Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-13-2015, 08:42 AM   #1
Forum Member




Join Date: Apr 2015
Location: The Tarheel State, North Carolina
Posts: 91
Question on Sigma USB Dock for new Sigma Contemporary Lenses

Perhaps this has been dealt with before, but I just bought a Sigma Contemporary Zoom lens and should have it in a couple of days. Question: Will I need to purchase the Sigma USB Dock to make any minor AF adjustments to this lens if required, or can I use my K3 to make adjustments and if so, how??? I've been using Sigma lenses over the years and must be a fortunate fellow because none of my lenses have required an AF adjustment. Thanks for any comments on this. Don

12-13-2015, 09:27 AM   #2
osv
Pentaxian




Join Date: Mar 2007
Location: So Cal
Photos: Gallery
Posts: 2,080
my understanding is that you can typically trim the af with a camera, but it would apply to all focal lengths.

the dock lets you make four(?) af trim adjustments, at any combination of focal lengths you choose.

stevebrot has used one, maybe he'll weigh in with some comments.
12-13-2015, 10:38 AM   #3
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,219
You can read more about the dock here:
Sigma USB Dock Tutorial and Review - Introduction | PentaxForums.com Reviews

Like osv said, the dock allows you to make more targeted adjustments. Whether or not it's necessary will depend on your copy of the lens, but if you plan on getting more Sigma lenses in the future, it certainly wouldn't hurt to have the dock just in case.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

12-13-2015, 08:01 PM   #4
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 9,024
I got one to go with my 50mm Art and 17-70mm Contemporary lenses, but haven't had to use it. It's still in its box.

12-14-2015, 04:46 AM   #5
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,796
I have one of these expensive K mount lens caps.

As mentioned in the posts above, the Sigma lens dock allows for AF adjustments based upon focal length - but you can only adjust AF at fixed points along the distance scale relevant to the lens.



Also another thing to be wary of, the light (on the lens dock) only comes on when the sigma software detects the dock, after you close the software the green light will remain on - it will only blink when data is being written to the lens memory, it is best to attach the lens before plugging in the lens dock. It is also best to only unplug the lens dock after you close down the software - there is no disconnect option in the sigma software or through windows.


Last edited by Digitalis; 12-14-2015 at 07:52 PM.
12-14-2015, 03:54 PM   #6
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,474
QuoteOriginally posted by osv Quote
the dock lets you make four(?) af trim adjustments, at any combination of focal lengths you choose.

stevebrot has used one, maybe he'll weigh in with some comments.
Nah...stevebrot only watched the demo video. I would love to have the dock since my 17-70 (C) needs the firmware upgrade, but no money at present...it can wait. I am happy to see that Digitalis weighed in. He has hands-on experience and is very tech oriented.


Steve
12-14-2015, 03:55 PM   #7
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,474
QuoteOriginally posted by Digitalis Quote
As mentioned in the posts above, the Sigma lens dock allows for AF adjustments based upon focal length - but you can only adjust AF at fixed points along the distance scale relevant to the lens.
16 adjustments total


Steve
12-14-2015, 08:01 PM   #8
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,796
QuoteOriginally posted by stevebrot Quote
16 adjustments total
Don't get too excited, I hate to think of how many adjustments owners of the Sigma 18-300mm DC macro* OS HSM lenses get, which is probably somewhere between too many and not enough.

* this isn't the first time I have seen such optimism from sigma.

12-14-2015, 08:06 PM   #9
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 9,024
QuoteOriginally posted by Digitalis Quote
Don't get too excited, I hate to think of how many adjustments owners of the Sigma 18-300mm DC macro* OS HSM lenses get.

Let superzoom owners suffer.


Did I say that out loud? {Embarrassed cough}
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!
adjustments, af, camera, dock, lens, lenses, pentax help, photography, question, question on sigma, sigma, sigma usb dock, troubleshooting, usb
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Sigma USB Dock for Pentax goodasgold Sold Items 8 12-26-2015 08:29 AM
Sigma USB dock and the K3 and Sigma 18-35 TaiChiTom Pentax DSLR Discussion 2 03-15-2015 12:45 PM
Sigma usb dock to suit sigma 'a', 's' & 'c' pentax mount lenses i_trax Pentax Price Watch 4 09-16-2014 03:50 PM
Sigma USB dock for Pentax JPT Pentax News and Rumors 7 04-13-2014 12:25 AM



All times are GMT -7. The time now is 08:53 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