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One of the sharpest lenses I've ever had. Comparable sharpness with the Nikon 105mm macro!!! Wide open soft, but from f4 and up supersharp. Downside is sensor flare with digital, which is not acceptable for me. I've used it on Sony A7, but sold it due to sensor flare.
Possible the sharpest lens I own at both macro and telephoto end. Built like a brick with smooth focusing. The only negative is with very contrasty macro images some sensor reflection can be seen in the high's. Review based with the Sony Nex5n.
This lens is excellent on my AE1-P and OM40. The build quality is flawless,as good as my FL19 R. The colours are amazing - seriously, I could not believe just how great those corny pictures of bright flowers on a sunny day are! The focal length makes for a nice portrait/shortish telephoto, and the fast aperture makes it ideal for low light situations. The focus seems to snap into place - it's so obvious when it is. My one big reservation is the requirement of an adapter to make it 1:1 macro. This recalculates the aperture for you, and obviously, you lose light. Also, the front element is almost exposed. A hood is a very good idea if you want to use this lens - I've only used it without the once, and experienced some flare. I'm looking forward to using this lens a lot more.