Contax N mount

  • What do you mean by N-mount ?
  • How do I tell if I have a N-mount lens ?
  • How many Contax N-mount lenses were made?


  • Compatibility chart
  • Can you convert lens X to mount on camera Y in the future?
  • I do not need autofocus. Would you sell/fabricate an adapter to mount a Contax N-mount lens on a Nikon/Olympus/Panasonic/Pentax/Sony camera body?
  • Do you license any technology from any OEM?
  • Are there any known issues with your product?
  • My 24-85 displays f/5.0 instead of f/4.5 at the tele end. Is it a problem?
  • EXIF says the focal length is 86mm instead of 85mm. Is that a problem?
  • Are there infinity focusing issues with a converted Contax N mount lens?
  • Are there mirror clearance problems with a converted Contax N-mount lens?


  • Can I declick the aperture ring of a Contax N lens for cinematographic work?

General questions

  • What does your product do ?
  • How does your product work?
  • Why do I want to do it?
  • Where are you located?
  • What is the significance of your product?
  • What does the name conurus mean?
  • I emailed you a while ago to order your product but got no reply. How come?

Product questions

  • Can I buy the modification kit without installation?
  • Does the modification void my warranty?
  • Why don't you make an adapter which simply attaches to a N-mount lens?


  • My modified Contax N lens has a problem. How do I get it repaired?

Shipping your lens to us

  • Can I buy a lens from a vendor and have that vendor ship directly to you?
  • Is it safe to ship lenses by the post office?
  • Help! My package is stuck at customs!
  • Help! I sent my lenses to you but when I track the package using the post office's web site it says 'failed delivery attempt'!

Getting your lens back

  • According to the lens tracking system, the lens has been successfully converted, and I have already paid, but there is no shipping information. How come?
  • Can you mark the shipment as 'gift'?
  • It is not fair! Why some other customer got serviced very quickly but I have waited for longer than your estimates?