Macro Vivitar Automatic Extension tubes.

Greg18 · 10-12-2017, 10:15 AM

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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.

Attached Images

**marcusBMG** · 10-12-2017, 10:27 AM - **1 Like**

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.

http://rick_oleson.tripod.com/index-99.html

KDD · 10-12-2017, 05:24 PM

Hard to find. Wish Pentax make more new.

Ascencio · 11-07-2017, 05:48 PM

If they were Pentax would they work with an A lens and meter exposure?

sculptor666 · 11-12-2017, 08:03 AM

Originally posted by Ascencio

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.

bluestringer · 11-21-2017, 05:48 AM

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

10-12-2017, 10:15 AM	#1
Greg18 Junior Member Join Date: May 2016 Photos: Gallery Posts: 28	Vivitar Automatic Extension tubes. Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. 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. Attached Images

10-12-2017, 10:27 AM - 1 Like	#2
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,869	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. http://rick_oleson.tripod.com/index-99.html Last edited by marcusBMG; 10-12-2017 at 10:33 AM.

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10-12-2017, 05:24 PM	#3
KDD Veteran Member Join Date: Sep 2013 Photos: Gallery \| Albums Posts: 403	Hard to find. Wish Pentax make more new.

11-07-2017, 05:48 PM	#4
Ascencio Senior Member Join Date: May 2016 Photos: Gallery Posts: 105	If they were Pentax would they work with an A lens and meter exposure?

11-12-2017, 08:03 AM	#5
sculptor666 Pentaxian Join Date: Dec 2013 Location: PA Photos: Gallery Posts: 675	Originally posted by Ascencio 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
bluestringer Veteran Member Join Date: Nov 2011 Location: Cotton fields of South Georgia Photos: Gallery Posts: 2,748	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