Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-25-2009, 09:06 PM   #1
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,655
Switch problem on Sigma 70-300mm APO

I bought this lens recently and was told the switch was for using 300mm as a psuedo macro lens. I moved this switch yesterday from Full to Normal and back to Full, but today when I tried to move it to back to Normal, the switch wouldn't budge. Is there a trick to moving it?

Sorry mods, wrong forum, could one of you move it to the lens forum?

06-25-2009, 09:50 PM   #2
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,901
I always had problems with the switch on mine. I never used it enough to remember the best method of getting it off macro. Usually involved pushing back and forth, twisting left and right, and swearing.

That lens finally died of aperture blade-failure - only noticed when being examined by potential buyer :-(
06-25-2009, 10:12 PM   #3
Ari
Site Supporter
Ari's Avatar

Join Date: Feb 2007
Location: Freehold, NJ
Photos: Gallery | Albums
Posts: 794
Had the same problem (on a non - APO). I would have to unmount the lens, bring it to the lowest focal length in the macro range, then it would switch easily.
06-25-2009, 10:26 PM   #4
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,655
Original Poster
Well, I found the answer. I simple contacted the gentleman that sold me the lens and he pointed me to the solution.

What one needs to do is, make sure the lens is set to at least infinity. Then the switch will move.

Here's the link he gave me to find my answer:

[Lens] Sigma 70 - 300 APO Macro. Sticking switch - dslreports.com

06-25-2009, 10:40 PM   #5
pbo
Veteran Member
pbo's Avatar

Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 891
Just a quick adding - switch won't budge because your lens is focused at its macro distance range - you can sort of see on the barrel, markings 1:10.... 1:2. Whenever you see those markings, it means your lens is focused closer than it *can* focus normally. So, it's totally normal that you cannot bulge the switch - it's just not supposed to bulge because your lens is not focussed in "normal" range, but closer. After all, focus limiter is added there for a reason. Also, you don't have to focus to infinity to move the switch - you just have to make sure the lens is focused within its "normal", not macro, range. So just focus on, say, something that's more than 2 meters away, or just switch to manual focus and turn the ring yourself.
06-26-2009, 12:11 AM   #6
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,655
Original Poster
Well, I am not sure how I managed to move it then. I focused on Infinity, moved the zoom to 300mm and it let me move the switch. Btw, my cameras are always set on M/MF.

And maybe I didn't have to do it this way, but since you came in after I saw the answer on that other site, that's what I did.
06-26-2009, 01:58 AM   #7
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,075
Mine did that, I undid the two little screws and sorted the little sliding bit that had come adrift

Pete
06-26-2009, 02:04 AM   #8
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,655
Original Poster
QuoteOriginally posted by Transit Quote
Mine did that, I undid the two little screws and sorted the little sliding bit that had come adrift

Pete
I thought about removing the little screws, but I was afraid of what would happen if I did.

06-26-2009, 02:09 AM   #9
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,075
QuoteOriginally posted by photolady Quote
I thought about removing the little screws, but I was afraid of what would happen if I did.
Don't worry , there is just a little sliding contact thing, nothing springs out
Pete
06-26-2009, 02:52 AM   #10
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,655
Original Poster
Yep, that's exactly why I didn't remove them. Afraid I'd have some very small spring jump out and I'd lose it.
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!
forum, k-mount, lens, move, pentax lens, sigma 70-300mm, slr lens, switch
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 70-300mm APO or Tamron 70-300mm? Colorado CJ Pentax SLR Lens Discussion 6 10-12-2010 02:49 PM
Pentax 55-300mm versus Sigma 70-300mm DG APO Macro mazdamazda Pentax SLR Lens Discussion 49 07-27-2010 12:46 AM
For Sale - Sold: FS: FA 77mm limited, Sigma 17-70mm DC Macro, Sigma 70-300mm APO DG chemxaj Sold Items 10 03-17-2008 08:55 AM
Sigma 70-300mm DG APO vs non-APO (or, did I make a bad choice?) aerodave Pentax SLR Lens Discussion 28 09-01-2007 01:51 PM



All times are GMT -7. The time now is 09:32 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