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Latest Review Posted SMC Pentax-M 100mm F2.8
I bought my copy at a bargain price because it is stuck wide open and has a scratch on the front element but otherwise clean and good mechanically (hence no price listed to throw off the average). I used to own the "A" version and can confirm that sharpness improves as you stop down, but the real draw here is that IQ is very very good wide open at f/2.8. I have some pixel peeping tendencies and while f/8 is certainly sharper, I cannot in good faith knock the wide open IQ at all. This is especially true if you consider the diminutive size, ease of MF, buttery bokeh and price/value.


I use this M lens exclusively in Av mode on the K-5/K-50 since it won't stop down anyway.


Purple fringing.....if you shoot a tree against a bright sky at f/2.8 you may find that entire branches turn purple. It is borderline comical in some situations, but still easy to remove in PP. You can spend a bunch more and get a modern lens with similar specs that doesn't exhibit PF, but personally I'll suffer through a few mouse clicks on my keepers to get where I need to be.


I recently took some test shots comparing this lens to the Kiron 105mm f/2.8 Macro (mint copy). At portrait distances this SMC-M 100mm f/2.8 is noticeably sharper, easier to focus, and has smoother bokeh. Interestingly, the Kiron seemed to have a shallower DOF at the subject yet did not blur the background as smoothly. All comparisons were made wide open at f/2.8.


This lens can produce pro-quality (or clo...



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