Originally posted by lesmore49 I've had my 28-105 for about a month now. I've used it on my K-5 and K1. I like it a lot. Excellent sharpness. Although some may express concerns about the fact that it may not be fast for indoor situations, it's not an issue for me. As others have said they...and I use my faster lenses....50 Macro F 2.8, 50 normal , F 1.4...also have some Limiteds (ASP-C)...40mm F 2.8, 70 F 2.4.
But for a general purpose, good all rounder, I find it hard to beat.
I do wish it was a bit faster and a bit wider (24mm)....but no big deal really, fine the way it is.
I would recommend it.
Thanks for your input. (I love this place!) In general I've been a prime guy, but do have a couple of zooms. They're good, just not amazingly great IMHO compared to something like the DFA 100 or *200. . I've had better shots with the 50-135 but it a relatively slow focuser compared to my other glass and thus not my first choice for quick "street" shots.
I think the quicker AF of the 28-105 (it is quicker isn't it?) might fill a niche more for me but I don't particularly want to keep multiple somewhat expensive lenses in the same focal ranges without good reason. That's why I asked whether I'd be giving up image quality, and particularly IQ, if I replaced a couple of them with a 28-105. Bottom-line image is more important to me than quicker focus. I can work on technique more but if both the 28-105 and 50-135 are in the same neighborhood image-wise. . .
Originally posted by DeadJohn The 28-105 is a sharp, compact, relatively inexpensive lens. I like it a lot on my K-1. However...
IMO using the Pentax 28-105 to replace the Sigma 17-50 on a crop sensor is a mistake. You'll lose the entire 17mm through 27mm zoom range while hiking, a range I like a lot for landscapes.
How often do you use your 17-50 and 50-135 at f2.8? If you don't care about shallow DoF or handheld low-light usage, and can live within the 28-105 focal range, then go ahead and replace those 2 lenses.
I've used the Sigma many, many times but to be honest haven't hit many Wow shots with it. Some really nice ones but nothing that seriously impressed me. And I do have the 15 Ltd and 10-17 Pentax if I think I might need that really wide shot. The 15 wouldn't take up any room in fact, so not at all inconvenient to carry along I suppose.
Maybe this is one of these instances where I just need to get one and see for myself, then sell off what I then don't see need for?
Last edited by gatorguy; 03-17-2017 at 05:05 PM.