Is this true about the Tamron 90mm, f2.8 macro lens?

Started 5 months ago | Discussions thread
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jackdan
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Is this true about the Tamron 90mm, f2.8 macro lens?
5 months ago

From an Amazon review for the Canon version.

"This lens is only 2.8 at 10 feet to infinity. The maximum aperture drops as you focus closer, and at minimum focusing distance, where many will want to work to get the true 1:1, it is all the way down to 5.6."

http://www.amazon.com/Tamron-AF-90mm-2-8-Di/dp/B0007YZLIK

I have the Pentax 35mm, f2.8 and am trying to learn the pros and cons of each at taking photos at the minimum focus distance, which I assume is where the max magnification occurs, but am also interested in what the Tamron lens can do for me in general that the 35mm can't, beside shooting insects, and human portraits. One thing in particular I wonder about is how the longer minimum focus distance affects the difficulty to achieve focus at MFD and if it affects the DOF at f2.8 and MFD.

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