how good is the image quality of an image at 100% from a wide angle lens (24mm and wider)? i see significant improvements at 50mm and another significant step at 80-100mm. this is with several lenses with several cameras. it takes significant sharpening (300/.5 smart sharp) to bring any detail out of the image, it is very soft.
currently i shoot a canon 1d3, sigma 12-24mm, canon 24-105/4 and canon 70-200/2.8. i have had the canon 16-35/2.8 v1, a 1ds2, 1d2.
and soft in a weird way. and i can get that at 5.6 iso 400 on a sunny day so its not me. i know about AF micro adj. which helped a lil. with the sigma at 12mm with a close subject focus was correct at 0. at 12mm with a distant subject, 50ft, focus was horribly off. at the same distance at 24mm focus was correct at 0.
sounds like a rant about the lens, i dont want it to go that way. when i had the 16-35mm i sold it for the sigma unhappy with the canon. same problem. even the 24-105 has this soft characteristic at 24mm. but portraits i shot recently with it at 50-105mm are amazingly tack sharp. actually i find the sigma to have less CA and distortion than the canon. but that was an older lens and i understand it was improved in a new version.
now all the wides were soft at 100% with a 8-10MP camera from a full res raw file, from a 1/4 res raw small file the images were quite good. current examples from the 1d3 produces a Sraw file of 1900x1200, so its large enough to check some detail. my tests were soft, obviously as described above, but most of my work, home interiors is shot Sraw and is great. so its a the test say they are bad but my work says it is fine situation.
so whats a man to do? considerations: see if the lens is defective with sigma. Canon 16-35/2.8 v2 or 14mm v2. open to your suggestions.
(this is what got me onto MF digital 2 years ago and then on to a cambo wds...finally the IQ i want! but i cant shoot it all the time so its not a good replacement)