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Thread: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

  1. #1
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    Default Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Hi,

    I've very new to Pentax. Just got a Pentax K-r this morning.

    I'm current thinking of getting a F* Pentax 300mm f4.5, but am concerned whether there is any 1.4X teleconverters that works with it and allow for AF? I have thoughts about the Pentax 1.7X, but not inclined because of the f-stop loss.

    Appreciate your advise.
    Olympus E-520/ZD 14-42/ Pentax K-r/Sigma 17-70/DA 60-250/FA 300 f4.5/Kenko 1.5X/AFA 1.7X

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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Tamron 1.4X Pz-AF MC4 Teleconverter or Kenko 1.5X Pz-AF Teleplus SHQ Teleconverter. Both discontinued but the Kenko one still can be bought as old new stock at another forum.

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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Thanks for the reply! appreciate it.

    What about this teleconverter below?

    http://www.vivitar.com/products/28/a...ters/861/14x-p
    Olympus E-520/ZD 14-42/ Pentax K-r/Sigma 17-70/DA 60-250/FA 300 f4.5/Kenko 1.5X/AFA 1.7X

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    Senior Member darrrrrrrrrr's Avatar
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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Probably not a good idea to pair a Vivitar teleconverter with a F* lens due to the image degradation. Why don't you buy the lens first and see if you even need the teleconverter? If 300mm is long enough, and cropping does the trick you might not even have to spend the extra $

  5. #5

    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Quote Originally Posted by darrrrrrrrrr View Post
    Probably not a good idea to pair a Vivitar teleconverter with a F* lens due to the image degradation. Why don't you buy the lens first and see if you even need the teleconverter? If 300mm is long enough, and cropping does the trick you might not even have to spend the extra $
    i thought the vivitar 1.5x SHQ is not bad?

    kengoh was using it for birding on an DA*300 before he got his new lens. its also the only one that is known to work on SDM lenses.

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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Quote Originally Posted by calvinlo View Post
    Thanks for the reply! appreciate it.

    What about this teleconverter below?

    http://www.vivitar.com/products/28/a...ters/861/14x-p
    That one is manual focus as don't have any electrical contact pins.

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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Quote Originally Posted by detritus View Post
    i thought the vivitar 1.5x SHQ is not bad?

    kengoh was using it for birding on an DA*300 before he got his new lens. its also the only one that is known to work on SDM lenses.
    Ken was using the Kenko 1.5X Pz-AF Teleplus SHQ teleconverter if i'm not wrong.

  8. #8

    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Quote Originally Posted by istDeS View Post
    Ken was using the Kenko 1.5X Pz-AF Teleplus SHQ teleconverter if i'm not wrong.
    thats what i thought too... we bought from the same supplier.

  9. #9

    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Quote Originally Posted by istDeS View Post
    Ken was using the Kenko 1.5X Pz-AF Teleplus SHQ teleconverter if i'm not wrong.
    You are right. Ken is using Kenko 1.5X Pz-AF Teleplus SHQ teleconverter. I got the same one as him. Now mine is sitting in my dry cabinet for months after i change to Canon for my birding interest...

    Kenko 1.5X works fine for AF with my Pentax DA 55-300MM F4-5.8 ED and also ok for Ken's Pentax DA* 300mm f/4.

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    Default Re: Any 1.4X Teleconverters for F* Pentax 300mm f4.5 lens?

    Thanks for all the advice. I appreciate it.
    Olympus E-520/ZD 14-42/ Pentax K-r/Sigma 17-70/DA 60-250/FA 300 f4.5/Kenko 1.5X/AFA 1.7X

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