Teleconverter for SMC Pentax DA 1:4-5.8 55:300mm ED ?

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Michael Piziak
Michael Piziak Contributing Member • Posts: 556
Teleconverter for SMC Pentax DA 1:4-5.8 55:300mm ED ?

On the auction site, what, perhaps preferably Pentax branded, teleconverter should I look for and how much will it increase the 300mm to?

I imagine, the less magnification, the sharper the image will remain?

 Michael Piziak's gear list:Michael Piziak's gear list
Pentax K-r Pentax smc DA 18-55mm F3.5-5.6 AL Pentax smc DA 55-300mm F4.0-5.8 ED +1 more
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