Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-17-2010, 04:50 PM   #1
Inactive Account

Join Date: Jul 2008
Location: Vancouver, Canada
Posts: 1,101
Pentax-A 200mm f/4 and a T6-2X teleconverter

I'm on LBA on the cheap for now. I picked up a excellent condition Pentax-A 200mm f/4 with a T6-2X TC today. I don't have any thing decent photo-wise to post as it was mainly find the setting which kills the PF.

Without the TC on, f/5.6 and above on my copy handles PF well enough that I think its acceptable. I had an M 200mm f/4 about 2 years ago that was unacceptable even up to f/8, it must have been a really bad copy. This A series lens is very sharp.

With the TC on the PF at f/6.7 is about the same result as without at f/5.6. The 2 issues are; 1. it passes infinity focus and 2. the focus indicator doesn't help as much.
Focusing, therefore, is not that easy. Also, with the TC on it stops the lens from metering but, that again is not a big issue with me. With the TC on its not as sharp as without but that is a given.

I think I'm going to like the A 200mm f/4 by itself. For handhold ability and the A position it's more realistic for me to get more keepers.

03-18-2010, 07:53 AM   #2
reeftool's Avatar

Join Date: Dec 2007
Location: Upstate New York
Photos: Gallery | Albums
Posts: 8,474
With my older glass, I've found that PF is more of an issue with the particular light and contrast of the shot, not so much the f stop. I agree that using a TC can make things worse. It seems to be at it's worse on somewhat light overcast days when it's still bright but a white sky. It's definately not the lens to choose for birds or squirrells in the tree tops.

  • 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!
200mm, copy, f/4, f/5.6, focus, k-mount, lens, pentax lens, pentax-a, pf, slr lens, tc
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
1.4x Teleconverter for Pentax K7 and smc PENTAX DA Star 200mm F2.8 ED (IF) SDM imagesforyou Ask B&H Photo! 20 09-19-2010 10:12 AM
Teleconverter for DA 50-200mm Banitess Pentax SLR Lens Discussion 5 06-06-2010 06:08 PM
DA* 300/200mm and Pentax A 1.4x-L teleconverter? Adam Pentax SLR Lens Discussion 4 05-17-2010 07:53 PM
K20/FA* 200mm with Teleconverter tpeace Pentax DSLR Discussion 1 10-05-2009 08:00 PM
Sigma 70-200mm & 2X teleconverter Mike.P Pentax SLR Lens Discussion 12 03-05-2009 02:19 PM

All times are GMT -7. The time now is 10:17 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]