Summary: This is my favorite lens. It produces the most amazing close-up photographs. I have used it on flowers and bugs, and even as a portrait lens, and the results are amazing every time. The clarity and sharp focus are astounding, even using larger apertures in low light conditions. The quality of this lens is very well matched to the performance capability of the A900.
Summary: I have yet to find anything I do not like about this lens. I bought it specifically to take close up photos of flowers and the images I have captured thus far are astounding. The AF capability is great and the ability to limit the focus range is very nice. The price for lens of this quality may be a deterrent, but the old cliche about you get what you pay for is certainly true with regards to camera lenses. My recommendation would be "Buy It Now".
Summary: I am a macro fan so it goes without saying that I ADORE this thing. It does what it was designed to do brilliantly. I do not see it as expensive. I think that its worth its price. I just love what it can do. The colors are excellent too. Especially when you know what ur doing in terms of lighting and all that. However, that being said, this really is not an easy lens to use. this is actually one of the hardest lenses to hand hold with low shutter speeds and at f2.8.
Summary: This is a great lens, it is Tack-Sharp. If you can afford it, BUY IT. Little word of advice to beginners: Learn fully to operate this before you go on a big venture. Auto-focus is fast but sometime can cause unwanted effects, specially if you are hand-holding the Camera. You cannot just rely on Auto-focus. Tripod becomes hindrance with Marco photography so you really should use this in Manual Focus Mode with correct exposure. Pictures from this lens are joy for the eyes.