Re: Refocusing for IR photography using Nikon ED glass lenses.

[Joe Berenbaum <joe-b@xxxxxxxxxxxx>]

At 00:11 08/11/97 -0500, you wrote:
>I also read the following in Theresa Airey's Book, Creative Printmaking:
>"IR radiation doesn't focus on the same plan as visible light, so you must
>roate the lens barrel slightly forward to readjust your focus to the IR
>compensation mark.........But with some of the new autofocus (AF) lenses,
>such as most of Nikon's AF lenses, this isn't necessary (the exception:
>Nikon's 80-200mm f/3.5-5.6 D lens).  through the use of extra low dispersion
>(Ed) glass, these lense can pull all the wavelengths into focus, including
>the infrared ones."
>
>I know the Nikkor 80-200mm ED f/2.8D AF lens also needs to be refocused
>because it has an IR refocus mark.  So obviously the above statement is
>rather vague.
>My question is "Which Nikkor ED lenses have you used that do not require an
>IR focusing adjustment?"
>I'm sure other listmembers would find this information interesting.
>Thanks, Rolland

The only such lens I've got is the Nikon 180/2.8 AFED 1st version, and it
has an IR focusing mark.

Joe Berenbaum

*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------