Pentax 50-135mm vs. Sigma 50-150mm

jms698 · 05-05-2009, 09:50 PM

Sigma | 50-150mm f/2.8 II EX DC HSM Lens for Pentax | 691-109

Pentax | SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus | 21660

I'm trying to decide which of these two lenses to get.

Dimensions are the same, price is the same.
Pentax has weather sealing, Sigma doesn't.
Sigma weighs 100g more.
Sigma has 15 more mm at the long end.

Does anyone have experience with these lenses? How does the AF speed and image quality compare?

jsherman999 · 05-05-2009, 10:10 PM

Originally posted by jms698

Sigma | 50-150mm f/2.8 II EX DC HSM Lens for Pentax | 691-109

Pentax | SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus | 21660

I'm trying to decide which of these two lenses to get.

Dimensions are the same, price is the same.
Pentax has weather sealing, Sigma doesn't.
Sigma weighs 100g more.
Sigma has 15 more mm at the long end.

Does anyone have experience with these lenses? How does the AF speed and image quality compare?

Here's a ---> thread where I discuss these two lenses.

Summary: both are excellent, but on Pentax, the DA* 50-135 is the better choice due to a slight sharpness advantage throughout the range, especially in close-focus at 135mm+ wide open. The 15mm FL advantage on the long end makes almost no difference.

.

James S · 05-06-2009, 01:24 AM

If you shop around you can save about $250-500 buying the Sigma. Perhaps that is worth buying at that price, rather than that much more for SDM?

alehel · 05-06-2009, 02:25 AM

Incidently, the Sigma has HSM, which as far as I've understood is more or less the same as SDM.

James S · 05-06-2009, 03:02 AM

Oh, sorry, I was thinking about the original 50-150, not the new one with HSM.

In Oz the 50-150 is $1300, the 50-135 is $1599. It's probably up to personal choice then.

05-05-2009, 09:50 PM	#1
jms698 Senior Member Join Date: Jul 2007 Location: Wellington, New Zealand Posts: 133	Pentax 50-135mm vs. Sigma 50-150mm Sigma \| 50-150mm f/2.8 II EX DC HSM Lens for Pentax \| 691-109 Pentax \| SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus \| 21660 I'm trying to decide which of these two lenses to get. Dimensions are the same, price is the same. Pentax has weather sealing, Sigma doesn't. Sigma weighs 100g more. Sigma has 15 more mm at the long end. Does anyone have experience with these lenses? How does the AF speed and image quality compare?

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05-05-2009, 10:10 PM	#2
jsherman999 Veteran Member Join Date: Dec 2007 Photos: Gallery Posts: 8,237	Originally posted by jms698 Sigma \| 50-150mm f/2.8 II EX DC HSM Lens for Pentax \| 691-109 Pentax \| SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus \| 21660 I'm trying to decide which of these two lenses to get. Dimensions are the same, price is the same. Pentax has weather sealing, Sigma doesn't. Sigma weighs 100g more. Sigma has 15 more mm at the long end. Does anyone have experience with these lenses? How does the AF speed and image quality compare? Here's a ---> thread where I discuss these two lenses. Summary: both are excellent, but on Pentax, the DA* 50-135 is the better choice due to a slight sharpness advantage throughout the range, especially in close-focus at 135mm+ wide open. The 15mm FL advantage on the long end makes almost no difference. .

05-06-2009, 01:24 AM	#3
James S Guest	If you shop around you can save about $250-500 buying the Sigma. Perhaps that is worth buying at that price, rather than that much more for SDM?

05-06-2009, 02:25 AM	#4
alehel Senior Member Join Date: Apr 2009 Posts: 167	Incidently, the Sigma has HSM, which as far as I've understood is more or less the same as SDM.

05-06-2009, 03:02 AM	#5
James S Guest	Oh, sorry, I was thinking about the original 50-150, not the new one with HSM. In Oz the 50-150 is $1300, the 50-135 is $1599. It's probably up to personal choice then.

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