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**skid2964** · 11-05-2009, 01:50 PM

I cannot find the Sigma 50-150 f/2.8 in the lens review database.
How does it compare to the Pentax DA* 50-135 f/2.8?

kenyee · 11-05-2009, 02:30 PM

I think moving_comfort has the Sigma. IIRC, the Sigma is as sharp as the 50-135 up to 135 but is less sharp between 135 and 150...

bonovox · 11-05-2009, 02:39 PM

I swapped my 70-200mm for the 50-150mm (mostly to save on size/weight), and have been really happy with it.

I've never owned a 50-135mm so can't compare, nor do I do objective pixel-peeping tests of my lenses - so my opinion is very subjective.

But I am happy with how sharp it is through out the range - though usually stopped down a bit (f4) when at 150mm if I want it tack sharp.

PNTXFTW12 · 11-05-2009, 02:41 PM

Originally posted by kenyee

I think moving_comfort has the Sigma. IIRC, the Sigma is as sharp as the 50-135 up to 135 but is less sharp between 135 and 150...

how does that even make sense?
by saying "less sharp than the 50-135 lens between 135-150mm", you're comparing the sharpness of a focal range that the Pentax lens can't even reach.

**skid2964** · 11-05-2009, 02:54 PM

Originally posted by PNTXFTW12

how does that even make sense?
by saying "less sharp than the 50-135 lens between 135-150mm", you're comparing the sharpness of a focal range that the Pentax lens can't even reach.

I took that to mean the 135-150 range on the Sigma is less sharp than IT's OWN 50-135 range focal range. Yet, still as sharp as the Pentax in the focal range it does share.

filorp · 11-05-2009, 06:16 PM

i'v heard that sigmas AF is much worse then DA* reg acuracy, and its slower than 70-200... is this true?

vinceloc · 11-05-2009, 08:20 PM

Originally posted by filorp

i'v heard that sigmas AF is much worse then DA* reg acuracy, and its slower than 70-200... is this true?

I've heard the complete opposite. Sigma's HSM is faster and more accurate than Pentax's SDM.

jsherman999 · 11-05-2009, 08:47 PM

Originally posted by skid2964

I cannot find the Sigma 50-150 f/2.8 in the lens review database.
How does it compare to the Pentax DA* 50-135 f/2.8?

.

Hi - check out This Thread!

.

Mike.P® · 11-06-2009, 08:26 AM

I have both. I bought the 50-150mm just to see if there was much difference.
IMO the Pentax lens wins on IQ and weather sealing but the Sigma has faster AF .. and the IQ is not far behind if I'm honest.

The Sigma is currently on Ebay.

This was taken with the 50-150mm on my K10D wide open at f2.8

11-05-2009, 01:50 PM	#1
skid2964 Site Supporter Join Date: May 2008 Location: USA Posts: 611	Sigma 50-150 and Pentax 50-135 I cannot find the Sigma 50-150 f/2.8 in the lens review database. How does it compare to the Pentax DA* 50-135 f/2.8?

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11-05-2009, 02:30 PM	#2
kenyee Veteran Member Join Date: Mar 2007 Location: Boston, PRofMA Photos: Albums Posts: 3,026	I think moving_comfort has the Sigma. IIRC, the Sigma is as sharp as the 50-135 up to 135 but is less sharp between 135 and 150...

11-05-2009, 02:39 PM	#3
bonovox Inactive Account Join Date: Jul 2007 Location: Ireland's wild west Posts: 555	I swapped my 70-200mm for the 50-150mm (mostly to save on size/weight), and have been really happy with it. I've never owned a 50-135mm so can't compare, nor do I do objective pixel-peeping tests of my lenses - so my opinion is very subjective. But I am happy with how sharp it is through out the range - though usually stopped down a bit (f4) when at 150mm if I want it tack sharp.

11-05-2009, 02:41 PM	#4
PNTXFTW12 Senior Member Join Date: Oct 2008 Location: Vaughan, Ontario Photos: Gallery Posts: 269	Originally posted by kenyee I think moving_comfort has the Sigma. IIRC, the Sigma is as sharp as the 50-135 up to 135 but is less sharp between 135 and 150... how does that even make sense? by saying "less sharp than the 50-135 lens between 135-150mm", you're comparing the sharpness of a focal range that the Pentax lens can't even reach.

11-05-2009, 02:54 PM	#5
skid2964 Site Supporter Join Date: May 2008 Location: USA Posts: 611 Original Poster	Originally posted by PNTXFTW12 how does that even make sense? by saying "less sharp than the 50-135 lens between 135-150mm", you're comparing the sharpness of a focal range that the Pentax lens can't even reach. I took that to mean the 135-150 range on the Sigma is less sharp than IT's OWN 50-135 range focal range. Yet, still as sharp as the Pentax in the focal range it does share.

11-05-2009, 06:16 PM	#6
filorp Veteran Member Join Date: Jun 2008 Location: Aberdeen Scotland Photos: Gallery \| Albums Posts: 398	i'v heard that sigmas AF is much worse then DA* reg acuracy, and its slower than 70-200... is this true?

11-05-2009, 08:20 PM	#7
vinceloc Pentaxian Join Date: Jul 2007 Location: Philippines Photos: Gallery Posts: 367	Originally posted by filorp i'v heard that sigmas AF is much worse then DA* reg acuracy, and its slower than 70-200... is this true? I've heard the complete opposite. Sigma's HSM is faster and more accurate than Pentax's SDM.

11-05-2009, 08:47 PM	#8
jsherman999 Veteran Member Join Date: Dec 2007 Photos: Gallery Posts: 8,237	Originally posted by skid2964 I cannot find the Sigma 50-150 f/2.8 in the lens review database. How does it compare to the Pentax DA* 50-135 f/2.8? . Hi - check out This Thread! .

11-06-2009, 08:26 AM	#9
Mike.P® Pentaxian Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,108	I have both. I bought the 50-150mm just to see if there was much difference. IMO the Pentax lens wins on IQ and weather sealing but the Sigma has faster AF .. and the IQ is not far behind if I'm honest. The Sigma is currently on Ebay. This was taken with the 50-150mm on my K10D wide open at f2.8

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Sigma 50-150 and Pentax 50-135

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