Sigma 18-35mm F1.8 Coming for Pentax!

**Digitalis** · 09-19-2013, 05:46 PM

Originally posted by normhead

Do you guys honestly think you're going to walk around with a 2 pound lens around your neck?

I never use the camera strap, I always carry the camera in my hand - even with heavy lenses.

Originally posted by Mock

I prefer to have as many options as I can, which is why I don't mind having 18mm at f/1.8, especially when there is no penalty in IQ.

There will be a penalty - field curvature and coma.

Mock · 09-19-2013, 07:23 PM

Originally posted by Digitalis

There will be a penalty - field curvature and coma.

According to lenstip the DA 21 has worse coma than the 18-35 wide open, not that I have ever noticed a negative impact of this since I don't make photos of diodes.
Similarly, I've yet to encounter a situation where field curvature would cause an issue on any lens, because I don't make photos of brick walls.

Nothing is perfect.

I've just uploaded a new photo (at full resolution for Flickr members), typical wide angle subject taken at 18mm and f/1.8 for testing purposes, and it appears I was far enough back that infinity is in decent focus too.
At a regular viewing size you will see a bit of vignetting and distortion, which a lens profile would sort out with one click. Getting down to pixel peeper resolution it can be seen that the extreme left and right edges of the frame are soft - and if you look in the shadows you will see chroma noise because the Canon sensor/RAW file is awful for shadow recovery.

All that aside, and backing out to normal viewing size again, perhaps one could appreciate how surprisingly good this looks for a photo taken with a lens wide open (zoom or prime) at f/1.8.

SyncGuy · 09-25-2013, 07:30 PM

Originally posted by Mock

According to lenstip the DA 21 has worse coma than the 18-35 wide open, not that I have ever noticed a negative impact of this since I don't make photos of diodes.
Similarly, I've yet to encounter a situation where field curvature would cause an issue on any lens, because I don't make photos of brick walls.

Nothing is perfect.

I've just uploaded a new photo (at full resolution for Flickr members), typical wide angle subject taken at 18mm and f/1.8 for testing purposes, and it appears I was far enough back that infinity is in decent focus too.
At a regular viewing size you will see a bit of vignetting and distortion, which a lens profile would sort out with one click. Getting down to pixel peeper resolution it can be seen that the extreme left and right edges of the frame are soft - and if you look in the shadows you will see chroma noise because the Canon sensor/RAW file is awful for shadow recovery.

All that aside, and backing out to normal viewing size again, perhaps one could appreciate how surprisingly good this looks for a photo taken with a lens wide open (zoom or prime) at f/1.8.

Agreed! It's pretty darn good enough!

I mean, sure... Try doing that in low light, handheld with a 21/3.2 and see which one has a more useable shutter speed/iso..
At the end of the day, having a good and useable shot is 1000 times better than a non-useable mess of a blurry picture..

**dadipentak** · 09-25-2013, 07:36 PM

I intend to use this lens for indoor (mostly flashless) shooting--where it's strengths will be most useful and its weaknesses, less relevant.

Mock · 09-26-2013, 06:04 PM

Originally posted by SyncGuy

I mean, sure... Try doing that in low light, handheld with a 21/3.2 and see which one has a more useable shutter speed/iso..
At the end of the day, having a good and useable shot is 1000 times better than a non-useable mess of a blurry picture..

Precisely. As soon as we get in a Nikon-mount I can play with, the nights will be longer, and I will try to get out and do some urban night shooting with it. I recognize the slight absurdity in shooting a daytime landscape at f/1.8, but it was for science!

**Aristophanes** · 09-26-2013, 06:13 PM - **2 Likes**

Originally posted by Mock

Precisely. As soon as we get in a Nikon-mount I can play with, the nights will be longer, and I will try to get out and do some urban night shooting with it. I recognize the slight absurdity in shooting a daytime landscape at f/1.8, but it was for science!

Uh....

....around here photography is a religion.

Barry Pearson · 09-27-2013, 01:11 AM

Originally posted by Aristophanes

Uh....

....around here photography is a religion.

Photography is a mission! To risk life and limb to capture those pesky images and bring them back to base to be subjected to scrutiny.

Clavius · 09-27-2013, 02:17 AM

I thought photography was just collecting raw materials, of which you make something later on?

SyncGuy · 09-27-2013, 02:39 AM

Woah... Wait.......! Isn't photography all about turning into guinea pigs for the corporate companies via shooting brick walls and pixel peeping?!

Thomas.CS · 10-12-2013, 08:48 AM

Really thinking about this lens, I have the DA15 for when I want the really wide into-the-sun shots so flare shouldn't bother me too much. But for indoors, birthday parties, star shots and indoor/evening events this seems like an amazing lens.

Edgar_in_Indy · 10-12-2013, 09:22 AM

And I would love to take this lens with me to the hospital when my next child is born in June, so I'm keeping my fingers crossed that the Pentax-mount is conceived prior to that.

Thomas.CS · 10-12-2013, 09:51 AM

Originally posted by Edgar_in_Indy

And I would love to take this lens with me to the hospital when my next child is born in June, so I'm keeping my fingers crossed that the Pentax-mount is conceived prior to that.

My next is due in late march so I hope they are faster then that!

scole · 10-12-2013, 01:29 PM

Lately I've been thinking about picking up one of the Bower/Samyang/Rokinon fast wide primes for astrophotography but I completely forgot about this lens. It would certainly eliminate some of my indecision about selecting a focal length. Just wish they'd be more forthcoming about a release date for the Pentax version.

Mock · 10-12-2013, 02:11 PM

Originally posted by scole

Lately I've been thinking about picking up one of the Bower/Samyang/Rokinon fast wide primes for astrophotography but I completely forgot about this lens. It would certainly eliminate some of my indecision about selecting a focal length. Just wish they'd be more forthcoming about a release date for the Pentax version.

Nikon should finally be shipping next week (15th), and Sony is listed as "Mid-November", Pentax is still TBA.
I hope the Sony batch is a small one, so they can get underway with Pentax quickly. I've already resigned myself to the fact I won't have this for vacation at the end of this month.

scole · 10-24-2013, 06:45 AM

I know Sigma will be at PhotoPlus so can anyone attending harass them about a release date for the K mount version?

09-19-2013, 07:23 PM	#467
Mock Veteran Member Join Date: Feb 2009 Location: Edmonton Photos: Gallery \| Albums Posts: 314	Originally posted by Digitalis There will be a penalty - field curvature and coma. According to lenstip the DA 21 has worse coma than the 18-35 wide open, not that I have ever noticed a negative impact of this since I don't make photos of diodes. Similarly, I've yet to encounter a situation where field curvature would cause an issue on any lens, because I don't make photos of brick walls. Nothing is perfect. I've just uploaded a new photo (at full resolution for Flickr members), typical wide angle subject taken at 18mm and f/1.8 for testing purposes, and it appears I was far enough back that infinity is in decent focus too. At a regular viewing size you will see a bit of vignetting and distortion, which a lens profile would sort out with one click. Getting down to pixel peeper resolution it can be seen that the extreme left and right edges of the frame are soft - and if you look in the shadows you will see chroma noise because the Canon sensor/RAW file is awful for shadow recovery. All that aside, and backing out to normal viewing size again, perhaps one could appreciate how surprisingly good this looks for a photo taken with a lens wide open (zoom or prime) at f/1.8. Last edited by Mock; 09-19-2013 at 07:33 PM.

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09-19-2013, 05:46 PM	#466
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by normhead Do you guys honestly think you're going to walk around with a 2 pound lens around your neck? I never use the camera strap, I always carry the camera in my hand - even with heavy lenses. Originally posted by Mock I prefer to have as many options as I can, which is why I don't mind having 18mm at f/1.8, especially when there is no penalty in IQ. There will be a penalty - field curvature and coma.

09-25-2013, 07:30 PM	#468
SyncGuy Veteran Member Join Date: Oct 2011 Posts: 821	Originally posted by Mock According to lenstip the DA 21 has worse coma than the 18-35 wide open, not that I have ever noticed a negative impact of this since I don't make photos of diodes. Similarly, I've yet to encounter a situation where field curvature would cause an issue on any lens, because I don't make photos of brick walls. Nothing is perfect. I've just uploaded a new photo (at full resolution for Flickr members), typical wide angle subject taken at 18mm and f/1.8 for testing purposes, and it appears I was far enough back that infinity is in decent focus too. At a regular viewing size you will see a bit of vignetting and distortion, which a lens profile would sort out with one click. Getting down to pixel peeper resolution it can be seen that the extreme left and right edges of the frame are soft - and if you look in the shadows you will see chroma noise because the Canon sensor/RAW file is awful for shadow recovery. All that aside, and backing out to normal viewing size again, perhaps one could appreciate how surprisingly good this looks for a photo taken with a lens wide open (zoom or prime) at f/1.8. Agreed! It's pretty darn good enough! I mean, sure... Try doing that in low light, handheld with a 21/3.2 and see which one has a more useable shutter speed/iso.. At the end of the day, having a good and useable shot is 1000 times better than a non-useable mess of a blurry picture..

09-25-2013, 07:36 PM	#469
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	I intend to use this lens for indoor (mostly flashless) shooting--where it's strengths will be most useful and its weaknesses, less relevant.

09-26-2013, 06:04 PM	#470
Mock Veteran Member Join Date: Feb 2009 Location: Edmonton Photos: Gallery \| Albums Posts: 314	Originally posted by SyncGuy I mean, sure... Try doing that in low light, handheld with a 21/3.2 and see which one has a more useable shutter speed/iso.. At the end of the day, having a good and useable shot is 1000 times better than a non-useable mess of a blurry picture.. Precisely. As soon as we get in a Nikon-mount I can play with, the nights will be longer, and I will try to get out and do some urban night shooting with it. I recognize the slight absurdity in shooting a daytime landscape at f/1.8, but it was for science!

09-26-2013, 06:13 PM - 2 Likes	#471
Aristophanes Site Supporter Join Date: Jul 2008 Location: Rankin Inlet, Nunavut Photos: Albums Posts: 3,948	Originally posted by Mock Precisely. As soon as we get in a Nikon-mount I can play with, the nights will be longer, and I will try to get out and do some urban night shooting with it. I recognize the slight absurdity in shooting a daytime landscape at f/1.8, but it was for science! Uh.... ....around here photography is a religion.

09-27-2013, 01:11 AM	#472
Barry Pearson Veteran Member Join Date: Jul 2013 Location: Stockport Posts: 964	Originally posted by Aristophanes Uh.... ....around here photography is a religion. Photography is a mission! To risk life and limb to capture those pesky images and bring them back to base to be subjected to scrutiny.

09-27-2013, 02:17 AM	#473
Clavius Veteran Member Join Date: Feb 2011 Location: De Klundert Photos: Gallery Posts: 4,150	I thought photography was just collecting raw materials, of which you make something later on?

09-27-2013, 02:39 AM	#474
SyncGuy Veteran Member Join Date: Oct 2011 Posts: 821	Woah... Wait.......! Isn't photography all about turning into guinea pigs for the corporate companies via shooting brick walls and pixel peeping?!

10-12-2013, 08:48 AM	#475
Thomas.CS New Member Join Date: Oct 2013 Posts: 5	Really thinking about this lens, I have the DA15 for when I want the really wide into-the-sun shots so flare shouldn't bother me too much. But for indoors, birthday parties, star shots and indoor/evening events this seems like an amazing lens.

10-12-2013, 09:22 AM	#476
Edgar_in_Indy Veteran Member Join Date: May 2010 Location: Indiana, USA Photos: Gallery Posts: 2,685	And I would love to take this lens with me to the hospital when my next child is born in June, so I'm keeping my fingers crossed that the Pentax-mount is conceived prior to that.

10-12-2013, 09:51 AM	#477
Thomas.CS New Member Join Date: Oct 2013 Posts: 5	Originally posted by Edgar_in_Indy And I would love to take this lens with me to the hospital when my next child is born in June, so I'm keeping my fingers crossed that the Pentax-mount is conceived prior to that. My next is due in late march so I hope they are faster then that!

10-12-2013, 01:29 PM	#478
scole Senior Member Join Date: Jan 2009 Location: Everett, WA Posts: 216	Lately I've been thinking about picking up one of the Bower/Samyang/Rokinon fast wide primes for astrophotography but I completely forgot about this lens. It would certainly eliminate some of my indecision about selecting a focal length. Just wish they'd be more forthcoming about a release date for the Pentax version.

10-12-2013, 02:11 PM	#479
Mock Veteran Member Join Date: Feb 2009 Location: Edmonton Photos: Gallery \| Albums Posts: 314	Originally posted by scole Lately I've been thinking about picking up one of the Bower/Samyang/Rokinon fast wide primes for astrophotography but I completely forgot about this lens. It would certainly eliminate some of my indecision about selecting a focal length. Just wish they'd be more forthcoming about a release date for the Pentax version. Nikon should finally be shipping next week (15th), and Sony is listed as "Mid-November", Pentax is still TBA. I hope the Sony batch is a small one, so they can get underway with Pentax quickly. I've already resigned myself to the fact I won't have this for vacation at the end of this month.

10-24-2013, 06:45 AM	#480
scole Senior Member Join Date: Jan 2009 Location: Everett, WA Posts: 216	I know Sigma will be at PhotoPlus so can anyone attending harass them about a release date for the K mount version?