50D micro-adjustment, and, anything better than tamron28-75f2.8 similar range?

Started May 29, 2012 | Discussions thread
Sailor Blue
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Re: 50D micro-adjustment, and, anything better than tamron28-75f2.8 similar range?
In reply to SteveAnderson, May 30, 2012

I have the Tamron SP AF28-75mm F/2.8 XR Di on my Canon 7D. I think ptl-2010's assessment was quite accurate as far as it goes.

The lens is very soft at f/2.8, acceptable at f/4, and very sharp from f/5.6 to f/13 or so. I am easily able to see individual eyelash or eyebrow hairs in a half body portrait shot at f/8. At f/16 the loss of sharpness starts to become noticeable due to diffraction, but sharpness is still acceptable. At f/22 to f/32 you are back to soft images.

I checked but didn't need any AF Microadjustment. Here is the best free way to test and set AF Microadjustment I have found.

http://www.birdphotographers.net/forums/showthread.php/58042-AF-microadjustment-tricks

I tried Canon's EF-S 18-135mm f/3.5-5.6 IS kit lens but I found that I had low light focusing problems. I chose the Tamron for portraiture because, as you said, it is the most affordable zoom lens in that focal range and gave me the ability to successfully use AF at low light levels.

When we mentally recall people's facial features they appear to be about 15 feet (5 meters) away. With a crop sensor camera you can shoot full length portraits at 50 mm, but for headshots you need about 135mm. If you can shoot at longer subject/camera distances you might be happier with a 70-200 mm lens.

http://www.kenrockwell.com/tech/portrait-lenses.htm

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