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**dionhouston** · 05-25-2023, 01:04 PM

Originally posted by Bob 256

Printable but with electrical connections??????

There actually is conductive 3D filament, so... Actually, I was just referring to the baffles -- I should be able to print something that will cover up the tubes.

**dionhouston** · 05-25-2023, 01:09 PM

Originally posted by Not a Number

Is the bayonet side of these tubes bare metal or black coated/anodized? If coated you need to remove some of the coating for the pins to work as there is no ground/earth otherwise:

See the earlier thread beginning here:
PK/A extension tubes? - Page 5 - PentaxForums.com

and here to see where about to remove the coating:
PK/A extension tubes? - Page 6 - PentaxForums.com

I'll have to check with a multimeter, but I think they're good... here's a pic...

Not a Number · 05-25-2023, 01:21 PM

There needs to be continuity between the female mount on the camera to the female mount rings on the tubes.

kypfer · 05-25-2023, 02:15 PM

Originally posted by Not a Number

Is the bayonet side of these tubes bare metal or black coated/anodized? If coated you need to remove some of the coating for the pins to work as there is no ground/earth otherwise:

See the earlier thread beginning here:
PK/A extension tubes? - Page 5 - PentaxForums.com

and here to see where about to remove the coating:
PK/A extension tubes? - Page 6 - PentaxForums.com

Originally posted by Not a Number

There needs to be continuity between the female mount on the camera to the female mount rings on the tubes.

The painted/anodized surface isn't a problem if all seven electrical contacts are implemented … one of them is a ground/common

Not a Number · 05-25-2023, 02:48 PM

Originally posted by kypfer

The painted/anodized surface isn't a problem if all seven electrical contacts are implemented … one of them is a ground/common

The seventh pin is the data pin, carries the lens info, No ground, no data flow. There's a ground wire in the bodies that connects to the bayonet mount on the body. People have broken this wire working on the mount and the mount won't work until the wire is reconnected.

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05-25-2023, 01:04 PM	#16
dionhouston Loyal Site Supporter Join Date: Apr 2022 Posts: 126 Original Poster	Originally posted by Bob 256 Printable but with electrical connections?????? There actually is conductive 3D filament, so... Actually, I was just referring to the baffles -- I should be able to print something that will cover up the tubes.

05-25-2023, 01:21 PM	#18
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	There needs to be continuity between the female mount on the camera to the female mount rings on the tubes.

05-25-2023, 02:15 PM	#19
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,600	Originally posted by Not a Number Is the bayonet side of these tubes bare metal or black coated/anodized? If coated you need to remove some of the coating for the pins to work as there is no ground/earth otherwise: See the earlier thread beginning here: PK/A extension tubes? - Page 5 - PentaxForums.com and here to see where about to remove the coating: PK/A extension tubes? - Page 6 - PentaxForums.com Originally posted by Not a Number There needs to be continuity between the female mount on the camera to the female mount rings on the tubes. The painted/anodized surface isn't a problem if all seven electrical contacts are implemented … one of them is a ground/common

05-25-2023, 02:48 PM	#20
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Originally posted by kypfer The painted/anodized surface isn't a problem if all seven electrical contacts are implemented … one of them is a ground/common The seventh pin is the data pin, carries the lens info, No ground, no data flow. There's a ground wire in the bodies that connects to the bayonet mount on the body. People have broken this wire working on the mount and the mount won't work until the wire is reconnected.

Pentax K-mount Extension Tubes ->with electrical contacts!<-

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