Puzzled by Macro tubes with Pentax 100mm lens

Started Jun 8, 2012 | Discussions thread
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Roberto Angelo
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Puzzled by Macro tubes with Pentax 100mm lens
Jun 8, 2012

Have been resurrecting my Pentax Takumar lenses for use on my E-pl1. Fairly happy with the 100mm F4 Macro which seems pretty sharp (if I can hold the image steady enough to get the photo). The lens seems to be a 1:2 and as far as I understand it this means less magnification than 1:1. On pentaxforums.com they recommend overcoming this with extension tubes (probably on film cameras).

So I got some M42 tubes and stuck them on my 100mm, but I can't see any difference with or without the tubes. Does this have to do with the crop factor? Am I missing something? Thanks for any help.

 Roberto Angelo's gear list:Roberto Angelo's gear list
Olympus PEN E-PL1 Panasonic Lumix DMC-GM1 Panasonic Lumix G 20mm F1.7 ASPH Panasonic Lumix G 14mm F2.5 ASPH Olympus M.Zuiko Digital ED 40-150mm 1:4-5.6 R +2 more
Olympus PEN E-PL1
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