SIGMA 10-20mm CLUB

JinDesu · 02-08-2012, 09:09 AM

I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better.

Designosophy · 02-08-2012, 09:39 AM

Originally posted by JinDesu

I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better.

On my K-5, I get the best results around f/11 and f/13. f/16 is also fine. The higher I go, the better the corners are. Center sharpness is great even wide open.

Jewelltrail · 02-08-2012, 10:40 PM

Originally posted by JinDesu

I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better.

Huh??? F/8 is the obvious point @ which APS-c diffraction sets in--ON ALL LENSES! The Sigma 10-20 (f/4-5.6 version, especially) is at its best. or dam close enough to it, @ 10mm (MTF scores @ 10mm & 14mm are too close to call)--this is some of the magic of the lens.

And Mr Designosophy is correct, corners are best starting @ f/11, continuing to f/13. Sophy=wisdom btw.

It is simply amazing what this lens can do @ 10mm, particularly when you look at its production date.

JT

riff · 02-08-2012, 10:47 PM - **1 Like**

Originally posted by Jewelltrail

It is simply amazing what this lens can do @ 10mm

Indeed, as this thread so amply demonstrates. This lens club thread has had the highest number of 'likes" of all lens clubs for months though far from the highest number of posts. Light goes in magic comes out.

thebigcat · 02-09-2012, 11:30 AM - **3 Likes**

Here's a couple.

captainbert · 02-11-2012, 06:03 PM - **2 Likes**

Originally posted by thebigcat

Here's a couple.

Love these..in particular the black and white street shot is beautifully atmospheric. Nice one!

Here's one from the beach yesterday shot at 14mm.

captainbert · 02-11-2012, 06:05 PM

Originally posted by drivingback

One of my shots today, didn't sharpen it after resizing as the details of the buildings were getting some artifacts. I just cropped a part of the left side.

ISO: 200
Shutter: 11s
Aperture: f11
Focal Length: 14mm

Nice sharp shot! Very cool image indeed

pinholecam · 02-11-2012, 07:01 PM - **2 Likes**

K5; Sigma 10-20

A reservoir near my place.

pinholecam · 02-11-2012, 07:18 PM

Originally posted by drivingback

One of my shots today, didn't sharpen it after resizing as the details of the buildings were getting some artifacts. I just cropped a part of the left side.

ISO: 200
Shutter: 11s
Aperture: f11
Focal Length: 14mm

Nice one!
I've never seen one shot from this location before.
BTW, if you are in SGP, you might want to check out the local Pentax group and forum.
Pentax
They have a monthly outing too.

drivingback · 02-11-2012, 09:46 PM

Originally posted by captainbert

Love these..in particular the black and white street shot is beautifully atmospheric. Nice one!

Here's one from the beach yesterday shot at 14mm.

I love the tones! Beautiful!

Originally posted by captainbert

Nice sharp shot! Very cool image indeed

Thank you very much!

Originally posted by pinholecam

K5; Sigma 10-20

A reservoir near my place.

Wow! Great photo of the Lower Pierce! Yes I am here in SGP, I will think about the group as I rarely have time to focus on photography much more to dedicate time in a group.

captainbert · 02-12-2012, 11:17 AM

Thanks a lot Drivingback!

kengoh · 02-12-2012, 11:29 AM

Originally posted by pinholecam

K5; Sigma 10-20

A reservoir near my place.

Nice shot JK.

kengoh · 02-12-2012, 11:30 AM

Some shots from holiday.

mark lj · 02-12-2012, 12:23 PM

Looking through this thread and I'm regretting swapping to the 12-24. Most of my favourites were all with this lens.

mikeSF · 02-12-2012, 10:45 PM - **3 Likes**

here is one from last night at 10mm

Davenport Moonshine

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
SIGMA 8-16mm CLUB	ManhattanProject	Lens Clubs	867	08-30-2023 07:08 AM
For Sale - Sold: Pentax AF-540FGZ Flash, Sigma 10-20mm F4-5.6, Sigma 170-500mm F5-6.3	davebest	Sold Items	12	06-25-2009 02:48 PM
For Sale - Sold: Pentax Lens Blowout; 50mm 1.4, Sigma 10-20mm, Sigma 400mm, etc.	nufenstein	Sold Items	13	03-30-2009 12:00 PM

02-08-2012, 09:09 AM	#1996
JinDesu Veteran Member Join Date: Jun 2011 Location: New York City Photos: Gallery Posts: 5,638	I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better.

02-08-2012, 09:39 AM	#1997
Designosophy Veteran Member Join Date: Sep 2010 Location: Northeast Philadelphia Photos: Gallery \| Albums Posts: 1,137	Originally posted by JinDesu I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better. On my K-5, I get the best results around f/11 and f/13. f/16 is also fine. The higher I go, the better the corners are. Center sharpness is great even wide open.

02-08-2012, 10:40 PM	#1998
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180 Original Poster	Originally posted by JinDesu I think F8 is the limit of sharpness on that lens, so shooting smaller than F8 isn't going to get you better sharpness. The lens does well from 12mm-20mm, it's the 10mm that is the weakest. Designosophy touched on an important part when trying to compare 100% crops from an 18mm lens to a 10mm lens. Maybe try shooting at 18mm and compre the two and I'm pretty sure that the Sigma will do better. Huh??? F/8 is the obvious point @ which APS-c diffraction sets in--ON ALL LENSES! The Sigma 10-20 (f/4-5.6 version, especially) is at its best. or dam close enough to it, @ 10mm (MTF scores @ 10mm & 14mm are too close to call)--this is some of the magic of the lens. And Mr Designosophy is correct, corners are best starting @ f/11, continuing to f/13. Sophy=wisdom btw. It is simply amazing what this lens can do @ 10mm, particularly when you look at its production date. JT

02-08-2012, 10:47 PM - 1 Like	#1999
riff Veteran Member Join Date: Jun 2011 Photos: Albums Posts: 1,408	Originally posted by Jewelltrail It is simply amazing what this lens can do @ 10mm Indeed, as this thread so amply demonstrates. This lens club thread has had the highest number of 'likes" of all lens clubs for months though far from the highest number of posts. Light goes in magic comes out.

02-09-2012, 11:30 AM - 3 Likes	#2000
thebigcat Forum Member Join Date: Feb 2011 Location: Chicago Posts: 95	Here's a couple.

02-11-2012, 06:03 PM - 2 Likes	#2001
captainbert Veteran Member Join Date: Dec 2011 Location: Derry Photos: Gallery \| Albums Posts: 776	Originally posted by thebigcat Here's a couple. Love these..in particular the black and white street shot is beautifully atmospheric. Nice one! Here's one from the beach yesterday shot at 14mm.

02-11-2012, 06:05 PM	#2002
captainbert Veteran Member Join Date: Dec 2011 Location: Derry Photos: Gallery \| Albums Posts: 776	Originally posted by drivingback One of my shots today, didn't sharpen it after resizing as the details of the buildings were getting some artifacts. I just cropped a part of the left side. ISO: 200 Shutter: 11s Aperture: f11 Focal Length: 14mm Nice sharp shot! Very cool image indeed

02-11-2012, 07:01 PM - 2 Likes	#2003
pinholecam Pentaxian Join Date: Oct 2009 Location: North Photos: Gallery Posts: 4,709	K5; Sigma 10-20 A reservoir near my place.

02-11-2012, 07:18 PM	#2004
pinholecam Pentaxian Join Date: Oct 2009 Location: North Photos: Gallery Posts: 4,709	Originally posted by drivingback One of my shots today, didn't sharpen it after resizing as the details of the buildings were getting some artifacts. I just cropped a part of the left side. ISO: 200 Shutter: 11s Aperture: f11 Focal Length: 14mm Nice one! I've never seen one shot from this location before. BTW, if you are in SGP, you might want to check out the local Pentax group and forum. Pentax They have a monthly outing too.

02-11-2012, 09:46 PM	#2005
drivingback Senior Member Join Date: Feb 2011 Location: Philippines Photos: Gallery Posts: 182	Originally posted by captainbert Love these..in particular the black and white street shot is beautifully atmospheric. Nice one! Here's one from the beach yesterday shot at 14mm. I love the tones! Beautiful! Originally posted by captainbert Nice sharp shot! Very cool image indeed Thank you very much! Originally posted by pinholecam K5; Sigma 10-20 A reservoir near my place. Wow! Great photo of the Lower Pierce! Yes I am here in SGP, I will think about the group as I rarely have time to focus on photography much more to dedicate time in a group.

02-12-2012, 11:17 AM	#2006
captainbert Veteran Member Join Date: Dec 2011 Location: Derry Photos: Gallery \| Albums Posts: 776	Thanks a lot Drivingback!

02-12-2012, 11:29 AM	#2007
kengoh Pentaxian Join Date: Oct 2010 Location: Singapore Photos: Gallery \| Albums Posts: 2,788	Originally posted by pinholecam K5; Sigma 10-20 A reservoir near my place. Nice shot JK.

02-12-2012, 11:30 AM	#2008
kengoh Pentaxian Join Date: Oct 2010 Location: Singapore Photos: Gallery \| Albums Posts: 2,788	Some shots from holiday.

02-12-2012, 12:23 PM	#2009
mark lj Veteran Member Join Date: Sep 2011 Photos: Gallery Posts: 983	Looking through this thread and I'm regretting swapping to the 12-24. Most of my favourites were all with this lens.

02-12-2012, 10:45 PM - 3 Likes	#2010
mikeSF Pentaxian Join Date: Jan 2009 Location: East Bay Area, CA Photos: Gallery Posts: 6,622	here is one from last night at 10mm Davenport Moonshine