Ai lenses allowed carefree lens mounting and ended the double twisting that used to allow observers to spot a nikon nikkormat user from a hundred paces.
Lens coupling ring.
They allow you to connect two lenses by their filter mounts.
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The reverse coupling ring makes it possible to attach the two lenses face to face.
Nikkor ai lenses had a meter coupling ridge cam on the lens aperture ring that pushed on a spring loaded meter coupling lever on the photomic head to transfer aperture setting information.
B two lenses connected via the coupling ring.
The magnification power is the ratio of the 2 focal lengths.
Compatiable for male thread at both sides.
A 58mm diameter coupling ring.
Be aware that a heavy lens coupled to a camera mounted lighter or less solidly built lens can result in damage to one or both lenses because of the weight and stress placed on their front ends.
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The lens that is furthest from the camera is mounted in reverse and acts as a powerful and well corrected close up lens a 50 mm lens is 20 dioptres much stronger than normal close up lenses.
The lens attached to the camera must be the long focal length one.
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One side screws into the filter thread of the first lens and the other screws into the filter threads of the reversed lens.
A macro coupling ring has male filter threads on both sides so you can stack one lens onto another facing each other.
77mm camera with 77mm female front threaded lens.
The lenses are connected with a coupling ring.
It will work by reversing a standard lens to the front of a telephoto lens.
Coupling rings are adapters with a male filter thread on each side.
Either lens can be mounted to the camera.
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