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09-28-2011, 03:42 PM   #1
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upgrading lens from pentax 18-55 to sigma 17-70

I have purchased a K-r with a 18-55 lens and was thinking of upgrading to a Sigma 17-70 lens. Is there enough difference between the two lenses to justify the expense? I am a basic photographer, nothing professional about me, (old cars, planes, family pets, kids and bugs!) basic stuff! I also already have a Pentax 100-300 for fun.

Can someone please give me an opinion without steering me towards a different lens costing $1000 or more!


09-28-2011, 04:42 PM   #2

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Please do not post the same issue/question in multiple threads. Electrons (and photons) are getting more and more expensive these days....

I suggest unless you have an urgent need for a particular lens, use the kit lens while you learn to know the camera and more importantly, yourself. Then it's not too late to acquire more toys.
09-28-2011, 04:47 PM   #3
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I would say yes, as you'll also be able to shoot in lower light.

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09-28-2011, 04:54 PM   #4
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I would say yes, as you'll also be able to shoot in lower light.
It's only a stop difference at the long end - not really a low-light wonder :-) Possibly more importantly, it has a better focal length range (wider and longer) and a bit better IQ.

09-28-2011, 04:57 PM   #5
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No matter what others say, the point is whether YOU will be able to notice the difference. If you are a "basic photographer" you are most likely to do that if you get a much faster lens:

Tamron 17-50 f2.8 or the Tamron 28-75 f2.8 if you don't need the wider end. They are not very expensive and will be an upgrade from the kit lens.
09-28-2011, 05:16 PM   #6
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Yup, I agree with psychdoc. The Sigma 17-70 is probably better (in IQ) than the kit lens, but if you really want something better then go with either of those tamrons. That way you'll get a much faster lens (this makes a big difference in low light).

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