does better at full aperture, but being a (rare?) M42 lens, I would still recommend the Pentax-A. From f/4 it is quite a lovely lens and better than the Pentax-M 135mm f/3,5. Here, I posted a comparison of the three lenses here (sorry for the crop images do not tell the whole story beacuse thay are automatically generated):

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