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06-26-2014, 11:52 AM   #1
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Whiche lens for my K5-IIS average: 17-75mm f/2.8

Hi I need some help to choose one of this lenses.
I am realy disorientated

Brand Model
Sigma Sigma 17-50mm f/2.8 EX DC HSM Zoom Lens
f/ 2.8
Filter 77mm
Price 519


Brand Model
Tamron Tamron Zoom Wide Angle-Telephoto AF 28-75mm f/2.8 XR Di LD Aspherical (IF) Autofocus Lens
f/ 2.8
Filter 67mm
Price 499


Brand Model
Tamron Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF] Autofocus Lens for Pentax Digital Cameras
F/ 2.8
Filer 67mm
Price 499


Brand Model
Sigma Sigma 17-70mm f/2.8-4 DC Macro HSM Lens
F/ 2.8-4
Filter: 72mm
Price 499


Thanks!

06-26-2014, 11:56 AM   #2
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I found 28 not wide enough, 50 not long enough. That leaves 17-70, which is a good range if you just go out with one lens. The Sigma 17-70 also focuses pretty closely.
06-26-2014, 11:57 AM   #3
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They are all really good, though the 28-75mm isn't wide enough for many users. The Sigma 17-70mm gives you a more convenience zoom rage plus decent macro performance at the expense of a stop of light and a little bit of image quality.

We have reviews here:
DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison - Introduction - PF Reviews
Sigma 17-70mm F2.8-4 Contemporary - Introduction - PF Reviews

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06-26-2014, 12:25 PM   #4
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Hey, welcome! What lenses do you have right now? Do you have the DA 18-55mm? That should help you decide if 24mm is wide enough, if 50mm is long enough. If you want a "do all" zoom lens, a 17-70mm is great. Some prefer two zoom lenses, one that goes wide angle (number lower than 28mm) and up to 50mm, and another that goes from 50mm and up (like DA 55-300mm). Others like to add an ultrawide zoom, like 12-24mm and then go from there.
So I would say it depends on what your plans and needs are. How many lenses do you want to get eventually, what kind of range do you need

06-26-2014, 12:56 PM   #5
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Now I have:

Tamron 18-200 f/3.5-5.6
SMC Pentax-F 35-80mm F4-5.6
SMC Pentax-F 100-300mm F4.5-5.6
06-26-2014, 01:14 PM   #6
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What is it you want to do that your current lenses can't do for you?

I'm not sure I'd get another zoom with what you have, but then not everybody like using primes...
06-26-2014, 01:15 PM   #7
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[can't edit or delete previous message]

Now I have:

Tamron 18-200 f/3.5-5.6
SMC Pentax-F 35-80mm F4-5.6
SMC Pentax-F 100-300mm F4.5-5.6


In a few weeks I will buy the Tamron 70-200 f/2.8 (for sports shootings - rugby-) maybe with a teleconverter x2

but I want a lower range to match this one above
06-26-2014, 01:40 PM   #8
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QuoteOriginally posted by savoche Quote
What is it you want to do that your current lenses can't do for you? I'm not sure I'd get another zoom with what you have, but then not everybody like using primes...
Yeah, I would suggest you think about the DA 50mm f1.8. That will give you a big boost in terms of low light performance and overall quality.

06-26-2014, 02:22 PM   #9
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QuoteOriginally posted by diegopd Quote
Now I have:

Tamron 18-200 f/3.5-5.6
SMC Pentax-F 35-80mm F4-5.6
SMC Pentax-F 100-300mm F4.5-5.6


In a few weeks I will buy the Tamron 70-200 f/2.8 (for sports shootings - rugby-) maybe with a teleconverter x2

but I want a lower range to match this one above
Thanks for the additional information. This really helps!


If you plan to use the lens as a second lens for sports, then the Tamron 28-75/2.8 is usually the choice (since you don't need to go wider than 28mm very often). You'll probably find you often use the 75mm end for sports.

But if it's for general use, then you want the Tamron 17-50/2.8 (or the similar Sigma), because the gap between 50mm and 70mm won't matter much, yet you'll really need the 17-28mm range sometimes. Any of these lenses (including the Tamron 70-200/2.8 you're about to buy) will give you a significant upgrade in terms of capability and IQ over everything you currently have.


The 17-70 can still be considered if you're OK with having an f/4 lens much of the time, but I think you'll really appreciate having a constant f/2.8 instead.
06-26-2014, 02:36 PM   #10
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QuoteOriginally posted by diegopd Quote
[can't edit or delete previous message]

Now I have:

Tamron 18-200 f/3.5-5.6
SMC Pentax-F 35-80mm F4-5.6
SMC Pentax-F 100-300mm F4.5-5.6


In a few weeks I will buy the Tamron 70-200 f/2.8 (for sports shootings - rugby-) maybe with a teleconverter x2

but I want a lower range to match this one above
If you want to match the IQ of that 70-200 you're getting, then you can go with any of the ones you've listed, other than the Sigma 17-70, which will be a step down. There is also a Sigma 24-70/2.8 which is commonly paired with 70-200's, though this is usually a lens set considered to be more appropriate for full-frame cameras. I've had a few 16/18-50 zooms and just never cared for the range. I bought the 24-70 and find it to be much more comfortable for me, even on aps-c. If I think I may need something wider on an outing I just stick the DA15 in my pocket, but even I am surprised at how often 24 seems to be wide enough. It's an awesome range for event photography, my main use for it. None of the 17-70's can match it's IQ or it's speed. It ain't cheap, though. Bit on the large side, too.
06-26-2014, 05:12 PM   #11
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I can vouch for the Tamron 17-50. Sometimes you need it that wide, and the IQ is good.
06-26-2014, 05:59 PM   #12
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I don't use my 17-50 Tammy as much as I used to, but it's a great lens!
06-26-2014, 11:05 PM   #13
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if you're getting the 70-200 f2.8, then either get the sigma 24-70 f2.8, 17-50 f2.8 or the 17-70 f2.8-4. personally id go for the 17-50. But i do suggest selling you're other lenses to fund for the purchase of these 2. after buying those, i believe you're done with zooms and start considering some primes. the convenience of carrying a smaller and lighter lens matched with the sharpness and low light capabilities is so worth it. i started off with zooms and believed they were the correct choice due to the flexibility, but after buying my first primes, i know that at some point i will only be left with prime lenses and my smc 18-135 as my only zoom.
06-27-2014, 07:34 AM   #14
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thanks a lot for all your help.

Is there any difference between this 2 in the light that enters as Sigma has 77mm and Tamron 67mm for the filter size, or this realy doesn't matter at all between them?
- Sigma 17-50mm f/2.8 EX DC HSM Zoom Lens [USD 519]
- Tamron AF016P-700 SP AF17-50mm F/2.8 Di II LD Aspherical (IF) Lens with Hood [USD 302]
06-27-2014, 08:03 AM   #15
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I purchased the Sigma 17-70 contemporary in Feb. and so far, it has not disappointed.
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