Kenlock Auto S 135mm f/2.8 (M42)
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Manufacturer: Kenlock The lens tested is a Kenlock Auto S 135mm f/2.8 with M42 screw mount. The lens was mounted on a Pentax K100D digital camera with the Pentax mount Adapter K (#30120) and photographs were shot in RAW mode. There has been no digital post-processing other than resizing and saving as 8-bit jpeg. Test shots were made on a cloudy day. All photographs taken hand-held with camera built-in shake reduction enabled. The lens is an all-metal construction and has a solid feeling. I estimate the filter size to be 58mm (I have no lens of which I'm sure it has a 58mm filter size to compare with). Aperture markings are f/2.8, 4, 5.6, 8, 11, 16 and 22. These are also the only aperture settings that can be used. The lens focusses from 1.8m to infinity; focussing goes very smoothly. There also is an extra mark for infrared focussing (orange R). Aperture can be both A(utomatic) and M(anual) mode. I don't know whether there also has been a specially designed hood for this lens. It should be a screw-in type. The diaphragm has six blades (see also picture below). When looking at the glass, I have the impression that a coating layer has been applied at both the front and the rear glass. |
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f/2.8 - 1/2500s - ISO400
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100% crop |
f/2.8 - 1/1250s - ISO400
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100% crop |
f/4 - 1/400s - ISO400
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100% crop |
f/4 - 1/2500s - ISO400
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100% crop |
f/5.6 - 1/1000s - ISO400
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100% crop |
f/8 - 1/160s - ISO400
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100% crop |
f/11 - 1/125s - ISO400
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100% crop |
f/16 - 1/160s - ISO400
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100% crop |
f/22 - 1/125s - ISO400
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100% crop |