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<blockquote data-quote="Bob Blaylock" data-source="post: 299463" data-attributes="member: 16749">As has been pointed out, the “ugly fork” is to couple the aperture ring to older, pre-AI Nikon cameras.&nbsp; AI cameras (1978 and newer) don't use it, and many lenses have it just to be able to work on the older Nikons.&nbsp; The F6 doesn't use it.&nbsp; Neither do the F5, F4, or F3.&nbsp; Earlier versions of the F2 used it, but the later versions, the F2A and F2AS, do not.&nbsp; One thing I am wondering, from your post, is if you understand that different manufacturers use different mounts, and that in order to mount a lens on a Nikon, it needs to have a Nikon F-mount.&nbsp; If this “Zeiss Otus” is made to mount on your Leica, then it won't mount on a Nikon; nor will a lens made to mount on a Nikon mount on a Leica.&nbsp; If the lens in question has a Nikon F-mount, then it will mount and work just fine on the F6, with or without the “ugly fork”.&nbsp; The one caution is that if the “ugly fork” is solid, that is, if it does not have the holes shown on the one in your picture to either side of the slot, then it's a non-AI lens, and I am given to understand that some AI bodies can be damaged by attempting to mount a non-AI lens.</blockquote>

[QUOTE="Bob Blaylock, post: 299463, member: 16749"] As has been pointed out, the “ugly fork” is to couple the aperture ring to older, pre-AI Nikon cameras. AI cameras (1978 and newer) don't use it, and many lenses have it just to be able to work on the older Nikons. The F6 doesn't use it. Neither do the F5, F4, or F3. Earlier versions of the F2 used it, but the later versions, the F2A and F2AS, do not. One thing I am wondering, from your post, is if you understand that different manufacturers use different mounts, and that in order to mount a lens on a Nikon, it needs to have a Nikon F-mount. If this [i]“Zeiss Otus”[/i] is made to mount on your Leica, then it won't mount on a Nikon; nor will a lens made to mount on a Nikon mount on a Leica. If the lens in question has a Nikon F-mount, then it will mount and work just fine on the F6, with or without the “ugly fork”. The one caution is that if the “ugly fork” is solid, that is, if it does not have the holes shown on the one in your picture to either side of the slot, then it's a non-AI lens, and I am given to understand that some AI bodies can be damaged by attempting to mount a non-AI lens. [/QUOTE]

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