Nikkor 50mm 1.8 orange slider button?

[stevem1928]

I aquired a secondhand Nikkor 50mm 1.8 AF ~ 20 years old lens. It did not come with a manual. There is a small slider with an orange mark by it. I can't figure out what it does. I think it might lock the aperture to allow auto control by the camera??? Is that correct?

[ecap]

Yes, that should be what locks your aperture ring. If it is like most other nikon lenses i believe it has to be set at F/22 and locked for auto controls.

I personally shoot minolta so i am not 100% surebut 99.9%.

[Ronnie948]

Yep, That is to lock the aperture at F/22 when using a program mode.

Ronnie

[stevem1928]

Thanks

[cfujii]

sounds like you have a Nikon AF Nikkor 50mm f/1.8s N or the later MK II version. The slide switch is the minimum apeture lock.