Helios 135mm f/2.8 - Sample Images
Info and Reviews:
Introduced: ??
Optical design: ?? elements in ?? groups
Lens mount: M42
Covers: Full-frame (24×36mm)
Info / Review:
http://www.pentaxforums.com/userreviews/helios-135mm-f28-quotlens-made-in-japanquot.html
http://www.robnunnphoto.com/posts/2009/12/15/lens-review-helios-135mm-f28-m42-manual-lens.html
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