question regarding a vivitar

shang · 05-29-2010, 12:19 PM

picture is the Official one from Amazon.

Adam · 05-29-2010, 12:40 PM

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.

05-29-2010, 12:19 PM	#1
shang Senior Member Join Date: May 2010 Location: long island Posts: 135	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.

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05-29-2010, 12:40 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	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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