Re: Filters for EIR

["James Bielecki" <bieleckj@xxxxxxxxxxx>]

>Exact Filter colors vary from manufacturers. B+W's Yellow #12 >looks like Tiffen's Yellow #8, both give good results in my >opinion. I find orange filters to be a little bit too strong, but others >think they are better than the yellows. So you should probably try >them both and decide for yourself. I set my ISO to 250 and just >meter through the filter and bracket -1/2 on each frame.
>
>Peace Rolland

You folks may find it interesting that Kodak, in their Aerial Photography Manual, recommends that EIR (the 70mm and 9" stuff) be exposed through a Wratten filter #12 (deep yellow) with an exposure of 1/300 at F5.6.  We've settled on an exposure of F6.3 @ 1/500 for sunny, cloud-free conditions (which computes out to an E.I. of about 90).  This, though, is for pictures taken at altitude, which, exposure-wise, can't be equated to pictures taken on the ground.


Jim Bielecki
Silviculturist
Forest Management Division
Michigan Department of Natural Resources
1732 West M-32, Gaylord MI.  49735

*
****
*******
******************************************************
*  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  *
******************************************************