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Extension tube pre Ai
Feb 21, 2021 09:27:42   #
Gianfranco47 Loc: Senoia GA
 
One of my friend has fitted on Nikon d750 one extension tube not modified , that is means pre Ai , now tube is fitted but cannot be taking out , is there any possibility to do it without bringing the camera to assistance center ?

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Feb 21, 2021 13:36:24   #
RWR Loc: La Mesa, CA
 
Gianfranco47 wrote:
One of my friend has fitted on Nikon d750 one extension tube not modified , that is means pre Ai , now tube is fitted but cannot be taking out , is there any possibility to do it without bringing the camera to assistance center ?

Which non-Ai tube is it?

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Feb 21, 2021 18:00:00   #
User ID
 
RWR wrote:
Which non-Ai tube is it?

Why would you ask that ?

Could be the old M-ring or P-ring that accompanied the pre-Ai 55/3.5 micro. Maybe it’s the K-tube adapter. They all present the same problem, and all call for the same solution.

Doesn’t really matter which tube. The butt end structure is identical on all of them. The rim of the tube is jammed up against the black plastic Ai aperture tracer ring. (Ai and AF tubes and lenses do not have that rim.)

Either the ring has already cracked under pressure or it hasn’t. Get a grip on the tube and twist it off against the friction. Then make sure the little tab or finger on the ring is still solidly connected and check that ring is not cracked. If the ring still rotates easily all is well.

The metering component driven by the moving tracer ring was never under any pressure, so no hidden internal damage. Everything you need to inspect is visible externally. If the plastic part is damaged or doesn’t rotate easily and return itself to its parking place, then ship it off to Nikon USA. Figger about $350 (includes a sensor cleaning and all new exterior rubber parts).

Otherwise, just don’t do that again !

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Feb 21, 2021 20:41:26   #
RWR Loc: La Mesa, CA
 
User ID wrote:
Why would you ask that ?

Could be the old M-ring or P-ring that accompanied the pre-Ai 55/3.5 micro. Maybe it’s the K-tube adapter. They all present the same problem, and all call for the same solution.

Doesn’t really matter which tube. The butt end structure is identical on all of them. The rim of the tube is jammed up against the black plastic Ai aperture tracer ring. (Ai and AF tubes and lenses do not have that rim.)

Either the ring has already cracked under pressure or it hasn’t. Get a grip on the tube and twist it off against the friction. Then make sure the little tab or finger on the ring is still solidly connected and check that ring is not cracked. If the ring still rotates easily all is well.

The metering component driven by the moving tracer ring was never under any pressure, so no hidden internal damage. Everything you need to inspect is visible externally. If the plastic part is damaged or doesn’t rotate easily and return itself to its parking place, then ship it off to Nikon USA. Figger about $350 (includes a sensor cleaning and all new exterior rubber parts).

Otherwise, just don’t do that again !
Why would you ask that ? br br Could be the old M... (show quote)

I ask because the flange fitting camera of the manual tubes is not the same as that of the pin and prong (non Ai) auto-aperture tubes.

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Feb 22, 2021 00:26:27   #
Leitz Loc: Solms
 
RWR wrote:
Which non-Ai tube is it?

Cannot very well advise the OP without knowing which tube is involved. Anything else is guesswork.

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Feb 22, 2021 17:03:58   #
Gianfranco47 Loc: Senoia GA
 
Camera have been repaired by Nikon center free of charge , two minutes work , thanks very much to all

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