![]() Closing the aperture just one stop made for substantial improvements in sharpness, with good to very good sharpness in the middle of the frame, and only minor softness in the corners and edges. ![]() We've left the 24mm results in the interactive viewer for APS-C sized sensors at right, but suggest for now that you actually look at the central portion of the full-frame blur plots (where it actually does surprisingly well across the entire frame) to get a better idea of how tthe lens performas at wide angle and large apertures.ĪF issues aside, this lens is an ok performer wide open but did show some significant softness on the left side of the frame at 35mm and 52mm focal lengths on the sub-frame body. ![]() As a result, the results at 24mm and f/2.8 shown at right probably don't represent what the lens can do on sub-frame cameras. (Which seems to focus pretty well with most other lenses.) Our micro focus-bracketing protocol eventually dealt with these nicely (as evidenced by the excellent agreement between results on the 20D and 5D bodies), but crossed wires internally resulted in the micro-bracket tests not being run at 24mm on the 20D body. This lens was a somewhat vexing one to test, as it consistently showed problems caused by AF accuracy issues between it and the 20D body in our lab. ![]() The first SP lens among Tamron's high power zoom lenses, the lens represents a new concept in high power zoom lenses, achieving outstanding performance characteristics worthy of the name SP (Super Performance). (From Tamron lens literature) This zoom lens from Tamron covers everything from the 24mm real wide angle that professionals and serious amateurs demand, to 135mm telephoto suitable for portraits: all in one compact package. ![]()
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