Runslikeapenguin,
Not sure if you are aware of my photojournalism work, however I have come to 100% depend on the 16-50. It is, without any question whatsoever, my workhorse lens. I am deployed to Afghanistan as a combat engineer officer, and currently am employed behind a desk managing Afghan trainers across Eastern Afghanistan. For the first 8 months, prior to being reassigned, however, I was the team chief (aka OIC - Officer in Charge) of an Embedded Training Team (4 personnel including myself) that instructed, mentored, and advised an Afghan company (about 80 personnel) on how to do route clearance operations - basically how to comb the road for hidden bombs, more commonly known as IED's - Improvised Explosive Devices. During the transition between that position and my current one, I spent about two weeks operating in a "combat camera" role. My company conducts route clearance as well, and I had been approved by my commander to tag along on missions and take pictures while soldiers did their thing.
Why that is important for you to know (I think), is that it gives context into the demanding environment and situations that I photographed and that my gear was subjected to. My 16-50 has held up perfectly, and can honestly say that I'd guess it is responsible for
at least 80% of my photographs since arriving in theater.
Regarding specifics as to how I've used my camera gear and the treatment they've withstood (which I am confident will most likely surpass what you plan to do), I invite you to read this:
Weather Sealing Testimonial.
I need to update that post as there are some more recent additions of usage, but you get the point lol. If the images do not show up in the above link, then try another internet browser. IE usually works if you hit
DISPLAY UNSECURED CONTENT or something along those lines.
Also, for actual photographs of my work, please take a look at this:
Deployment Update Fourteen. That is the most recent publication of my military photojournalism here in Afghanistan - all 13 that precede it can be accessed from there. There's over 250 images uploaded so far, and I tell which camera/lens combo is used for every picture.
Regarding the 16-50's IQ, I do not feel very comfortable using it wide open because I find it soft, which seems to be the general consensus, hence why I have the Sigma 30 f/1.4 and the Pentax DA* 55 f/1.4 should I need low light in that range. 16-20mm I can handhold comfortably with Pentax SR on down to 1/6s easily enough, so stopping down isn't an issue at the wider end. I use my 16-50 between f/5.6-f/8 and have had no issues with IQ at those apertures when it comes to sharpness - again take a look at the images in my links, there's hundred of them with the 16-50 that should satisfy your request. When I return from Afghanistan next spring, I plan to pick up the 18-135 as a better hiking/mountaineering lens, and I will do a comparison between the two then.
Finally, there will inevitably be concerns of SDM failure. In case you weren't aware, the SDM is the in-lens AF motor that DA*'s are equipped with. Not very fast when compared to the Canikon and Sigma silent motors, but completely silent. The 16-50 is considered the least reliable when it comes to the SDM not failing (affectionately referred to as the "Sudden Death Motor"). Which this is a reality, my personal experience is that after over a year of extremely abusive use, it still continues like a champ, and I am the third owner of my copy, purchased here on the forum for a great price. I know there are many others who will say they have had their copies since one of the first batches and no issues, so it really is a gamble, as shitty as that is to say. My personal assessment is that the probably that you will never incur SDM failure far outweighs the risk of it failing, and
should my lens fail on me, I would replace it with another 16-50 without hesitation.
Also, should you decide to purchase the lens, please take note of this in case you were not aware:
Pentax Lens Pricing
Please let me know if this has not been helpful to you.
-Heie
O/T, but beautiful images Rondec, specifically the second one.