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05-29-2010, 12:19 PM   #1
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question regarding a vivitar

hi, all,

maybe a dumb question, but can someone please explain what this lens is? can how can i use it? thanks a lot!

Amazon.com: Pentax SMCP-DA* 200mm f/2.8 ED (IF) 2x Teleconverter (4 Elements) + Nwv Direct Microfiber Cleaning Cloth.: Everything Else



picture is the Official one from Amazon.

05-29-2010, 12:40 PM   #2
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That's a teleconverter that maintains the SDM autofocus for your Pentax lenses. It doubles their reach but cuts the amount of light to F5.6.
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