Originally posted by Canada_Rockies Norm, you are causing me a whole bunch of LBA here. I have the 55-300 ED, and the image quality is generally good enough for me, but the AF ....
I managed to snag a raffle entry for the K-1. Maybe #31 in the 4th raffle list will be the winner, and then I have to decide image quality (60-250) vs AF (PLM). I'm seriously leaning toward the PLM lens, but would be very interested in your take on the two. I won't be keeping the K-1, even if I do win, and I'm not holding my breath for even the 1 second that made me #31, but I definitely will pick up the K-3 II when the budget allows, and winning the K-1 would add serious money to the photo budget, and SWMBO would have nothing to say about it, since it would be free money. And here I go spending what I have 299 chances out of 300 to not get
The PLM has taken over the DA 18-135's role as my utility walk around lens. Landscape will wait for a lens change, wildlife , usually not. I still prefer the IQ of my DA*60-250, but I often don't want to carry the weight. If I were buying one or the other right now, it would be the 55-300 PLM. The AF alone is to die for. And I'm no longer interested in setting up at craft shows to sell prints, so enlargement is no longer a factor.
The one negative is, it has worked poorly with the 1.4 TC because of the lack of light. For long range images using a TC you need a faster lens. Normally I shhot the Tamron 300 2.8 or DA* 60-250 at ƒ5.6. At 300mm the PLM maxes out ƒ6.3. IN really good light I stop the K-3 down to ƒ8 for assed depth of field, and at that point, the wide aperture disadvantage is moot, although the lens can search to lock focus from time to time in shadows, because it's ƒ6.3 and the camera's AF system is tuned to ƒ2.8.
Personally, I think what you get for the price difference is just not justified, for the causal photographer. Having owned a Sigma 70-300, this is almost a different class of lens in terms of IQ.