Sigma 18-35/f1.8 is on daily deal at BH

Sigma 18-35/f1.8 is on daily deal at BH · 09:06 AM

Sigma 18-35mm f/1.8 DC HSM Art Lens for Pentax K 210-109 B&H

Wonder if this is a great price or only a tad bit cheaper.

Docrwm · 12-04-2018, 10:07 AM

Its a great price for a fantastic lens. Best addition to my kit in years. Sharp, sharp, sharp with great contrast and light management. BIG and heavy too, but on a tripod that's not an issue. Carrying it around is another issue.

kraigg007 · 12-04-2018, 02:41 PM

Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode.

Adam · 12-04-2018, 02:53 PM

Originally posted by kraigg007

Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode.

You should upgrade the firmware in your lens and/or send it in to Sigma. These are per-copy quirks related to their reverse-engineering of the Pentax AF protocol, it seems.

Adam
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Docrwm · 12-04-2018, 03:07 PM

Originally posted by kraigg007

Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode.

I shoot with it nearly every day on my K5IIs and have had a total of 0 problems, issues, or mis-focuses with it. Absolutely perfect performance and well worth every penny.

kraigg007 · 12-04-2018, 03:15 PM

Originally posted by Docrwm

I shoot with it nearly every day on my K5IIs and have had a total of 0 problems, issues, or mis-focuses with it. Absolutely perfect performance and well worth every penny.

I have even sent it in with my k5-IIs and it came back with the same issue. I read the 18-35mm review on this sight and saw that this was a typical problem and gave up on it. It has been in my back unless i am doing a landscape shoot where I can use live view effectively. Otherwise it is useless. Super sharp in live view mode, out of focus through the viewfinder of everyday shooting.

I am glad you have a great copy. It has potential but my experience must be isolated. Or maybe not.

Docrwm · 12-04-2018, 03:29 PM

Originally posted by kraigg007

I have even sent it in with my k5-IIs and it came back with the same issue. I read the 18-35mm review on this sight and saw that this was a typical problem and gave up on it. It has been in my back unless i am doing a landscape shoot where I can use live view effectively. Otherwise it is useless. Super sharp in live view mode, out of focus through the viewfinder of everyday shooting.

I am glad you have a great copy. It has potential but my experience must be isolated. Or maybe not.

Sorry you've had such a problem with yours. Have you tried editing the settings using the USB base?

kraigg007 · 12-04-2018, 03:43 PM

Originally posted by Docrwm

Sorry you've had such a problem with yours. Have you tried editing the settings using the USB base?

I need to get one of those USB bases. i have multiple sigma lenses, but no base for updates.

Docrwm · 12-04-2018, 04:45 PM

Originally posted by kraigg007

I need to get one of those USB bases. i have multiple sigma lenses, but no base for updates.

Try KEH. I got one for $25ish when no one else was selling them for less than MSRP. With $50 total shipping is free.

**Digitalis** · 12-04-2018, 05:07 PM

Originally posted by Adam

You should upgrade the firmware in your lens and/or send it in to Sigma.

This is rather unhelpful as there is no new firmware for Pentax K mount versions of this lens.

Getting the USB lens dock lets you alter AF calibration for each focal length, however the degree of adjustment is pretty limited.

I used these adjustments after multiple calibration runs with a lens align test target.

Docrwm · 12-04-2018, 05:27 PM

Originally posted by Digitalis

This is rather unhelpful as there is no new firmware for Pentax K mount versions of this lens.

Getting the USB lens dock lets you alter AF calibration for each focal length, however the degree of adjustment is pretty limited.

I used these adjustments after multiple calibration runs with a lens align test target.

Seems FAR more versatile than 1 global adjustment available in camera.

**Digitalis** · 12-04-2018, 05:33 PM

I agree, however most of the focus issues users experience typically occur between 2m and infinity. As you can see from the screenshot, there is zero faculty for adjustment in that specific focus range.

The need for a reliable focus target just to iron out any inherent AF mis-calibration, this however does not eliminate the seemingly random AF misses.

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12-04-2018, 05:07 PM	#10
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by Adam You should upgrade the firmware in your lens and/or send it in to Sigma. This is rather unhelpful as there is no new firmware for Pentax K mount versions of this lens. Getting the USB lens dock lets you alter AF calibration for each focal length, however the degree of adjustment is pretty limited. I used these adjustments after multiple calibration runs with a lens align test target. Last edited by Digitalis; 12-04-2018 at 05:12 PM.

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12-04-2018, 10:07 AM	#2
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Its a great price for a fantastic lens. Best addition to my kit in years. Sharp, sharp, sharp with great contrast and light management. BIG and heavy too, but on a tripod that's not an issue. Carrying it around is another issue.

12-04-2018, 02:41 PM	#3
kraigg007 Senior Member Join Date: Oct 2013 Location: Florida Photos: Gallery Posts: 195	Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode.

12-04-2018, 02:53 PM	#4
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by kraigg007 Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode. You should upgrade the firmware in your lens and/or send it in to Sigma. These are per-copy quirks related to their reverse-engineering of the Pentax AF protocol, it seems. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

12-04-2018, 03:07 PM	#5
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by kraigg007 Has there been a fix for this lens? With my K-5IIs it only focuses in live view. Looking through the viewfinder, the autofocus isn't accurate. In live view mode, the image is spot on. FYI from about 27mm to 35mm, it works well in full frame mode. I shoot with it nearly every day on my K5IIs and have had a total of 0 problems, issues, or mis-focuses with it. Absolutely perfect performance and well worth every penny.

12-04-2018, 03:15 PM	#6
kraigg007 Senior Member Join Date: Oct 2013 Location: Florida Photos: Gallery Posts: 195	Originally posted by Docrwm I shoot with it nearly every day on my K5IIs and have had a total of 0 problems, issues, or mis-focuses with it. Absolutely perfect performance and well worth every penny. I have even sent it in with my k5-IIs and it came back with the same issue. I read the 18-35mm review on this sight and saw that this was a typical problem and gave up on it. It has been in my back unless i am doing a landscape shoot where I can use live view effectively. Otherwise it is useless. Super sharp in live view mode, out of focus through the viewfinder of everyday shooting. I am glad you have a great copy. It has potential but my experience must be isolated. Or maybe not.

12-04-2018, 03:29 PM	#7
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by kraigg007 I have even sent it in with my k5-IIs and it came back with the same issue. I read the 18-35mm review on this sight and saw that this was a typical problem and gave up on it. It has been in my back unless i am doing a landscape shoot where I can use live view effectively. Otherwise it is useless. Super sharp in live view mode, out of focus through the viewfinder of everyday shooting. I am glad you have a great copy. It has potential but my experience must be isolated. Or maybe not. Sorry you've had such a problem with yours. Have you tried editing the settings using the USB base?

12-04-2018, 03:43 PM	#8
kraigg007 Senior Member Join Date: Oct 2013 Location: Florida Photos: Gallery Posts: 195	Originally posted by Docrwm Sorry you've had such a problem with yours. Have you tried editing the settings using the USB base? I need to get one of those USB bases. i have multiple sigma lenses, but no base for updates.

12-04-2018, 04:45 PM	#9
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by kraigg007 I need to get one of those USB bases. i have multiple sigma lenses, but no base for updates. Try KEH. I got one for $25ish when no one else was selling them for less than MSRP. With $50 total shipping is free.

12-04-2018, 05:27 PM	#11
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by Digitalis This is rather unhelpful as there is no new firmware for Pentax K mount versions of this lens. Getting the USB lens dock lets you alter AF calibration for each focal length, however the degree of adjustment is pretty limited. I used these adjustments after multiple calibration runs with a lens align test target. Seems FAR more versatile than 1 global adjustment available in camera.

12-04-2018, 05:33 PM	#12
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	I agree, however most of the focus issues users experience typically occur between 2m and infinity. As you can see from the screenshot, there is zero faculty for adjustment in that specific focus range. The need for a reliable focus target just to iron out any inherent AF mis-calibration, this however does not eliminate the seemingly random AF misses.