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Reverting a modified lens back to N-mount

 
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conurus
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Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Tue Aug 15, 2006 7:00 am    Post subject: Reverting a modified lens back to N-mount Reply with quote

Reversibility is a concern for some of our customers. You would have to pick one of the following N lenses whose conversion is reversible if done properly: MS100, VS70-300, VS28-80 and VS70-200.

These ones, however, are irreversible: VS24-85, P85, P50, VS17-35 and APO 400/4. These lenses can still be restored to N-mount, but you will leave traces that they have been converted before - we have a very strict definition of reversibility here.

During installation, your camera repair professional removes the right combination of copper spacers to ensure the back focus distance is correct. If a spacer is thick, it is made of brass and brass has good corrosion resistance. If the spacer is thin, it is made of copper and will tarnish if exposed to air and moisture. Oil and fingerprints may accelerate the process. Although the spacers are inside the lens and they are not visible, it is still a good idea to store the spare parts in a moisture-free environment just in case you wish to revert the lens to N-mount in the future. There are many commercial products for removing copper tarnish, but we do not recommend using them. You do not want to put such chemicals inside the lens. Prevention is better.

We believe once you try a converted N-mount lens on an EF-mount body, you will be fully convinced this is the right way to go and you will never look back again. It is possible to revert some lenses back to N-mount, however, if the installation is performed with care and the spare parts are stored properly.
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MomoInu



Joined: 15 Aug 2006
Posts: 68
Location: Santa Fe, NM

PostPosted: Tue Aug 15, 2006 7:00 am    Post subject: Reply with quote

I would think the only reason to convert them back is if the Contax brand was re-started with a new DSLR using the same lens mount. Right now, that doesn't look probably, but it is possible.

As long as the lens could be used again with the N-mount, even if there are signs that is was once converted, is good enough for me.
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conurus
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Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Tue Aug 15, 2006 7:00 am    Post subject: Reply with quote

As of today, there is no confirmed news of any kind concerning the revival of the Contax brand.

No one is able to predict what will happen in the future. I just wish to point out that in the end it is conurus which offers a migration path for N-mount owners to continue to upgrade and expand their system. You, our customer, invested significantly in N-mount lenses and we want to help you maximize their potential on current-generation DSLR cameras.

We are disappointed that all Contax products have been discontinued, but we want to take some concrete action about it. Those fabulous N-mount lenses are in need of a new DSLR body, and we can make that happen.
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MomoInu



Joined: 15 Aug 2006
Posts: 68
Location: Santa Fe, NM

PostPosted: Tue Aug 15, 2006 7:01 am    Post subject: Reply with quote

conurus wrote:

We are disappointed that all Contax products have been discontinued, but we want to take some concrete action about it. Those fabulous N-mount lenses are in need of a new DSLR body, and we can make that happen.

Yes, the N-mount lenses deserve a new life. And, without the prospect of a new Contax, I'll be converting at least one of my N-mounts lenses. Any word on when we will be able to place an order? I am even willing to do a test conversion for you to help you finalize the design or instructions.
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