Can someone explain how to choose the correct extension tube? I am using a Nikon N80 with a Sigma 28-300mm abd whould like to try some close-up work. I notice the tubes come in varying sizes. Also heard that Vivitar makes a 2X MACRO teleconverter that appears to be another extension tube type option. Thanks for all advice.
#1. "RE: Extension tube question." | In response to Reply # 0jrp Charter MemberMon 13-Aug-01 01:25 PM
Take a look at the Kenko Pro 300 series of teleconverters which allow to retain AF and metering. This is not possible with extension tubes.
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#2. "RE: Extension tube question." | In response to Reply # 0jjussi Basic MemberMon 13-Aug-01 02:33 PM
Why? Because it's only extension tube what transfers ALL nikon electro-contacts from lens to body + AF.
Nikons own tubes don't have electronical contacts.
And what comes to "choosing" right size of tube.. It's extension_tube_length/focal_length.. So if you want 1:1 (1" is 1" on film) and you have 28mm lens you need 28mm or more tubes. You can put tube over tube so if you put 36+20=56mm and use 28mm you get 2:1 so 1/2" is now 1" on film..