Reviews and Problems with Tamron SP AF180mm F/3.5 Di LD
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BE AWARE!! Not a constant F/3.5 aperture @ 1:1 Macro!! It's an F/5.6!!
M. ewing "liberalpoet", Amazon
25 May 2014
Summary: While the Tamron 180mm "3.5" is in fact a great lightweight lens, with nice Bokeh, the lens automatically stops down (at least the Canon version that I purchased) to f/5.6 at 1:1 even in Manual Mode.
Excerpt: I took about 6000 pictures with this lens, of which I kept 4576. Not bad, you say. Yes, the optical quality is perfect. I took 100s of metal material shots, oodles of critters and even sunsets. till the day the paerture linkage started to stick.
Summary: The copy I had didn't autofocus correctly, it had a back focusing problem. But even ignoring this, the autofocus was so ridiculously slow it was practically unusable. As someone else said, you could go get a cup of coffee while this thing focused.