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| p.1 #5 · another 24-70 f/4 IS vs 24-105 f/4 IS comparison |
I find the comparison at LensRentals.com is the most accurate one. They tested by reading and averaging MTF values from a bunch of samples they had there.
I understand that, at the end, it's all about real-world tests. But, taking photos of random subjects and then "to the eyes of the tester", not sure I can honestly say it's a valid comparison.
Anyway, appreciate the link though.
Tests are best done when using both MTF and visual comparison while focusing in live view with multiple re-focusing atempts and cross refferencing both MTF and visual comparison. I test lenses that way and that's just for my own purposes:
Anyone can take the time to do it, it's not hard. Just download a simple MTF program and print out a test chart on a large format printer at your favorite printing place.
I have a test chart permanently glued between two sheets of glass from home depot in my utility closet.
Total cost and time involved $60 and 4 hours of work.
I clicked on this link to see if anyone else tested this lens at 50mm, as 5/6 copies that I'm aware of that have tested this length have shown that it performs very poorly in the middle of the focal range (much worse the than 24-105mm). It seems that nobody even thinks to test lenses anywhere but at the extreme wide and telephoto ends based on the reviews posted here.
It's a shame, I'm holding out hope that if you were to buy 4 or more copies one would not have any issues at 50mm.