Extension tube question

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Michael Piziak
Michael Piziak Contributing Member • Posts: 555
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-r Pentax smc DA 18-55mm F3.5-5.6 AL Pentax smc DA 55-300mm F4.0-5.8 ED +1 more
Pentax K-r
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