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robert · 01-28-2016, 02:13 PM

Bought this lens a couple years ago thinking it might be a decent landscape lens on my K01. After testing it along side my Pentax DA 16-45 zoom I find it not to be as sharp at 24mm as on my zoom. Tested at several different lens openings. Did I just get a bad copy?

Jonathan Mac · 01-28-2016, 02:22 PM

I had the old manual focus version and now I have the newer AF one and both are very sharp wide open. If your isn't then it's either a bad copy or mis-focusing.

seventysixersfan · 01-28-2016, 02:27 PM

My AF sigma 24mm superwide II is very sharp. However, the DA 16-45 zoom is also quite sharp for a zoom, so the images you get from the zoom versus the prime might be fairly close

**dadipentak** · 01-28-2016, 03:24 PM

Mine is quite sharp.

osv · 01-28-2016, 03:35 PM

i've had at least five of those lenses, it's a sharp piece of glass, but prone to decentering.

were you using af?

post up a *full size* pic that you don't like, get some feedback from people.

robert · 01-28-2016, 04:14 PM

Originally posted by osv

i've had at least five of those lenses, it's a sharp piece of glass, but prone to decentering.

were you using af?

post up a *full size* pic that you don't like, get some feedback from people.

No it's a manual focus model

osv · 01-28-2016, 04:30 PM - **1 Like**

did you use live view to focus the pics?

check out the test photo for this lens on the a7r, blow it up to 100% view, you can see the decentering issues, but it's always sharp in the center: 24mm lens sample variation: Three Sigma 24mm lens and three Canon FDn 24mm lenses compared

if you can't achieve center sharpness by f/5.6 or so, using live view, i'd try shining a flashlight into the lens, and see if it's hazy or something.

**Just1MoreDave** · 01-28-2016, 07:45 PM

Mine is sharper than my DA 16-45 at 24mm. You could have an exceptional DA 16-45.

yusuf · 01-30-2016, 10:42 PM

Originally posted by osv

did you use live view to focus the pics?

check out the test photo for this lens on the a7r, blow it up to 100% view, you can see the decentering issues, but it's always sharp in the center: 24mm lens sample variation: Three Sigma 24mm lens and three Canon FDn 24mm lenses compared

nice info, thanks for sharing. In my test, I found Sigma 24mm to be a sharp lens (at least sharper than Pentax A24 and M24-35).

01-28-2016, 02:13 PM	#1
robert Veteran Member Join Date: Jan 2007 Location: ohio Posts: 336	Sigma 24mm. f2.8 Superwide 2 not sharp. Bought this lens a couple years ago thinking it might be a decent landscape lens on my K01. After testing it along side my Pentax DA 16-45 zoom I find it not to be as sharp at 24mm as on my zoom. Tested at several different lens openings. Did I just get a bad copy?

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01-28-2016, 02:22 PM	#2
Jonathan Mac Pentaxian Join Date: Apr 2009 Location: Madrid, Spain Posts: 10,911	I had the old manual focus version and now I have the newer AF one and both are very sharp wide open. If your isn't then it's either a bad copy or mis-focusing.

01-28-2016, 02:27 PM	#3
seventysixersfan Pentaxian Join Date: Aug 2010 Location: Alexandria, VA Posts: 2,054	My AF sigma 24mm superwide II is very sharp. However, the DA 16-45 zoom is also quite sharp for a zoom, so the images you get from the zoom versus the prime might be fairly close

01-28-2016, 03:24 PM	#4
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Mine is quite sharp.

01-28-2016, 03:35 PM	#5
osv Veteran Member Join Date: Mar 2007 Location: So Cal Photos: Gallery Posts: 2,080	i've had at least five of those lenses, it's a sharp piece of glass, but prone to decentering. were you using af? post up a full size pic that you don't like, get some feedback from people.

01-28-2016, 04:14 PM	#6
robert Veteran Member Join Date: Jan 2007 Location: ohio Posts: 336 Original Poster	Originally posted by osv i've had at least five of those lenses, it's a sharp piece of glass, but prone to decentering. were you using af? post up a full size pic that you don't like, get some feedback from people. No it's a manual focus model

01-28-2016, 04:30 PM - 1 Like	#7
osv Veteran Member Join Date: Mar 2007 Location: So Cal Photos: Gallery Posts: 2,080	did you use live view to focus the pics? check out the test photo for this lens on the a7r, blow it up to 100% view, you can see the decentering issues, but it's always sharp in the center: 24mm lens sample variation: Three Sigma 24mm lens and three Canon FDn 24mm lenses compared if you can't achieve center sharpness by f/5.6 or so, using live view, i'd try shining a flashlight into the lens, and see if it's hazy or something.

01-28-2016, 07:45 PM	#8
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	Mine is sharper than my DA 16-45 at 24mm. You could have an exceptional DA 16-45.

01-30-2016, 10:42 PM	#9
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Originally posted by osv did you use live view to focus the pics? check out the test photo for this lens on the a7r, blow it up to 100% view, you can see the decentering issues, but it's always sharp in the center: 24mm lens sample variation: Three Sigma 24mm lens and three Canon FDn 24mm lenses compared nice info, thanks for sharing. In my test, I found Sigma 24mm to be a sharp lens (at least sharper than Pentax A24 and M24-35).

Sigma 24mm. f2.8 Superwide 2 not sharp.

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