[davidmanze]

Popo is right. An adapter does add instability, as it is one mechanical connection adding tolerances. Meaning, with heavy glass in front of the adapter, you will have to say Goodbye to centering. The lenses usually are pulled towards the mount by springs. Adding one set more will have an impact, trust us, dave.

    

 

 

  I'm going to talk basic engineering here! 

 

        I am not talking about TPM adapters in this (my) Nikon reference to this thread, I'm talking about an OEM adapter made by "Nikon" especially to adapt the F mount to a new Nikon ML mount.

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<p style="font-size:14px;">  The Nikon TC14E II tele-converter is well constructed on a metal body,  there is a sense of precision when mounting to say the 500mm F4, all 4.2 Kgs of it! ..........so Nikon know how to make a good tele/extension tube. 

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<p style="font-size:14px;">  The lenses usually are pulled towards the mount by springs.  

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      ​Errr no!  A well fitting pair of bayonets have no play, the male's lugs locate behind the female's when turning and locking the lens, they are mechanically "locked" together!

<p style="font-size:14px;">   With a good metal bayonet (chromed brass), the springs are there "to provide an even resistance when mounting the lens, they "do not support the lens at all" only the lugs do!    except on cheap crappy Chinese ones!

<p style="font-size:14px;">  So it's all a question of quality manufacture, if done well, you keep solidity and alignment (centering).......if you can make a Rolex?   n'est pas JoJu?   

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<p style="font-size:14px;">  The Meike extension tubes I bought are cheap and poorly constructed, their contacts did not line up and the body contacts and the aperture lever wasn't free  etc....I have fixed two of them and need a miniature resistor for the third*..

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<p style="font-size:14px;">BTW..... The Meike female aluminum bayonet is not a complete aluminum bayonet, it has plastic lugs, part of the plastic body, it's Achilles heel...... No buy!  :o 

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<p style="font-size:14px;">    Bearing in mind this blog is about "whether Nikon should continue with a new ML mount or stay with it's F mount for ML"......, (kinda big important decision for Nikon no?)

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<p style="font-size:14px;">  So here the adapter would be a "bridge in time"crossing the existing Nikon F lenses to cover the new short registration ML lenses that would be coming out,.....  as time passes the ML lenses would dominate without an adapter!

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<p style="font-size:14px;">  Unless some here think that the F mount should remain on ML?