SMC Pentax-M 40-80mm f/2.8-4 - Sample Images
Info and Reviews:
Introduced: 1980 - 1984
Optical design: 7 elements in 7 groups
Lens mount: Pentax K
Covers: Full-frame (24×36mm)
More info / Review:
http://www.pentaxforums.com/lensreviews/SMC-Pentax-M-40-80mm-F2.8-4-Zoom-Lens.html
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ISO: 200
Camera: Pentax K-5
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ISO: 400
Camera: Pentax K-5
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ISO: 100
Camera: Pentax K-5
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ISO: 200
Camera: Olympus E-M5
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Camera: ??
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ISO: 640
Camera: Sony ILCE-7
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ISO: 400
Camera: Pentax K100D
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ISO: 400
Camera: Pentax K100D
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ISO: 400
Camera: Pentax K-5
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ISO: 400
Camera: Pentax K-5
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ISO: ??
Camera: Pentax K-50
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ISO: 200
Camera: Pentax K-5 II
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ISO: 200
Camera: Pentax K-5 II
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ISO: 100
Camera: Pentax K-5
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ISO: 400
Camera: Fujifilm X-T1
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ISO: 400
Camera: Pentax K-5