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Forum: Monthly Photo Contests
11-18-2013, 08:36 AM
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While my friend was working on the PC, I noticed his reflection from the window besides him. Took few low key shots and one of it came out really cool. So much negative space, but still awesome photo.
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Forum: Pentax SLR Lens Discussion
10-05-2013, 10:32 AM
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Actually nobody answered Ken's question. :)
I own this lens, and it's quite good, considering that I bought it for 30 euros in really good condition. Just gave it a little lens cleaning and f-stopped it.
Sharpness is good in range from 100-150mm focal length, stopped at f:8 or f:11.
Distortions are close to non-existing at range of 100-150mm. A bit of pincushion distortion on 200mm.
Vignetting at 200mm, but there is no light fall-off at 80mm.
Chromatic aberrations are small if you use it in this range (100-150mm, f:8-11). Anyway you can correct this in Lightroom or any Darkroom application.
Contrast is ok, a bit washed out at f:4.5, although you can use this stop up to 200mm, I would not consider it. The lens has 11 glasses so, contrast is ok!
The quality of the blur or circles of confusion, what is widely known as bokeh is awesome, as you would expect from an old lens.
The glasses are not well multi-coated so don't point it directly in sunlight, you may weaken your sensors and hurt your eyes.
If you own M42 mount lens, opening it from behind and removing the mechanism will disable the active aperture. You won't need f-stopped adapter.
If I forgot anything, tell me. :)
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