This is an M42-NIKF Lens to Nikon F Mount Camera Body Adapter with flange plate.
This adaptor will mount any M42 lens to any Nikon F Mount Camera
Made
from alluminium alloy the adaptor fits the camera body physically but
not electrically, M42 lenses do not share any data with the camera.
This
adaptor has a flange plate at the bottom of the M42 thread which will
depresses the aperture pin on at the base of the lens, this is auto the
aperture pin which when depressed closes down the lens iris to the
pre-selected aperture marked on the lens barrel and this would normally
happen when the shutter is fired, the pin has been replaced on modern
DSLR's lenses with a lever.
Lens: M42 screw mount Lens eg. Pentacon, Takumar, Optomax, Zenit, Helios, Carl Zeis lens etc
Camera: Nikon F Mount Camera.
Although
the lens will fit physically, automatic diaphragm, auto-focusing, nor
any other functions will not operate correctly while using this adapter.
In
this case "stop-down mode" will need to be used when metering since the
lens does not have the ability to have its aperture controlled
by the camera body.
You can shoot with manual mode or aperture priority mode.
Focus to Infinity
This
adaptor has a 0.8mm thick outer flange, this will increase the distance
from the lens to the focal plane by 0.8mm, the result is that some
lenses will not be able to focus to infinity.