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jgredline · 01-27-2008, 02:22 PM

Hi Folks.
For those of you who own this lens,
Sigma | 17-70mm f/2.8-4.5 DC Macro Lens for Pentax | 669109
at what focal length does it go from F/2.8 to 3.5 and so forth...I am thinking about getting this lens for my back up system.

AprilFool · 01-27-2008, 02:55 PM

17-20mm f/2.8
21-24mm f/3.2
24-34mm f/3.5
35-54mm f/4.0
55-70mm f/4.5

This is from Sigma DC 17-70mm f/2.8-4.5 Test Report Photo Gallery by jimcreek at pbase.com . I hope it is correct.

pop4 · 01-27-2008, 03:22 PM

With mine, the values are roughly:

F2.8 - 17-21mm
F3.5 - 23-34mm
F4.0 - 34-70mm
F4.5 - 70mm

jgredline · 01-27-2008, 03:45 PM

Wow
This lens really sounds like the ticket...Is it sharp down at f/2.8?

pw-pix · 01-27-2008, 08:43 PM

I've not seen anything that I'd call unsharp from mine.
I haven't done any formal testing, but it seems like a good lens to me.

jgredline · 01-27-2008, 09:38 PM

I will be ordering one tomorrow.
Thanks folks.

AprilFool · 01-28-2008, 10:05 AM

I love this lens and it certainly is a great value for the money.

calicojack · 01-28-2008, 05:58 PM

Originally posted by jgredline

I will be ordering one tomorrow.
Thanks folks.

Feel Good about your decision. It's a great lens.

Stratman · 01-28-2008, 06:37 PM

Would the owners of this lens call it a BIG improvement over the kit lens? I have been pondering getting this lens too, or maybe Sigmas 18-50 F2.8

kenyee · 01-28-2008, 06:55 PM

Yep, it's big improvement over the kit lens (which isn't bad at all). The 17-70 has more contrast, is sharper, and focuses noticeably faster with better build quality.

01-27-2008, 02:22 PM	#1
jgredline Veteran Member Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,628	Sigma 17-70 tech question Hi Folks. For those of you who own this lens, Sigma \| 17-70mm f/2.8-4.5 DC Macro Lens for Pentax \| 669109 at what focal length does it go from F/2.8 to 3.5 and so forth...I am thinking about getting this lens for my back up system.

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01-27-2008, 02:55 PM	#2
AprilFool Junior Member Join Date: Apr 2007 Location: Slovenija Photos: Gallery Posts: 34	17-20mm f/2.8 21-24mm f/3.2 24-34mm f/3.5 35-54mm f/4.0 55-70mm f/4.5 This is from Sigma DC 17-70mm f/2.8-4.5 Test Report Photo Gallery by jimcreek at pbase.com . I hope it is correct.

01-27-2008, 03:22 PM	#3
pop4 Veteran Member Join Date: Aug 2007 Location: YMML Photos: Gallery Posts: 1,879	With mine, the values are roughly: F2.8 - 17-21mm F3.5 - 23-34mm F4.0 - 34-70mm F4.5 - 70mm

01-27-2008, 03:45 PM	#4
jgredline Veteran Member Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,628 Original Poster	Wow This lens really sounds like the ticket...Is it sharp down at f/2.8?

01-27-2008, 08:43 PM	#5
pw-pix Senior Member Join Date: Oct 2007 Location: Geelong Photos: Gallery Posts: 138	I've not seen anything that I'd call unsharp from mine. I haven't done any formal testing, but it seems like a good lens to me.

01-27-2008, 09:38 PM	#6
jgredline Veteran Member Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,628 Original Poster	I will be ordering one tomorrow. Thanks folks.

01-28-2008, 10:05 AM	#7
AprilFool Junior Member Join Date: Apr 2007 Location: Slovenija Photos: Gallery Posts: 34	I love this lens and it certainly is a great value for the money.

01-28-2008, 05:58 PM	#8
calicojack Inactive Account Join Date: Mar 2007 Location: Long Island, N.Y. Photos: Gallery Posts: 1,124	Originally posted by jgredline I will be ordering one tomorrow. Thanks folks. Feel Good about your decision. It's a great lens.

01-28-2008, 06:37 PM	#9
Stratman Veteran Member Join Date: Mar 2007 Location: St Louis, Missouri U S A Photos: Gallery \| Albums Posts: 2,464	Would the owners of this lens call it a BIG improvement over the kit lens? I have been pondering getting this lens too, or maybe Sigmas 18-50 F2.8

01-28-2008, 06:55 PM	#10
kenyee Veteran Member Join Date: Mar 2007 Location: Boston, PRofMA Photos: Albums Posts: 3,026	Yep, it's big improvement over the kit lens (which isn't bad at all). The 17-70 has more contrast, is sharper, and focuses noticeably faster with better build quality.

Sigma 17-70 tech question

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