2X teleconverter for Vivitar 100mm 2.8 Macro lens

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gmachine
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2X teleconverter for Vivitar 100mm 2.8 Macro lens
1 month ago

I have a excellent copy of a Vivitar 100mm Macro 2.8 (not S1) its manual focus and like using it to shoot pictures of hummingbirds.  Thinking about adding a 2X teleconverter to give me more reach.  I usually use catch in foucus.  Does anyone have experience using a teleconverter on this lens or have any recommendations as what to look for?  Don't want to spend a lot of money for the new Pentax one.

 gmachine's gear list:gmachine's gear list
Pentax K-5 Pentax K-5 IIs Pentax smc FA 43mm F1.9 Limited Sigma 18-250mm F3.5-6.3 DC Macro OS HSM HD Pentax DA 70mm F2.4 AL Limited +1 more
Kodak Pixpro S-1
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