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qtopplings · 01-03-2011, 05:58 PM

I've seen some good pictures posted in the Tamron club thread, so I'm sure there are some good copies out there. But what I've noticed is a lot of those look cropped...

The first Sigma was perfect, so why deal with returning a lens over and over. I think the overall body of evidence supports the superiority of the Sigma. I might have tried to justify the Tamron based on price, but it is clear that its just not a great lens.

**Ash** · 01-03-2011, 07:07 PM

Originally posted by qtopplings

The first Sigma was perfect, so why deal with returning a lens over and over. I think the overall body of evidence supports the superiority of the Sigma. I might have tried to justify the Tamron based on price, but it is clear that its just not a great lens.

Because the lens can be worth it.
Good IQ, plus an added 4mm of focal range may be attractive to some.

I went through 3 copies of the Tamron 70-200/2.8 until I finally got a good one (aftern it had to be repaired!) because I know how good it is - and there's no Pentax lens available in production that has its versatility, IQ and speed for the focal lengths.

yusuf · 01-03-2011, 08:04 PM

Not sure why, but even Sigma pictures in above set does not appears to be sharp.

**Ash** · 01-03-2011, 08:46 PM

Originally posted by yusuf

Not sure why, but even Sigma pictures in above set does not appears to be sharp.

Choice of apertures for infinity distance focus landscapes - not optimal for sharpness throughout the frame.

SpecialK · 01-03-2011, 08:57 PM - **1 Like**

Just passing thorough as I like wide angles...

Interesting to see that the zoom rotation is the same direction, but the focus rings are reversed.

Not all Sigmas zoom in the same direction :-(

Jewelltrail · 01-03-2011, 09:22 PM

This is more like death by firing squad than it is a shootout. Pentaxor is right--even the Kit kills it.

More seriously, Sigma had some serious quality control issues with its 10-20 too. There are many shooters out there with excellent copies of the Tamron, so not too much should be made of this. When I bought my Sigma, though I got a good one on my first try, I was fully prepared to return a copy or two if need be.

Alan, the shots you posted with the lens in the Tamron 10-24 Club were better than these, by a lot. That lens had a bad lower right corner, which cleared uip a lot @ f8 and totally @ f11---this copy here has issues so serious that Tamron might want to take a close look at it. A lens this bad is a travesty--Tamron should be ashamed if you ask me. I would email the pics to them if I were you.

qtopplings · 01-03-2011, 10:13 PM

Originally posted by Ash

Choice of apertures for infinity distance focus landscapes - not optimal for sharpness throughout the frame.

I focused at the same point for all, did not use a tripod, and just changed the aperture. This was not a scientific, controlled test by any means. I wasn't going for perfect, but mostly to check the corners, and PF/CA on the tree branches. The light was also not great at around 1pm.

Jewelltrail · 01-03-2011, 10:33 PM

Quote:

qtopplings:This was not a scientific, controlled test by any means.

Agreed, there ws no need for science in this one.

Alizarine · 10-01-2015, 10:42 PM

thanks for comparisons like these, and on PF too! Great since I'm looking for an UWA lens and the OEM 12-24 is just beyond the budget right now

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01-03-2011, 05:58 PM	#16
qtopplings Senior Member Join Date: Nov 2009 Location: Marin, CA Photos: Gallery \| Albums Posts: 282 Original Poster	I've seen some good pictures posted in the Tamron club thread, so I'm sure there are some good copies out there. But what I've noticed is a lot of those look cropped... The first Sigma was perfect, so why deal with returning a lens over and over. I think the overall body of evidence supports the superiority of the Sigma. I might have tried to justify the Tamron based on price, but it is clear that its just not a great lens.

01-03-2011, 07:07 PM	#17
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Originally posted by qtopplings The first Sigma was perfect, so why deal with returning a lens over and over. I think the overall body of evidence supports the superiority of the Sigma. I might have tried to justify the Tamron based on price, but it is clear that its just not a great lens. Because the lens can be worth it. Good IQ, plus an added 4mm of focal range may be attractive to some. I went through 3 copies of the Tamron 70-200/2.8 until I finally got a good one (aftern it had to be repaired!) because I know how good it is - and there's no Pentax lens available in production that has its versatility, IQ and speed for the focal lengths.

01-03-2011, 08:04 PM	#18
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Not sure why, but even Sigma pictures in above set does not appears to be sharp.

01-03-2011, 08:46 PM	#19
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Originally posted by yusuf Not sure why, but even Sigma pictures in above set does not appears to be sharp. Choice of apertures for infinity distance focus landscapes - not optimal for sharpness throughout the frame.

01-03-2011, 08:57 PM - 1 Like	#20
SpecialK Pentaxian Join Date: Dec 2006 Location: So California Photos: Gallery Posts: 16,482	Just passing thorough as I like wide angles... Interesting to see that the zoom rotation is the same direction, but the focus rings are reversed. Not all Sigmas zoom in the same direction :-(

01-03-2011, 09:22 PM	#21
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180	This is more like death by firing squad than it is a shootout. Pentaxor is right--even the Kit kills it. More seriously, Sigma had some serious quality control issues with its 10-20 too. There are many shooters out there with excellent copies of the Tamron, so not too much should be made of this. When I bought my Sigma, though I got a good one on my first try, I was fully prepared to return a copy or two if need be. Alan, the shots you posted with the lens in the Tamron 10-24 Club were better than these, by a lot. That lens had a bad lower right corner, which cleared uip a lot @ f8 and totally @ f11---this copy here has issues so serious that Tamron might want to take a close look at it. A lens this bad is a travesty--Tamron should be ashamed if you ask me. I would email the pics to them if I were you.

01-03-2011, 10:13 PM	#22
qtopplings Senior Member Join Date: Nov 2009 Location: Marin, CA Photos: Gallery \| Albums Posts: 282 Original Poster	Originally posted by Ash Choice of apertures for infinity distance focus landscapes - not optimal for sharpness throughout the frame. I focused at the same point for all, did not use a tripod, and just changed the aperture. This was not a scientific, controlled test by any means. I wasn't going for perfect, but mostly to check the corners, and PF/CA on the tree branches. The light was also not great at around 1pm.

01-03-2011, 10:33 PM	#23
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180	Quote: qtopplings:This was not a scientific, controlled test by any means. Agreed, there ws no need for science in this one.

10-01-2015, 10:42 PM	#24
Alizarine Veteran Member Join Date: Dec 2010 Location: Manila Photos: Gallery \| Albums Posts: 2,185	thanks for comparisons like these, and on PF too! Great since I'm looking for an UWA lens and the OEM 12-24 is just beyond the budget right now

Sigma 10-20 vs Tamron 10-24, a shootout

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