RE: Nikkor 35mm and HIE - strange hexagonal reflections

["Eric Boutilier-Brown" <ebb@xxxxxxxxxxxxxx>]

Hi Eckhard,

I wouldn't rule out flare, as that is certainly what it looks like to me. I
suspect the IR from the tree and grass was bright enough to flare into the
centre of the image; the hexagonal shape would certainly seem to mirror the
aperture blades. In the past I have managed to get flare on conventional
film when pointing the camera towards a  very bright object.

That would be my guess.

e.

Eric Boutilier-Brown
Halifax, Nova Scotia

Evolving Beauty
http://www.ebb.ns.ca

> on some HIE-pictures I shot recently, I found a strange hexagonal area
> of slightly higher density in the middle of the frame. You can see an
> example at http://www.eckhards-photobox.de/HIE.jpg . (Sorry for the
> lousy quality, I simply scanned the neg on a normal office scanner...).
> The hexagon only occured with a used Nikkor 35mm 1:2,8 lens that I
> recently bought and that works well with non-IR films. The higher
> density area was stronger visible with a Heliopan RG 780 (=Wratten 87)
> than with my red #25. Other lenses than the 35mm performed well, so I
> think it is a problem with this special lens, not with the camera (a
> Nikon F3). My first idea was, that light was reflected from the
> backplate on the aperture blades and from there back on the film.
> However, in this case the hexagon would have shown less density than the
> surrounding areas, wouldn't it? Flares can be ruled out, since I had the
> sun directly in the back an the camera's viewfinder was covered with the
> built-in curtain.
> Any ideas what it might have been?
>

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