Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
01-09-2013, 08:30 AM   #1
Junior Member

Join Date: May 2012
Posts: 28
Sigma 18-50mm F2.8-4.5 DC OS HSM

I just received a new Sigma 18-50mm F2.8-4.5 DC OS HSM that I bought on ebay. I am using it on my K30. When I tested the lens, I cannot get the f stop down lower than 4.5. It will go way above it. I even tried it in manual. Is this lens older and not compatible with my camera? I don't know if I need to try & return it. I was looking forward to using it, but really disappointed now.

01-09-2013, 08:32 AM   #2
Emperor and Senpai
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Posts: 5,419
Are you zoomed out to the long end? If so that's the problem. Try bringing it back to 18mm and then setting the aperture.
01-09-2013, 08:35 AM   #3
Junior Member

Join Date: May 2012
Posts: 28
Original Poster
Thank you Voice. I guess I just assumed if I changed it to manual, I could set it to anything and it would just say over or under exposed. So glad to have this forum for help when my brain malfunctions.

  • 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!
18-50mm, 18-50mm f2.8-4.5 dc, dc, f2.8-4.5, f2.8-4.5 dc os, hsm, k-mount, lens, os, pentax lens, sigma, sigma 18-50mm f2.8-4.5, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
SMC Pentax-DA 18-135mm F3.5-5.6 VS Sigma AF 17-50mm f/2.8 EX DC HSM OS amorgwrites Pentax K-5 11 10-05-2012 10:05 PM
For Sale - Sold: Brand New Sigma 18-50mm OS HSM f2.8-4.5 - 6 Available mackloon Sold Items 19 08-13-2011 07:30 PM
For Sale - Sold: Sigma 18-50mm F2.8-4.5 OS HSM (Worldwide) PNTXFTW12 Sold Items 4 12-10-2010 10:23 AM
For Sale - Sold: Sigma 18-50mm f2.8-4.5 OS HSM (US) opiedog Sold Items 9 09-22-2010 09:55 AM

All times are GMT -7. The time now is 08:35 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]