Tele-converter question

[Paul]

Recent LBA forced me to buy a Pentax rear converter - the 1.4 version. 
The Pentax compatibility chart is pretty specific about not using it 
with some Pentax lenses.  Does anyone have any experience using it with 
any third-party lenses - Tamron, Vivitar, etc?  Or is this a use with 
Pentax only lens?

-p
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