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03-01-2014, 08:34 AM   #1
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Replacing the 18-55 WR, with either Tamron 28-75, or Sigma 17-70

Hey all,

Is there anything that would cause you to chose one of these lenses over the other?

Right now the Tamron is about $50 more than the Sigma new at B&H, but I'm really torn as to which is the better lens as an upgrade on the 18-55 WR that's on my K-50 currently.

I decided that a medium zoom would serve me much more than just getting a nice, fast 50 (I figure I can get one of those in a few months if I really want to).

I'm really leaning towards the Tamron just for the constant 2.8, so that I could get some better background separation at the longer focal lengths, but I haven't been able to find much about it here.

Do any of you have experience with both lenses?

Is there anything that I don't know about with the Tamron that I should before I end up dropping $500 on one?

Also, why is it better to go through BH as opposed to say, Amazon?

Thanks!

03-01-2014, 08:42 AM   #2
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I'd go for a 18-135 WR instead so you can keep the WR, and have a nice, silent, and decently sharp lens.
03-01-2014, 09:45 AM   #3
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QuoteOriginally posted by MrF33 Quote
Hey all,

Is there anything that would cause you to chose one of these lenses over the other?
I found the 28-75 was not wide enough and I was always backing up. The 17-70 works a bit better for me as a random opportunity, catch-as-catch-can, i.e., "walk around" single-lens option and that's the reason I bought it. If you have something wider than 28 and don't mind swapping lenses then the 28-75 might be the answer.
03-01-2014, 12:18 PM   #4
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QuoteOriginally posted by SpecialK Quote
I found the 28-75 was not wide enough and I was always backing up. The 17-70 works a bit better for me as a random opportunity, catch-as-catch-can, i.e., "walk around" single-lens option and that's the reason I bought it. If you have something wider than 28 and don't mind swapping lenses then the 28-75 might be the answer.
I figured I'll be holding onto the kit lens either way, since (I think) neither the Tamron or Sigma are weather sealed, the 18 on that should be good for now, until I'm able to invest in a dedicated wide angle lens like the 12-24 DA.

---------- Post added 03-01-14 at 02:20 PM ----------

QuoteOriginally posted by VoiceOfReason Quote
I'd go for a 18-135 WR instead so you can keep the WR, and have a nice, silent, and decently sharp lens.
Yeah, but I do a lot of low light shooting, early mornings, indoors and so on, so I'm really coveting the 2.8 aperture.

Add to that that I really want to start being able to take more "portrait" like photos that can get a little more isolation between the subject and the background (that I can't do at f5.6+)

03-01-2014, 12:30 PM   #5
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I would actually get the 18-135 and also the Tamron 17-50 f/2.8 then. That's the reason I keep both of them, thought they have overlapping ranges. If you don't mind used then you should be able to snag both for 600 or so.
03-01-2014, 01:55 PM   #6
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The new Sigma 17-70 is a nice lens but if you need the constant f/2.8 then the Tamron 28-75 is also a good lens as long as 28mm is going to be wide enough for you. Both Tamron and Sigma make a good 17-50/2.8. I recently bought the new 17-70 and am happy with it. My main motivation for choosing the Sigma over the Pentax 18-135 was price. The Sigma was cheaper. I was more interested in walk around convenience than f/2.8.
03-01-2014, 02:33 PM   #7
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My vote is for the Sigma 17-70, any version of it (2.8-4 or 2.8-4.5). You're getting a lot more at the wide end (11mm more, where every mm makes a huge difference) and you're not getting much less on the long end (5mm is not going to be all that much at 70-75).
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