I have a D50 and I would like to use my manual focus lens (a Nikkor 50mm f/1.4 AI) from my analog SLR. It fits on the mount and all seems to be good, but the status on the LED display blinks F - - and the view also blinks F - -. When I try to press the shoot button, nothing happens. I have heard that Nikons will allow for these lenses to work. How does it work?
Answer
The "F--" indicates that the lens isn't set to its maximum aperture, or that the camera can't control the aperture directly, which is necessary for most automatic exposure.
To make this work, you'll need to do use manual mode (M), and you'll need to change the aperture using the aperture ring on the camera.
Metering won't work, the solution there is to use the histogram to judge the correct exposure.
I believe that focus confirmation will also not work, and the solution there is to do your best, and use higher apertures (f/5.6 or higher). Shooting at f/1.4 will likely be quite difficult to do reliably - it can be difficult on cameras built for manual focus; if you want to try, a good solution is to focus as best you can, then move slightly forward (maybe 5-10cm), and take several pictures, moving backwards a small amount (2cm) each time.
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