Without knowing more abut the lens, I'm inclined to doubt just how "macro" it really is. Sometimes lens makers slap tht name on just to say it focuses somwhat closer than other lenses. But in order to get 1:1 (macro) reproduction with a 28mm lens, you'd probably need the front of the lens to be no more than an inch away from your subject. I'm somewhat somewhat dubious that this lens can do that, and the picture showing the macro focus scale going only to 1:4 - which is to say, perhaps not better than the kit 180-55 lens (which does 1:3, although the whole crop factor probably comes into play) - doesn't add to my confidence. You might want to write the seller to ask just close it really does focus.
Even if it really does get you 1:1 magnification, I also question whether you'd *want* to be doing macro photography from a distance of one inch. For no more than what this is gong for, you could get one of the Raynox adapter that is being discussed in another thread, which would probably work out better.
On the other hand, if this really is a true macro lens - not only capable of 1:1 reproduction, but really optimized to have a nice flat field of focus - it could be quite cool. If the price doesn't go up to much, I'm sure it wouldn't to give it a shot. If nothing else, a 28/2.8 is worth having.
BTW, the mention of Ricoh in the description makes me suggest you look into the issue of Ricoh lenses getting permanently stuck on Pentax DSLRs before attempting to mount it. It's not n unsolvable problem, but you want to be sure you have it addressed finding it stuck, not after.
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