Back focus problem on Nikkor 80-200 F2.8 AF-D

[Michele Lombardo]

Hi everyone, I have a back focus problem with my zoom lens Nikkor 80-200 f2.8 AF-D. Focus doesn't remain precise if I zoom from 80 to 200 or viceversa. It's a lens problem or I have to adjust the RED back focus?

Thanks!

Michele

 

[Thomas Pohl]

That`s the disadvantage of a photo lense... if you don`t need that feature - the Nikon is still a pretty good tool.

Cheers

Thomas.

 

[Ed Watkins]

Hi everyone, I have a back focus problem with my zoom lens Nikkor 80-200 f2.8 AF-D. Focus doesn't remain precise if I zoom from 80 to 200 or viceversa. It's a lens problem or I have to adjust the RED back focus?

Thanks!

Michele

Depends, I have an 80-200mm and it holds focus pretty well throughout the range, no perfectly, but it's not too bad. I backfocused the mount specifically for the lens though.

It's certainly not equivalent to a proper CINE PL zoom, but for budget glass it ain't bad.

Ed.

 

[Michele Lombardo]

Thanks all for the replies... but I don't understand if I have to adjust the back focus.... I've never adjusted it...


Michele

 

[Jacek Zakowicz]

lens back focus

lens back focus

Back focus problems can be caused by either the camera or the lens. From your description it looks like the lens. I assume all other (wider) zooms work fine on the camera. If you have problem with the 80-200 your wide zooms would be very soft-unusable. There are procedures to determine the direction and amount of error using the camera as a precise collimation tool. Little too complicated to explain on the forum but I'll make a video for that time permitting.
In the mean time you can watch this one I made a while ago with the 11-16 Tokina- it should give you the idea http://www.youtube.com/watch?v=Fo4Byk_rGDo