Make sure to enable subtitles as they provide context about what is going on.
6 Likes
Thanks, for that link, hatsnp!
Quite informative and fascinating.
I’ve never really thought about what degree of automation and manufacturing by hand my lenses are the result of.
A little unclear what final optical tests each lens will receive, though. (A little hard to believe they are mounting each lens by hand with a screw on an ordinary freestanding tripod for such checks.)
Anyhow, likely will be treating my lenses with even more admiration and appreciation after seeing this.
2 Likes
They use a Sigma-built tester called an A1M which incorporates a Foveon 3-layer “Merrill” sensor.
1 Like
I don’t know, but that resolution test which happens from 20:48 seems a little non-standard. Together with the mechanical tests that follows, it gives more impression of some random sample laboratory test.
EDIT: In some photo forums there is much talk about sample variations in lenses, (not specifically linked to Sigma). I have no idea to what extent this may really be a non-significant factor, and it could be interesting to know what variations manufacturers accept in production.
More input:
They test all lenses … no random sampling.
Thanks, that was more like what I’ve thought about lens testing, yes.
They seem to test the elements individually beforehand, so the variation must be the sum of the accepted margins in every element, sometimes a dud comes out. This is pure speculation on my part of course.
Edit: just saw the links above, nevermind
1 Like