Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-22-2012, 08:30 PM   #1
New Member




Join Date: Sep 2011
Posts: 2
Sue from Seattle area

First I would like to thank Pentax Forums for this supportive website- It means so much to me when I am the only Pentax user in my camera club-
At this time I am researching teleconverters vs purchasing the 50-500 mm zoom by Sigma.
Just trying to find out how to ask about the Pentax F 1.7 Teleconverter- If anyone out there has used this - I own a Pentax K5 and was thinking about using a teleconverter with my Tamron 28-300mm lens as a less expensive alternative to an expensive 50-500mm which doesn't seem to have a good review-

Also are there any extension tubes made for Pentax cameras? Thanks for your help here

05-22-2012, 08:40 PM   #2
Site Supporter
eaglem's Avatar

Join Date: Feb 2009
Location: Perth Western Australia
Photos: Gallery
Posts: 27,640
Welcome to the forum, in answer to your question, yes Kenko make extension tubes for Pentax and they have the contact points for the camera & lens. Remember, when using extension tubes you will lose a certain amount of light which you'll need to compensate for.
05-22-2012, 09:49 PM   #3
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
Welcome to the funny farm! Don't mind the outpatients. For tips on extension for Pentax lenses, see: https://www.pentaxforums.com/forums/pentax-lens-articles/152336-cheap-macro-b...lose-work.html

Both extension (tubes, bellows, helicoids, etc) and rear-mounted teleconverters, eat light. And the less expensive sorts reduce lens functionality. Auto-aperture control depends on A-type contacts on both the lens, and extension or TC. The cheap trick for extension is to get used A-type TCs and remove the glass. Compared to A-type macro tubes, deglassed TCs are both less expensive and less flexible. Ain't no free lunch here.

For more reach, I prefer quality front-mounted adapters to rear-mounted TCs. These don't cut light, nor interfere with lens aperture|focus functions. I often use a Sony VCL-1546A screw-on 1.5x tele adapter on lenses with front threads up to 52mm. I see less loss of image quality than with midrange rear-mount TCs. And quality tele adapters from Sony, Canon, Olympus, Kowa etc are pretty cheap.

The best TCs are optically better than such tele adapters. But they cost much much more. I'd have to rob a minimart to buy a good one, but I'm too lazy for that, so I'll get by with the Sony.

Glad to have you with us. Have fun!

EDIT: For A-type tubes, here is your opportunity: https://www.pentaxforums.com/forums/photographic-equipment-sale/187006-sale-k...-tube-set.html

Last edited by RioRico; 05-22-2012 at 10:31 PM.
05-23-2012, 10:24 AM   #4
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,418
On you len choices: neither. If you want high image quality, stay away from zooms with ultra-wide range. If you want 500mm cheap, get a mirror lens.

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!
pentax, teleconverter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
So I walked into the Seattle area Fry's Electronics... Cannikin Pentax DSLR Discussion 37 06-25-2012 04:27 PM
Seattle Area Photography v5planet Photographic Technique 8 04-27-2011 09:19 AM
Seattle-area Pentaxians? RoxnDox Travel, Events, and Groups 13 07-31-2010 09:21 PM
Seattle area indoor shoots?? OrenMc Photographic Technique 5 10-29-2009 02:50 AM
Hello from the Seattle area.. scole Welcomes and Introductions 6 01-03-2009 10:46 AM



All times are GMT -7. The time now is 04:52 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