It will mount fine, and the matrix metering will work. However, you'll only be able to manually focus. The D5000 does not have a focusing motor in the body, and the tokina lens has no internal motor of its own. If you don't mind manually focusing, it's not a problem, but not having AF might suck for sports, concerts, and things that move.
There is Nikon F mount version for Tokina lens. Nikon D300 uess F mount, it will work for sure. But make sure to by "Nikon Mount" other than canon, petax, or some other cameras
Yes, it will fit. However, you will still need to see if the lens you have has or does not have features like autofocus or CPU connectors that will carry all the info that your camera needs... If it is a Nikon Lens it will work fine. So will others like Sigma, Tamron and Tokina. Carl Zeiss may not give you all the functions but will work in manual mode.
Nikon F mount (with AF coupling and AF contacts)
Yes, you can. Nikon uses Nikon F-mount to connect the lens to the camera. Sometimes other manufacturers change their mount, but Nikon never did, so you can still even use analog lenses.
Yes
It depends on the make of the lens and the mount type. Newer Canon lenses have an EF mount while Nikon lenses have a Nikkor mount. Though you can purchase conversion kits to put a Canon lens on a Nikon and vice versa.
It has an "F" lens mount. source: http://www.dpreview.com/reviews/nikond50/page5.asp
One can buy Tokina lens from Tokina, Amazon, Bythom, Ken Rockwell, The Digital Picture, Digitalic Camera Warehouse, Camera City, BH Photo Video and many more.
There should be a setting in the back or a switch on the outside of the lenes
ED has nothing to do with the camera mount; it is a lens (glass) quality so yes, it will fit
A Nikon EM has a standard Nikon mount, so you can use any lens that'll fit on a Nikon, except for a Nikon Series G lens, on an EM. A Series G will fit but it won't work because there's no aperture ring.
Simon Stafford has written: 'Magic Lantern Guides' -- subject(s): Handbooks, manuals, Nikon digital cameras, Digital cameras, Photography, Nikon camera, Digital techniques, Single lens reflex cameras 'Nikon Compendium' 'Nikon D5100' -- subject(s): PHOTOGRAPHY / Techniques / Lighting, Nikon digital cameras, Digital techniques, Photography, Single-lens reflex cameras, Handbooks, manuals 'Nikon D300' -- subject(s): Handbooks, manuals, Nikon digital cameras, Photography, Single-lens reflex cameras, Digital techniques 'Nikon D70' -- subject(s): Handbooks, manuals, Digital cameras, Nikon camera 'Nikon D90' -- subject(s): Nikon digital cameras, Handbooks, manuals 'Magic Lantern Guides: Nikon AF Speedlight Flash System'
. Professionals mainly use the SLR type of digital camera and sometimes use "digital backs". As for makes, my personal opinion is to go with either Canon or Nikon cameras. .