On Fri, 19 Mar 1999 17:15:24 +1300 Bob Halberstadt <[EMAIL PROTECTED]> wrote:
>Nikon AF70-300D ED Compared
>
> Nikon Tamron
>
>Filter 62mm 58mm
>Front Element 2.2mm larger-1/4 stop brighter on Nikon
>Focus Right (like all Nikons) Focus Left
>Minimum Aperture Lock Standard Aperture Lock not like Nikons
>Minimum Aperture F32 F22
>Multicoated Elements 10 6
>Nikon CPU Tamron CPU
>Mount screwed on Mount crimped on
>Dull Reflections Brighter Reflections
>(duller reflections = more transmission less reflection)
>Nikon ED Glass Tamron LD glass
>Surface texture better Surface texture has cheaper feel
Here are some other stats:
Nikon Tamron
elements 13 13
groups 9 9
Min focus 1.5m 1.5m
weight 18.2oz 18.0oz
width 2.9in 2.9in
length 4.9in 4.5in (about a 1cm difference-not much)
These look pretty similar, and the optical formulas appear to be identical. I
don't think it would be difficult to replace the aperture stop down mechanism so
it stops down to f/32, nor would it be difficult to add an extra gear so the
focus ring rotates a different way, or coat a couple more elements. The filter
ring diameter is simply a matter of using a consistent size within a lens
family. Rebadged lenses often feel different from each other, even though they
are identical from an optical standpoint.
