Originally posted by Saltwater Images I'm always puzzled at how often the amazing, optimized for APS-C , delightfully compact, pixie dust rendering DA 70 is overlooked by crop sensor shooters.
Mine doesn't get as much love as it should, but that's mostly because I discovered only too late that it has a relatively long minimum focal distance - and I like to get up close. REALLY close (among other things I have rather small dogs for whom a frame-filling shot is an impossibility with the DA70, even on APS-C, unless you want canine front-bokeh). When I can get a good shot, OTOH, the results are really quite impressive. The optics are to die for.
If you KNOW, beyond a shadow of a doubt, that you will move up to the K-1 one day, the DA70 is not such a good idea and an FA or D-FA is a better bet*. When I bought my DA70 the K-1 specs and price hadn't been firmed up, and I couldn't see myself changing up from my K-5 until it was dead, at which point economics said FA77 vs. DA70 and a significant slice of DA15 (the DA21 followed as a corollary).
Then the K-1 came in at an almost unbelievably low price (compared with the worst projections), with mind-numbingly good specs and little if anything bad to be said about its stills-photography capabilities, and that was that. In retrospect, and considering how much film photography I do on K mount bodies, the FA77 might have been the better buy... but everything is easy with the "retrospectoscope".
Long and short: if you're sticking with APS-C, the DA70 is not to be sneezed at - but you will find yourself stepping back a bit compared with most lenses.
* = Yes, you can shoot in crop mode to eliminate any hint of corner vignetting or unsatisfactory performance, but for K-3 shooters it's a big step down in MP. OTOH K-5 (and related body) shooters don't lose enough MP to matter. Everyone else (i.e. pre-K-5 bodies) gains, in every way.