Alright, so I totally failed at participating for the month, but it has been a really enjoyable month. I used my August lens almost every day (except for today and yesterday).
The lens for me this month was my new (gray market) Tamron 28-75/2.8 XR Di.
I have bought very few lenses new (just the Rokinon 8/3.5 and the 18-50 kit lens that came on the K-S2), so the purchase was pretty special and I wanted it to be a good one. I bought the lens with the intention to use it at a wedding I've unfortunately promised to shoot on October 1. (I'm counting down the days until my doom.)
Physically, the lens is pretty large. The diameter is significant, although it's not the lengthiest lens I own. It is reasonably light weight, as far as I'm concerned, but I do have a lot of experience carrying around old vintage zooms that are metal and glass, so "light" to me may not be defined the same way to others. It feels well-balanced on the K-S2 and never seemed to be an awkward match. The lens is plastic, but it feels solid and not cheap. I appreciate that this is a lens with a physical aperture ring... 'cause it's better to have it and not need it than not have it at all. I'm kind of a "doomsday prepper" for aperture rings. My lenses that don't have them are really the red-headed step-children of my lens collection. Anyway! Full marks, there. The focus throw is short but surprisingly, satisfyingly workable as a manual focus operation, probably owing to the bright f/2.8 aperture - subjects snap into focus without much guesswork. Infinity is reliable as marked. The lens is advertised as "macro" and MFD is about 5-6 inches from the front element, which is pretty satisfying, but I did find myself using one or the other of the Raynox snap-ons to get truly CLOSE. The lens is a twist-to-zoom, and I gotta admit, it feels chintzy. It's not particularly smooth or well-dampened. Instead of feeling like rolling on ball-bearings (like some of my glorious old manual zooms), you can really feel (and hear) the plastic dragging across plastic. It's probably my second least favorite thing about the lens.
My FIRST least favorite thing about the lens is the awful, awful ghosting and total lack of pretty flare. I have never had a lens create such horrid, vivid ghosts in my whole (short) camera-owning life. I found no way to control it or turn it into anything more attractive (like a controlled, directional flare), and it made me very sad, especially because I spent a lot of nights shooting at the Missouri State Fair this month and bright, in-your-face lights were part of the game. As much as I could, I cloned out the ghosts, but a lot of images got binned because it was just completely trashed by big stupid ghosts.
This is the best I was able to do with it:
And here you can see a very mild example, growing off the top of the lights at the top of the slide:
It may seem like I'm totally overreacting with those examples, but trust me. You're not seeing the ones that were really really really bad. Really bad.
MOVING ON, all other performance by the lens was pretty delightful. Colors were great, any CA isn't worth mentioning, it seems quite sharp at all apertures and the rounded blades made every bokeh beautiful. Not being an auto-focus person by habit, I was very, very pleased with the speed and accuracy of the auto focus (I used back-button focusing) when using the viewfinder, but I'm still kind of shocked at how slow and terrible it is when using liveview. But, I don't really use liveview all that much, so I was barely effected. Even on APS-C, the zoom range seemed excellent to me, walking around at the fair for 11 days in a row. I'll bet its even more delightful on full-frame. Obviously, I loved having the constant aperture.
Some of my faves from the month:
All in all, yeah, it was an excellent buy. It's a great all around lens, fast aperture, very good zoom range for my typical application, and it's not overly large, in my opinion. This is definitely a walk-around zoom for me for when I don't know what I'll encounter, and I think it's going to be perfect for the wedding... I just need to remember to be mindful of my light and to bring a lens that flares pretty. :-)