Well my eye sight is finally catching up to my hairline. I need reading glasses and the lasik for distance is changing. I haven't been wearing glasses to focus. Should I wear my glasses when manually focusing? How do I re-adjust the diopter properly to see everything clearly again? Thanks.
>How do I re-adjust the diopter properly to see everything >clearly again?
My usual procedure is this... remove the lens, turn the camera on and point it at a plain, pale wall or other surface. While viewing through whatever eyesight aids you would use to shoot, simply turn the dioptre adjustment knob until the etched focus area outline looks sharpest.
Not really. If you don't have the dioptre adjusted for your vision (with or without glasses), it will just make the viewfinder more blurry, not the captured image. It might make it more difficult to focus accurately in MF, because you'd be comparing an unsharp view with a less unsharp view.
Once you have set the viewfinder to focus on the frame with your glasses off the focus lens for the viewfinder is acting like glasses lens for viewing the viewfinder frame and anything projected at that distance. Not have a a focused object, removes the distraction of an image and lets you focus on the information border. You will need to use the viewfinder without your glasses.
If you use a single focus point, and switch your lens to manual you can try to focus on the subject and observe what happens. Look for the "In Focus" light when you have achieved focus. It should be on.
If you are not satisfied and want to go back to a zero adjustment, there is indent that allows you to set the viewfinder back to no zero diopter adjustment.
Is there any particular reason you remove the lens? I have never done that and Nikon's instructions don't say to do it either. Your method, mine and Nikon's do say to adjust the diopter until the eched area focused outline looks the sharpest.
Removing the lens just lets more light hit the focusing screen - particularly if the removed lens has a slow aperture. For me, this makes it easier to see the AF area markings. It also ensures that the eye is not confused by any surface features on the wall being pointed at, but that could be achieved with a lens mounted, by de-focusing it.
Like Brian, I also take the lens off, point to a white wall to just see the etchings on the focusing screen, and dial in the correct diopter setting to make it as sharp as possible. I believe that this may be in my F100 manual (I'd have to check mine), but the principle is the same.
I checked the D700 manual, and true, it doesn't say anything about doing that.
I also checked Thom Hogan's book and he simply suggests defocusing and pointing to a blue sky, then dialing in the diopter setting.
While on the subject, I haven't checked this, but apparently before removing the eyepiece to clean it, etc., one should lock the viewfinder cover, then take off the eyepiece. There is a locking mechanism that is in place to avoid the eyepiece from coming off too easily. I'll have to check that more closely too.