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10-12-2017, 10:15 AM   #1
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Vivitar Automatic Extension tubes.

I need some help with Vivitar Automatic Extension tubes.
On the tube it is marked as a AT-21
The seller says it is for Pentax K mount.
But upon a close look I see two levers on opposite sides.
I think the Pentax should have only one lever.
I would appreciate any help.

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10-12-2017, 10:27 AM - 1 Like   #2
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Naaa. Definitely not PK - no slot for the mount locking pin. PK does have two levers, but they are differnt in shape and size - one is in a recessed slot - and are opposite each other. Olympus I think.

Last edited by marcusBMG; 10-12-2017 at 10:33 AM.
10-12-2017, 05:24 PM   #3
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Hard to find. Wish Pentax make more new.
11-07-2017, 05:48 PM   #4
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If they were Pentax would they work with an A lens and meter exposure?

11-12-2017, 08:03 AM   #5
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QuoteOriginally posted by Ascencio Quote
If they were Pentax would they work with an A lens and meter exposure?
nope. need an aperture contact. they'd work in m mode though. if you're using any of the crop bodies, you can take the glass out of a cheap teleconverter and have an extension tube with full contacts.
11-21-2017, 05:48 AM   #6
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AT-21 is Olympus mount, you want the AT-22 set. Here's some on ebay, but they are in Germany.

PENTAX / Vivitar Tube Set AT-22 | eBay

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