Nodal Point of the Tokina 10-17

[Nicolas Burtey]

Hi,

Somebody knows where is the nodal point for the Tokina 10-17 ?

I'd like to have the nodal point for 10 mm / 4 shots and for 17 mm ( I
don't know how many shot is needed with this lens at 17mm and a 5D to
make a cylinder, between 6 and 8 probably).

I assume, at 10 mm / 4 shots, the point is very close from the glass,
like the nikkor 10.5 and sigma 8.

I will do my own test when I'll have my lens of course, but it's good
to have some idea.

Best Regards,
Nicolas Burtey.

[michel thoby]

I shall insert my answer:

Le 8 août 07 à 21:44, Nicolas Burtey a écrit :

> Hi,
>
> Somebody knows where is the nodal point for the Tokina 10-17 ?
  Yes;-)
>
> I'd like to have the nodal point for 10 mm / 4 shots and for 17 mm
May I assume that you intend to shave the lens for that?

> (I don't know how many shot is needed with this lens at 17 mm
> and a 5D to make a cylinder, between 6 and 8 probably).
Yes, 6 shots around are sufficient and you may shoot two row +/- 45°  
for instance.
>
> I assume, at 10 mm / 4 shots, the point is very close from the glass,
> like the nikkor 10.5 and sigma 8.
http://michel.thoby.free.fr/Tokina_10_17/NPP-Tokina.jpg
Please take note that for six shots and 17 mm, the NPP is some  
millimeters backwards from the shown position.
To put it simply: the NPP is about fixed from 10 mm (four shots  
around) to 17 mm (six shots around).

>
> I will do my own test when I'll have my lens of course, but it's good
> to have some idea.
>
> Best Regards,
> Nicolas Burtey.

Hope this helps.

Michel

[Non-text portions of this message have been removed]

[Nicolas Burtey]

merci :-)