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If you want to get an inexpensive non-AF lens that is truly excellent try the SMC Pentax-A 50/1.7, cheap and very, very good.
Don is absolutely right: with regards to value for money, the A50/1.7 is _very_ hard to beat. I only dislike the way bright spots/highlights in dark scenes turn to hexagons.
For more lens opinions, see <http://stans-photography.info/>. Hope this helps, -- Regards, Lucas

