Stuck Vivitar Matched TC - Help!!

pbo · 05-26-2009, 11:21 AM

A really lame thing happened today - I just got a TC from a fellow forum member here. I mounted it on the camera, played around a bit, and tried to unmount it; somehow, it didn't want to get unmounted and stopped in the middle. I tried to push it further with a bit more force, but it didn't budge. I am really not sure what to do now - I tried to dismantle it, but unscrewing screws from the top didn't seem to help...
The TC is a Vivitar 70-150mm matched TC, in PK mount. Anyone got any ideas on what to do?

**pentaxman** · 05-26-2009, 01:53 PM

If the lens also accomodates Ricoh cameras, there may be a pin on the lens that is hanging up in the Pentax mount. I have heard that sometimes you can take a feeler guage and slide it between the lens and the mount and wiggle the pin up and out of the way. It is worth a try.

Tom

Jester_rm · 05-26-2009, 06:02 PM

Hmm...are you sure it's not a Ricoh version? I'm looking at mine right now (just P/K) and there's no protrusions on the base at all that I can see that would be catching on anything.

Although, there are 4 screws on the baseplate, I suppose it's possible that one of them is backed out slightly and has caught someplace on the mount?

pbo · 05-26-2009, 07:02 PM

I got it out... at a cost - my SDM/Powerzoom contacts are screwed up... There was some thing screwed to the bottom of it - I have no idea for what reason; anyways, I opened it and took out all insides, and now it's a pretty good extension tube

**ismaelg** · 05-26-2009, 07:13 PM

First of all try not to panic. I know it is not easy.
Most likely that is caused by the mentioned Ricoh pin. Here is a link to my question regarding it and there are some links in the responses that may help.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/59197-how-can-...nned-lens.html
Try a feeler gauge: the thin calibrated strips used to measure spark plug gaps and such. Or anything flat and thin but strong. Maybe a jeweler's flat screwdriver. Looking at the camera from the front, the pin should be located at about 5 o'clock in the lens. Carefully try the gauge from that position upwards, depending on how far the lens is from seating right.
Once out, you can perform a simple surgery to remove the pin and prevent it from happening again.
Best of luck! Let us know how it goes.

Thanks,

05-26-2009, 11:21 AM	#1
pbo Veteran Member Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 891	Stuck Vivitar Matched TC - Help!! A really lame thing happened today - I just got a TC from a fellow forum member here. I mounted it on the camera, played around a bit, and tried to unmount it; somehow, it didn't want to get unmounted and stopped in the middle. I tried to push it further with a bit more force, but it didn't budge. I am really not sure what to do now - I tried to dismantle it, but unscrewing screws from the top didn't seem to help... The TC is a Vivitar 70-150mm matched TC, in PK mount. Anyone got any ideas on what to do?

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05-26-2009, 01:53 PM	#2
pentaxman Site Supporter Join Date: Oct 2007 Location: Washington Photos: Gallery Posts: 250	If the lens also accomodates Ricoh cameras, there may be a pin on the lens that is hanging up in the Pentax mount. I have heard that sometimes you can take a feeler guage and slide it between the lens and the mount and wiggle the pin up and out of the way. It is worth a try. Tom

05-26-2009, 06:02 PM	#3
Jester_rm Senior Member Join Date: Jun 2007 Location: Redmond, Oregon Photos: Gallery Posts: 228	Hmm...are you sure it's not a Ricoh version? I'm looking at mine right now (just P/K) and there's no protrusions on the base at all that I can see that would be catching on anything. Although, there are 4 screws on the baseplate, I suppose it's possible that one of them is backed out slightly and has caught someplace on the mount?

05-26-2009, 07:02 PM	#4
pbo Veteran Member Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 891 Original Poster	I got it out... at a cost - my SDM/Powerzoom contacts are screwed up... There was some thing screwed to the bottom of it - I have no idea for what reason; anyways, I opened it and took out all insides, and now it's a pretty good extension tube

05-26-2009, 07:13 PM	#5
ismaelg Loyal Site Supporter Join Date: Apr 2009 Location: Puerto Rico Photos: Gallery Posts: 2,681	First of all try not to panic. I know it is not easy. Most likely that is caused by the mentioned Ricoh pin. Here is a link to my question regarding it and there are some links in the responses that may help. https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/59197-how-can-...nned-lens.html Try a feeler gauge: the thin calibrated strips used to measure spark plug gaps and such. Or anything flat and thin but strong. Maybe a jeweler's flat screwdriver. Looking at the camera from the front, the pin should be located at about 5 o'clock in the lens. Carefully try the gauge from that position upwards, depending on how far the lens is from seating right. Once out, you can perform a simple surgery to remove the pin and prevent it from happening again. Best of luck! Let us know how it goes. Thanks,