Can Pentax make A Decent Lens? Ricoh have not fixed QC issues...

Started 6 months ago | Discussions thread
DAVID MANZE
Senior MemberPosts: 1,758Gear list
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Mighty Mike made an interesting observation!
In reply to awaldram, 6 months ago

Hi,

Mighty Mike made an interesting observation when he posted that the tested DA 50 1.8 was slightly decentered on SLR gear according to their sharpness graphs, resolution is shown across the frame by a graphic representation marked in blur units, what I hadn't noticed was that this shows and decentering very clearly. I've never really seen any comments by the author about lenses centering qualities, obviously he lets the graphs do the talking. Checking through a selection of tested lenses many appear to have slight centering problems.

Here's a link to the Pentax DA 18-135mm test;

http://slrgear.com/reviews/showproduct.php/product/1384/cat/46

Just click on the blur chart to enlarge, from there you have access to focal length and aperture changes.

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