Originally posted by Metalwizards Will I lose much contrast/color/etc in switching to the tammy?
I've used both. Contrast + colour was about 10% better with the 40 (noticeable). Not so important though. I ended up swapping the 40 for an FA 50 1.4, which ALSO has less desirable colour and contrast. I didn't go for the Tamron because I'm picky and prefer small lenses, plus, his copy was in pretty rough shape by my standards (used).
The versatility of the Tamron is pretty phenomenal and as long as you don't mind lugging around a larger lens, you pretty much have the DA 40, DA 70, and FA 28 in one lens. IQ differences are not at all important if you shoot RAW + post process. Also keep in mind the AF on the Tamron will be slower, but thats because the 40 is VERY fast
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In short - on a budget, you can't really go wrong with the 28-75. Those are easily all of the most useful focal lengths in one lens... you can pick up something like the DA 21 / DA 15 to round out your kit for something pretty easy (and relatively inexpensive).
IMHO, the more time I spend with my FA 50 1.4, the less I care for autofocus for that lens. Generally speaking, it misses focus about as much as I do when its wide open, and it's not particularly hard to focus stopped down a bit. The M 50 1.4 is a great lens as long as you dont mind manual metering.