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Key Features

Use one or multiple extension rings for further creative capabilities.
Use one or multiple extension tubes together, placed between the lens and camera body.
The tubes can also be used for manual exposure control.
The PK-13 is a 27.5mm Auto Extension Tube. Extension tubes enable a lens to focus closer than its normal set minimum focusing distance.
An AI NIKKOR will retain automatic diaphragm and meter coupling functions, letting you compose, focus and meter at a wide-open apertures.
PK-13 Auto Extension Tube AI (27.5mm) 5 5 1 1
Small tools that work I originally got this with my old 55/2.8 macro lens. Now with a D7000 my old AIS lenses can come out to play and this (and the other rings) give them great close-up utility. It's strong-all metal construction makes one confident to stack them together to get ever closer. I'd recommend a macro rail for precise focusing as you exceed 1:1 - the DR-6 with it's 2X magnification also helps. May 27, 2011
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PK-13 Auto Extension Tube AI (27.5mm)
 
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Do you know if the PK extension tube will work with my D90 and 18-200 Lens?

Dec 31, 2011 by
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Having read other posts, I understand I will lose metering and autofocus; that's ok. But will it work at all and will I be able to set aperature and shutter speeds? Thanks. Marty
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Answer: 
Auto extension rings (PK-series 11a, 12 or 13; PN-11) can be use with maximum aperture of f/5.6 or faster. AF, metering and scene modes are not available.
Jan 3, 2012 by
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