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Do any of your extension tubes mate with the Oly teleconverters?

Started Feb 23, 2021 | Questions thread
Peter 1745 Senior Member • Posts: 2,022
Re: Do any of your extension tubes mate with the Oly teleconverters?

stokey wrote:

Peter 1745 wrote:

Pixco extension tubes are similar to Fotga ones in their sizing and materials. The 10mm is wide but not long enough and the 16mm is long but not wide enough (in it's unmodified form) but the 16mm is easy to modify. Both brands offer pass through electronics so AF and aperture lens control works normally.

I have just tried a set of Fotga tubes and although they autofocus and pass through the aperture when connected directly to the camera they do not do so when attached to my MC20. I wondered if the fact that the two extra contacts on the MC20 are "open" could affect the transmission of the standard pins. How can my set-up differ from yours ? Maybe there is a difference between MC20 and MC14.

Bob

I don't have an MC20 so check on my tubes but I know other people have successfully used Fotga tubes with the MC20. My MC14 works with both contacts "open" and I don't think the MC20 would work differently.

Failure of extension tubes to connect electronically is often due to the hole on the metal part of the mount, which accepts the mounts contact pin, being slightly too small.

Previous post on the subject

https://www.dpreview.com/forums/post/63582773

It may be the pin on the MC20 is slightly larger than the pin on the camera. The hole on the tube may be big enough for the pin on the camera but not for the pin on the tube, preventing the pin from fully extending, which in turn stops the switch on the base of the pin being activated and the camera recognising the device is connected.

A simple solution is to make the hole on the tube slightly larger.

In the pictures below the Fotga tube is on the left and the MC14 is on the right.

The contact pin and the corresponding hole are at the 12 o'clock position. Note than the hole on my Fotga tube is bigger and less precisely cut,  (I haven't modified it myself).

Contact pin/switch at 12 o'clock on the metal part of the mounts.

Contact pin/switch receiving hole at 12 o'clock on the metal part of the mounts.

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Regards,
Peter
'Keep taking the photos'

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