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12-18-2006, 07:31 AM   #1
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Sigma lens

I've been looking for a sigma 17-70 f2.8 4.5 and found a 24-70 f2.8.
I'm a bit confused is it better to have a straight f-stop on one or one that that will change like the one from 2.8-4.5. Im looking for a walk around lens to take landscape and people and all things.

Thank for any help.

12-18-2006, 09:27 AM   #2
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Depends on budget and end use. The constant f/2.8 lens is more expensive but gives a couple stops more exposure range at the long end--a real plus for shots like those in sports or when low light shooting.

In addition to cost, they typically weigh considerably more. Some might argue that the constant f-stop lens is also better made.

What works for your needs is what is best for you.
12-18-2006, 03:10 PM   #3
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I have been using the 24 - 70 f2.8 for the past 12 months on a DS, with great results. only issue is that you can't use the oboard flash with this lens, as it porduces a shadow on the bottom of the picture.
12-19-2006, 07:04 AM   #4
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there's also a world of difference between 17mm and 24mm. if doing landscapes i think you would probably like the 17-70 for it's wider advantage.

12-19-2006, 10:58 AM   #5
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Easy - If you need f/2.8 at 70mm, get the 24-70mm. If you need 17mm, get the 17-70. If you need 17mm and f/2.8 at the long end, doah! That's one of the trade offs in life. I just got the Tamron 28-75mm f/2.8. I love it! I still have the kit lens for the wide angle. I have no problem changing lenses often. It's part of the fun of DSLRs
12-19-2006, 02:46 PM   #6
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I bought the 17-70 after a long struggle on which lens to buy. I think it is a great lens so far, but if you want to do indoor work with no flash, I would encourage you to go for the 2.8 constant. You can hand hold the 17-70 in indoor shots and still get a sharp photo, but if your subject move even a little bit they will either very soft or completely blurry, depending on the light.
If you don't need the lens for this, then I would get the 17-70 for a walk around lens as it is more versitile, a bit cheaper, and sharp. At 70mm it makes a great candid portriat lens. (I ran out of money so that was also a major factor in my decision not to go for the 2.8)
what I am eventually going to do is get a pentax 77mm limited or a 50mm prime to use for no flash indoor work.

good luck

randy
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