Focusing a Nikon 50mm f/1.2 Ai-S (at f/1.2) on Nikon DF


iKokomo 2 2
16 Sep 2020 4:13PM
I have a really neat manual focus Nikon 50mm f/1.2 Ai-S on a Nikon DF.

I have no problem focusing this (using Nikon's green arrow/dot focusing points) manually at f/3.5 or larger (which looks incredible). However, when I try to open this up at f/1.2 - 2.0 I miss 90% of the shots because they are out of focus even if the green dot focus point says it is in focus.

Other than swapping out the focusing screen to a split focusing system, is there a way to more reliable way to focus this neat lens at f/1.2-2.0?

What are some tips and tricks to using this lens?
16 Sep 2020 7:38PM
You might find using liveview (Ideally magnified) for critical focusing better at really wide apertures. This will help mostly with stationary subjects as the extremely narrow depth of field will mean that even a tiny movement of the subject or camera position will mean the focus will be out.
There’s not much you can do when using the viewfinder as far as I know!
LenShepherd 12 4.2k United Kingdom
18 Sep 2020 8:32AM

Quote:at f/1.2 - 2.0 I miss 90% of the shots because they are out of focus even if the green dot focus point says it is in focus.


The green dot is an approximation rather than the precision of zooming in on a rear monitor.
chavender Plus
9 467 1 France
18 Sep 2020 10:03AM
Apologies if I have the wrong end of the stick but does the DF have focus adjust?
My D7000 needed a slight adjustment to get spot on focus using the viewfinder.
Maybe put the camera on a tripod and focus at f1.2 using the rear screen and see if that is sharp.
thewilliam2 3 1.5k United Kingdom
18 Sep 2020 2:13PM
I had an f1.2 50mm for a while and found it all but impossible to nail focus with a D3X, which was the major reason for selling it.

Sign In

You must be a member to leave a comment.

ePHOTOzine, the web's friendliest photography community.

Join For Free

Upload photos, chat with photographers, win prizes and much more.