http://personal-view.com/talks/discussions/tagged/variation/feed.rss Sat, 16 Nov 24 05:04:39 +0000 Tagged with variation - Personal View Talks en-CA http://personal-view.com/talks/discussion/1438/lenses-variations Sun, 13 Nov 2011 07:39:16 +0000 Vitaliy_Kiselev 1438@/talks/discussions
Here’s a group of Canon 35mm f/1.4 lenses, for example, and there don’t appear to be any bad copies. It’s a nice, reasonably tight group of results. And knowing how other lenses look when they’re bad.



Unfortunately (for my sanity), all lenses aren’t primes with nice tight test patterns that make great examples. Below is a run of almost 100 copies of the Canon 24-70 f2.8 zoom lens tested at 70mm. Why so many? Because when I first tested two dozen copies they were a random smattering of results scattered around the chart. Data doesn’t make any sense? Get more data. Luckily we have a lot of lenses.




http://www.lensrentals.com/blog/2011/10/notes-on-lens-and-camera-variation

http://www.lensrentals.com/blog/2011/10/the-limits-of-variation

Unfortunately, many guys, reviewers even, completely ignore all this.]]>