Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-19-2010, 02:02 AM   #1
Senior Member




Join Date: Oct 2009
Location: Kolkata
Photos: Gallery
Posts: 115
Old 2X Vivitar TC with new Pentax DA L lenses

I have a very old 2x Vivitar TC. If I am willing to sacrifice AF, can I use it with a DA L 55-300mm?

When I mount the combo, I get no AE reading at all. Can someone please advise.
Thanks
Arijit

01-19-2010, 11:30 AM   #2
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,864
Is this the Vivitar 2X-22? If the TC doesn't have electrical contacts, it "converts" your lens into a basic K-mount lens: no AF and no camera control of aperture. With a DA lens and no aperture ring, I think the aperture is stuck at its minimum value, f22 or worse. So it would be not very useful.
01-19-2010, 12:10 PM   #3
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
better (althoug not much perhaps) to get a Takumar - A teleconverter
01-19-2010, 10:42 PM   #4
Senior Member




Join Date: Oct 2009
Location: Kolkata
Photos: Gallery
Posts: 115
Original Poster
Vivitar TC

The TC says PKA.

It has electrical contacts but the Kx does not read either the 18-55mm or the 55-300mm lenses (DA L).

When I attach my Sigma 28mm I at least get AE with green button. When I mount the same lens with the TC Zilch! I get nothing.

Is there a way to bye pass this problem?

Looking for a 1.4X but not easy to come by in India.

Also I have been told I will lose 2 stops of exposure with a 2x converter. So when a combo is mounted the aperture ring at 5.6 means 2.8? Am I right or is it the other way around?

Thanks,

Arijit


Last edited by ariban; 01-19-2010 at 10:44 PM. Reason: incomplete
01-19-2010, 11:05 PM   #5
Veteran Member
wshi's Avatar

Join Date: Dec 2009
Location: Illinois
Posts: 455
A friend of mine let me have her old Vivitar 2x macro teleconverter, and I have experienced similar limitations. Due to the lack of aperture ring on the DA L kit lenses, there seems to be no way to alter the aperture except using M mode, which causes it to completely stop down, or Av mode, which causes it to go wide open. So far, I've only been able to use it in Av mode hand held, which although makes the image quite soft, seems to me mildly usable as the metering appears to work. In M mode however, the metering appears to be off by a few stops and I can only get results using a tripod and very long exposures.

Strange that yours can't recognize the DA L's at all, but does fine with the sigma?
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!
2x, da, k-mount, pentax da, pentax lens, slr lens, tc, vivitar
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: (3) Vivitar Series 1 70-210mm lenses + 3 Pentax lenses JP_Seattle Sold Items 13 04-23-2010 03:10 PM
For Sale - Sold: K-Mount Lenses (Pentax, Tokina, Vivitar) deadwolfbones Sold Items 7 04-16-2009 01:46 PM
For Sale - Sold: Pentax and Vivitar Lenses EsBee Sold Items 8 04-03-2009 07:44 AM
For Sale - Sold: Vivitar Series 1 and Pentax Lenses for sales Denis Sold Items 8 05-17-2007 09:05 PM



All times are GMT -7. The time now is 12:18 AM. | 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