New Lens Data ?

[Archive]

[Originally posted by bozi on 2008-10-06 22:43:48-07]

hi phil,

Sigma APO 300mm F2.8 EX DG HSM gives http://temp.funtech.org/300-1-28.jpg" target="_blank">here lensid FB 54 8E 8E 24 24 4B 02,

you can see that the LensIDNumber is different from exiftools recent value '48 54 8E 8E 24 24 4B 02'.

im wondering about this, has this lens another one (additional) lensidnumber?

bye, bozi

[Archive]

[Originally posted by exiftool on 2008-10-07 11:46:39-07]

Hi Bozi,

Thanks!  Robert Rottmerhusen explains why 3rd party manufacturers
are changing the LensIDNumber in their lenses:

"The reason why the 3rd party manufacturers are using different ID's now is the
focus adjustment feature of newer Nikon pro cameras. This feature uses only
the one byte LensID to recognize a lens (again) and this was almost one
number in the past with these lenses."

So the reason is to differentiate their lenses for the new focus adjustment
feature.

- Phil