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Latest Review Posted SMC Pentax-M 200mm F4
When I switched from Pentax to micro4/3 this together with the pentax m 50mm F1.7 were the only two lenses I kept. I had 10+ legacy lenses, most of them m-series. Though beautifully crafted, they were all made redundant by modern glass; the so very impressive olympus 12-40 mm F2.8 pro zoom together with Sigmas 60mm F2.8 prime.

This and the 50/1.7 couldn't be replaced, though.

I use it on the em-1 with a pixco focal reducer ("speed booster"). It's an optic adapter that concentrates the full frame image circle rendered by the lens into a smaller area, effectively reducing the focal length by a factor of 0,72 = 144mm. A positive side effect is that you also gain a full stop of light (google "focal reducer" for the theory behind all of this) turning the lens into an F2.8. In practice with micro4/3's x2 crop factor due to the smaller sensor, this lens then becomes a 144 x 2 = 288mm F2.8 full frame equivalent!

The whole package with camera+battery grip+lens weighs in at 1,200 grams. Compare that to a full frame Canon or Nikon 300mm f2.8, where the lens just by itself weighs twice as much!

As a last positive note, it looks pretty awesome mounted on the camera.

Image quality? Holds up very well compared to modern lenses, magnifications posted are 100% crops.

All of this at a price of $120 (lens+focal reducer). Sure I don't have AF, but a Canon L 300mm F2.8 costs $6,000. I'm very happy.

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