I've always tried to limit any lens to a weight below 500g. If anything beyond that limit is in my gear, I find ways to leave it behind. The DA* 50-135 is an excellent lens, but the 410g 55-300 is good enough and substantially lighter. No 120mm f/2.8 shot with that lens of course.. but I seldom shoot those anyway since I never had any practice before! In a similar vein I've noted before that my 18-50mm Sigma covers the 21-50mm gap very well, and at around f/4 most of the time.
As the wet season approaches I feel the lack of a WR kit more keenly. I do enjoy getting the in-storm images of water droplets and fierce weather, and the K-s1 and 18-50 would not be the best choice. I also found during the lunar eclipse that the lack of interval timing/video troubles me, as it did receive some use at important times in the past. The K-r did that for me during the eclipse so it's not a big deal - but I have two DSLR camera bodies and neither is foul-weather friendly. That's sad.
|image from Pentaxforums.com|
On yet another hand, my DA15/K24/DFA50 triplet is a clean 100g heavier than the 16-85. Going with my lightest trio (the 50A non-macro) I am just about smack on the 500g barrier. So with primes I can shoot with a lighter lens on the camera but the overall pack weighs the same or more! And as for price.. well if I sold the Sigma and DA15 (gasp!), the K24 and perhaps the smc-M 100/2.8 .. the switch would be self-financing. That puts me back near prime-free mode but it cuts way back on the feeling that I should have carried another lens or two. The two DA zooms will manage 16-300mm, and the DFA50 can come along for closeups.. I'd be OK with that.
One more problem relates to video, and Pentax' fake (digital) stabilization instead of SR. The 18-50 Sigma has internal OS so it can stabilize in a better manner than the camera. Back in the K-r days the SR system did stabilize the video but those days have passed, for some unclear reasons..
The other big WR piece then needs to be addressed. K-s2 or K-3? While the K-s2 would address nearly every need I have, I'm not prepared to speak with certainty on this one. Both weigh more than the comfy little K-s1, but the absence of a few big features (e.g. interval shooting of stills/video and custom settings on the mode dial) is being felt. I'd be fine holding out a while on that decision and let the WR lens be on the K-s1 despite its relative nose-heavy feel. Baby steps are OK for now.
And perhaps the next APSc Pentax will be a much better fit for my style, as it could incorporate the SAFOX XI AF system with the new Clarity function, and toss in the 200k shutter life. As always - we shall see!