Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-09-2021, 11:48 AM   #1
Senior Member




Join Date: Feb 2013
Photos: Gallery
Posts: 193
K1 and Sigma 150-500mm OS

Don't know if this has been posted before, apologies if it has. Recently bought a K1 (shop soiled) and using the sigma 150-500mm OS on the K1. The OS works ok but I tend to use back button focus. The OS works by pressing the AF buttion, but On a K3ii or K5, using the same set up, the OS activates with a half press of the shutter button, but not on the K1. Anyone know hoe to get round this or is it the way it is? Thanks in advance. Regards.

05-09-2021, 02:23 PM   #2
Site Supporter
Site Supporter
sergysergy's Avatar

Join Date: Jan 2011
Photos: Gallery
Posts: 4,933
There is an option in the custom settings.
Button Customization > AF/AE-L > Enable/Disable AF-2
05-09-2021, 03:10 PM   #3
Site Supporter
Site Supporter




Join Date: Jan 2016
Posts: 405
Well, I've got this parameter set to 'Enable AF1', and AF activates when I either press AF button, or half-press the shutter. All this with K-1 Mark I and Sigma 150-500 OS HSM.

Last edited by pentageek; 05-09-2021 at 03:11 PM. Reason: typo
05-11-2021, 01:25 PM   #4
Senior Member




Join Date: Feb 2013
Photos: Gallery
Posts: 193
Original Poster
QuoteOriginally posted by pentageek Quote
Well, I've got this parameter set to 'Enable AF1', and AF activates when I either press AF button, or half-press the shutter. All this with K-1 Mark I and Sigma 150-500 OS HSM.
Thanks but the point of enabling the back button AF is to disable the shutter button AF. This is ok but on the K3ii and 5 in this mode, a half press on the shutter switches on the OS on the lens without the focussing being enabled on said shutter button. The K1 does not behave the same way. Hope this makes sense. Regards, Geoff.

05-11-2021, 03:13 PM   #5
Site Supporter
Site Supporter




Join Date: Jan 2016
Posts: 405
QuoteOriginally posted by geoffw Quote
Thanks but the point of enabling the back button AF is to disable the shutter button AF
... and this is 'AF2' mode - in 'AF1' both buttons trigger AF, at least in my K-1 - I've just tested it again prior before I wrote this message OS is being activated automatically together with AF (if Sigma's switch 'OS' is in position 1 or 2).
Attached Images
 
05-14-2021, 01:22 PM   #6
Senior Member




Join Date: Feb 2013
Photos: Gallery
Posts: 193
Original Poster
QuoteOriginally posted by pentageek Quote
... and this is 'AF2' mode - in 'AF1' both buttons trigger AF, at least in my K-1 - I've just tested it again prior before I wrote this message OS is being activated automatically together with AF (if Sigma's switch 'OS' is in position 1 or 2).
Yes. AF2 selected on the K1 as it is on the K3ii, but with the K1, the lens OS is only activated by the AF button. On the K3ii, the lens OS is activated by the shutter button, not the AF button, so you can recompose without altering the focus, which is the whole idea of the back AF button.
05-14-2021, 02:23 PM   #7
Senior Member




Join Date: Jul 2009
Posts: 184
[mention]geoffw [/mention] , aside from this one limitation, how do you like the lens with the K1?
I was itching to get on, or the 50-500mm.
Already have the DA*300mm, 1.4TC, and the DA60-250, so may be redundant, I suppose.




05-15-2021, 12:58 AM   #8
Senior Member




Join Date: Feb 2013
Photos: Gallery
Posts: 193
Original Poster
QuoteOriginally posted by photoaki Quote
[mention]geoffw [/mention] , aside from this one limitation, how do you like the lens with the K1?
I was itching to get on, or the 50-500mm.
Already have the DA*300mm, 1.4TC, and the DA60-250, so may be redundant, I suppose.
I've only had the camera for a week and not really had the chance to spend a lot of time with it, but like an over excited kid I had to try some of the lenses. The 150-500mm seems better on the K1 than the K3ii/5 so far in dull light. From what I've read the 300mm is better but without the versatility of the zoom. But for birds etc its usually all about longer focal length. Really kicking myself for not getting the K1 when it came out. Was building a lens base at the time and have to save to get things.
05-15-2021, 01:33 PM   #9
Site Supporter
Site Supporter




Join Date: Jan 2016
Posts: 405
QuoteOriginally posted by geoffw Quote
but with the K1, the lens OS is only activated by the AF button.
Maybe with Mark II, or with old firmware. I believe we can make AF buttons work in your camera, if you are interested, please drop me PM.
05-15-2021, 09:18 PM   #10
Senior Member




Join Date: Jul 2009
Posts: 184
QuoteOriginally posted by geoffw Quote
The 150-500mm seems better on the K1 than the K3ii/5 so far in dull light. From what I've read the 300mm is better but without the versatility of the zoom.
Well, thatís encouraging.
I would expect the DA* 300mm to be sharper, and it is quite a bit faster at 4.0.
Might still get the Sigma if one comes up at a good price.
Thanks for the reply!


05-16-2021, 06:15 AM   #11
Loyal Site Supporter
Loyal Site Supporter
rogerstg's Avatar

Join Date: Oct 2007
Location: Rhode Island
Photos: Albums
Posts: 1,131
QuoteOriginally posted by geoffw Quote
The OS works by pressing the AF buttion, but On a K3ii or K5, using the same set up, the OS activates with a half press of the shutter button, but not on the K1
FWIW, it works the same on the KP as on the K1.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
button, camera, k1, k1 and sigma, os, pentax help, photography, sigma, sigma 150-500mm, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need lens hood for Sigma 170-500mm...same as 50-500mm and 150-500mm? Help please! Edgar_in_Indy Pentax SLR Lens Discussion 14 01-11-2022 08:50 AM
Sigma APO 150-500mm DG OS HSM focusing issue? cdw2000 Troubleshooting and Beginner Help 13 10-26-2020 03:31 PM
For Sale - Sold: SIGMA 150-500mm f/5.6.-6.3 APO DG OS AF Lens mikek200d Sold Items 5 03-18-2020 09:55 AM
For Sale - Sold: Sigma 150-500mm F5-6.3 APO DG OS HSM boriscleto Sold Items 2 05-19-2019 03:50 PM
For Sale - Sold: Sigma 150-500mm F5-6.3 APO DG OS HSM for PENTAX 150-500 transam879 Sold Items 3 03-24-2014 05:02 AM



All times are GMT -7. The time now is 02:20 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top