Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-10-2022, 06:36 PM   #31
Site Supporter
Site Supporter
zkarj's Avatar

Join Date: Jan 2009
Location: Wellington
Posts: 1,180
QuoteOriginally posted by clackers Quote
The DA55-300 is a slow aperture lens, and the TC makes it even slower.
QuoteOriginally posted by clackers Quote
TCs are designed for fast lenses ... f2.8, f4 ...
What no-one seems to be mentioning in this thread is the OP's 55-300 PLM will not autofocus on the TC, as its maximum aperture is narrower than 4.

The only way to extend beyond 300mm with the TC and keep autofocus is to use the DA*300.

06-10-2022, 06:46 PM   #32
Loyal Site Supporter
Loyal Site Supporter




Join Date: Sep 2019
Location: Arkansas
Posts: 7,991
QuoteOriginally posted by zkarj Quote
What no-one seems to be mentioning in this thread is the OP's 55-300 PLM will not autofocus on the TC, as its maximum aperture is narrower than 4.

The only way to extend beyond 300mm with the TC and keep autofocus is to use the DA*300.
I use the Pentax 1.4 HD teleconverter with my 55-300 PLM and KP without problems in good light.
06-10-2022, 08:47 PM   #33
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 23,902
QuoteOriginally posted by zkarj Quote
What no-one seems to be mentioning in this thread is the OP's 55-300 PLM will not autofocus on the TC, as its maximum aperture is narrower than 4.

The only way to extend beyond 300mm with the TC and keep autofocus is to use the DA*300.
People do it all the time. The limits aren’t “hard and fast” the limits are “a guideline” to expectations. It may be less snappy but it’s likely to work if you have the light.
06-11-2022, 05:23 PM   #34
Loyal Site Supporter
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 15,909
QuoteOriginally posted by zkarj Quote
What no-one seems to be mentioning in this thread is the OP's 55-300 PLM will not autofocus on the TC
That's not true, it does, I've used it, so have plenty of other people, doesn't seem like you have, Zkarj.

But it's operating outside of the spec, so there are no promises about its performance.

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!
1.4x, 1.4x pz-af vs, k-mount, pentax, pentax lens, pz-af vs pentax, slr lens, tamron, tamron 1.4x pz-af, vs, vs pentax 1.4x
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K-5 vs MZ-S vs LX vs PZ-1p vs ist*D vs K10D vs K20D vs K-7 vs....... Steelski Pentax K-5 & K-5 II 2 06-28-2017 04:59 PM
Kenko Pz-AF SHQ TC 1.5X vs Tamron-F 1.4X Pz-AF MC4 SKwan Pentax DSLR Discussion 14 01-26-2013 05:17 AM
Wanted - Acquired: Tamron 1.4X TC or Kenko Pz-AF 1.5X SHQ TC kesong Sold Items 2 08-22-2012 07:31 PM
For Sale - Sold: Tamron-F AF TC (1.4x Pz-AF MC4) Teleconverter - highest rated TC on this forum Quazimoto Sold Items 3 06-17-2012 04:15 AM
For Sale - Sold: Tamron-F AF Tele-Converters (1.4x Pz-AF MC4, 2X Pz-AF BBAR MC7) dgaies Sold Items 2 11-02-2010 08:22 AM



All times are GMT -7. The time now is 06:01 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