I want to buy Extension rings for macro photography. I have an Nikon 105mm macro lens and i have heard about 3rdparty extension rings that are cheaper than the Nikon ones. Do you have something in mind? I also know that i must get ones that will not disable AutoFocus etc. what must i be looking for because i have seen on ebay some really cheap ones!
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Also, i find some other Extension Rings in ebay cheap that are marked as K or PK, are they ones without "contacts"? What name would the right one so that they would work on my D7000?