Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-20-2011, 02:24 AM   #16
Junior Member
Shantz's Avatar

Join Date: Jul 2009
Location: Bucharest
Photos: Gallery
Posts: 43
I got the Samsung version of this lens recently and I was wondering why I was getting 8 point star shaped lights in the background when shooting wide open. Since I use it most at its wide end, I guess f4 wasn't really wide open as I had thought so the 8 blades were closed a little.
This would also explain why this lens is reported to be sharpest at 12mm but what's the reason to do this? Why not let it be f3.5-4.0 or whatever? I don't think the PF would be much worse or a lot softer. So... vignetting? What else could it be?

05-24-2011, 10:18 PM   #17
Veteran Member
Chex's Avatar

Join Date: Feb 2011
Location: The 'Stoke, British Columbia
Photos: Gallery
Posts: 1,700
Yup, seems normal to me. My borrowed lens does the same! What a great lens, sad to have to return it

  • 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!
aperture, blades, k-mount, lens, pentax lens, slr lens, store
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
My K5 has problem or....really a big bug! Marco_Pochi Pentax K-5 17 10-31-2010 04:58 PM
K-7 Big Problem? robr7 Troubleshooting and Beginner Help 12 10-04-2010 08:13 AM
One big money problem. Bucik Troubleshooting and Beginner Help 22 08-05-2010 08:50 PM
i have a big problem with my cp510 printer hll Photographic Technique 6 12-22-2007 06:55 AM
Big Problem with my Video Card..I think...Big Ca Ca benjikan General Talk 19 03-18-2007 11:45 PM

All times are GMT -7. The time now is 08:57 PM. | 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]