General > General Technical Chat

Nikon lens compatibility (non-electronic)

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nightfire:
In your case, thats simple: No help from the camera with standard mechanical adapters, which support open-aperture focussing and then at exposure time stop down to the selected f/stop.

I don't know about the capabilities of the Z30, but for reference and for maybe users of different cameras with a similar problem: With measuring, there is the possibility to use the so called "working aperture", which means that you measure exposure at the aperture dialed in. This requires the lens/adapter combo to NOT open the aperture while focussing to the widest püosition (smallest number), but to stay fixed during that process. Of course, focusing is not that simple in this case, and might require some surgery on the adapter and the lever that operatest the aperture blades contactor at the side of the adapter.

jpanhalt:
That makes me feel better.  Now, I can use a good optical lens, which I rarely removed from my camera even after the research was done,  for little more than the cost of a McDonalds meal.  When I saw the statement about mechanical interference, I was worried.

Regards, John

bw2341:
There is a risk of mechanical interference from older pre-AI lenses. If you bought your 55mm Micro at the same time as your Nikon F, it does have a risk of damaging more recent cameras and adapters.

The link to Ken Rockwell shows images of the AI version of the 55mm Micro. Here are other Ken Rockwell links that may be helpful
https://www.kenrockwell.com/nikon/compatibility-lens.htm
https://www.kenrockwell.com/nikon/mirrorless/lenses/ftz.htm

To make the AI system, Nikon relieved the edge of the aperture ring and added a ridge to it. The lens ridge is sensed by a pin on a ring on the camera body. However, the pre-AI lenses will physically interfere with and damage the sense pin and ring on the camera.

To avoid this, the AI sense ring on early AI cameras had a tiny mechanism to release the pin and fold it outwards safely out of the way. Unfortunately, this feature was removed on many later cameras. These cameras have a risk of damage.

If your adapter is truly mechanical-only, it should be designed with enough relief so that a non-AI lens will not interfere. Check carefully as you install it for the first time.

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