Originally posted by bertwert I think a 55-300 is probably better for me at this point and it is less than half the price. Just which one...? Main advantages of both WR ones; the PLM - faster/silent AF and electronic aperture (if the K-50 actuator bites the dust) or the non-PLM - faster (almost 1/2 stop) and cheaper. Decisions, decisions..
I have the DA-L and the PLM versions. Obviously the PLM is a much nicer lens: quiet and fast AF, folds up small, QS, WR, quality build. But just on optical quality, there isn't much between them. Subjective impression is that, although 1/3 stop or so slower, the PLM is better wide open. It certainly has better bokeh. I rarely use the DA-L wide open at 300 anyway, so the slightly slower aperture on the PLM is not a big deal for me. If anything I feel little hesitation about shooting at 300mm f6.3 with the PLM, which I do with the DA-L.
At f8 (which is where I have always tried to be with the DA-L) there is very little difference in optical quality between the two. For a <$150 lens, the DA-L amazing.
All things equal, get the PLM. No question. But if money is tight, and you mostly stop down anyway, the WR version of the screw driven 55-300 is still a good buy if you can get one for significantly less.