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Extension tube question

Started Jan 24, 2021 | Discussions
Michael Piziak
Michael Piziak Contributing Member • Posts: 850
Extension tube question

I have the Asahi extension tubes.

It's interesting, 1 of the 3 tubes (the smallest one in length), will make my k-R camera's mirror flip closed (causing me only to see black in viewfinder).  It happens when being used on either a manual or auto lens.

The other 2 tubes don't do this.  What do you think is going on here?

 Michael Piziak's gear list:Michael Piziak's gear list
Pentax K-S2 Pentax smc DA 18-55mm F3.5-5.6 AL Pentax smc DA 55-300mm F4.0-5.8 ED +2 more
Pentax K-r
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Holger Bargen Veteran Member • Posts: 4,911
Re: Extension tube question

Michael Piziak wrote:

I have the Asahi extension tubes.

It's interesting, 1 of the 3 tubes (the smallest one in length), will make my k-R camera's mirror flip closed (causing me only to see black in viewfinder). It happens when being used on either a manual or auto lens.

The other 2 tubes don't do this. What do you think is going on here?

I don't have the Asahi extension tubes. However, I know that there are problems with some extension tubes that have some coating at the mount. The Pentax cameras need electrically conducting material at the mount I had a problem like this with a Novoflex lens adapter. Scratching off some paint was the solution.

 Holger Bargen's gear list:Holger Bargen's gear list
Pentax K-5 Pentax K-S1 Pentax K-1 Pentax smc DA 55-300mm F4.0-5.8 ED Sigma 70mm F2.8 EX DG Macro +7 more
Michael Piziak
OP Michael Piziak Contributing Member • Posts: 850
Re: Extension tube question

Thanks for your reply.

I'll clean off the contact mounting surface of the extension tube and see what happens.

 Michael Piziak's gear list:Michael Piziak's gear list
Pentax K-S2 Pentax smc DA 18-55mm F3.5-5.6 AL Pentax smc DA 55-300mm F4.0-5.8 ED +2 more
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