| Latest Review Posted | SMC Pentax 135mm F2.5
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Two versions were introduced, one in 1975 and a second in 1977 which differ only in the name plate. Mine is the older version with "SMC PENTAX 1:2.5/135" on the nameplate. The newer version appears to differ only in the name, which adds "MM" at the end. The lens has 6 elements in 6 groups and 8 aperture blades. Minimum focus distance is 150cm (59 inches) with a maximum magnification of 0.11x which can of course be enhanced with diopters or extension tubes. Speaking of diopters, the front filter threads are 58mm. The lens is 86mm long (3.4 inches) and weighs 500g (1.1 pounds).
The lens is somewhat heavy but handles very well on the K-1 full frame DSLR. On lighter or smaller cameras, it may be slightly front heavy, but on my all metal film units it handles well. Focus action is well damped as the lens extends when focusing close. The aperture ring goes from f/2.5 to f/32 with half-stop indents between all but the last two apertures, each click stop is audible and clear. There is a focus distance window at the top that crops out of range measurements, showing only those distances that should be in focus at available apertures.
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The lens is sharp wide open and fairly easy to focus with the stock K-1 focus screen. Image qua... |
