>I picked up a set of Pentax Auto Extension Tubes Set B (w/automatic >diaphragm >operation and open-aperture metering) from eBay. They look like new >except that I noticed that the diaphragm in #3 (26mm) tube seems stiff >compared to the other two. For example, when I put the tube on the camera >and then mount a lens, it is hard to open up the lens to the faster f-stops >(f/4, f/2.8, etc...). The other two tubes work perfect (not stiff). > >Any suggestions??? Does it need to be lubricated?
As I remember, nothing is lubricated. I have this set too, but I removed all springs so that I can stack them up without too much force on the aperture ring. regards, Alan Chan _________________________________________________________________ Join the world�s largest e-mail service with MSN Hotmail. http://www.hotmail.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
