[LRflex] Re: Query: 35mm f2.8

I really must agree with Doug.

I was shooting a subject (birds, if you must know...) with the R9 
nearly perpendicular to the sun - i.e. just after high noon with the 
lens pointing due south.

I was using the 70-180 APO which I have never known to flare.

Yet the viewfinder was a bit hazy for this particular shot which was 
wide open at just over the minimum focal distance at 1800mm.

Just by swiveling the camera 5  or 10 degrees away from the the sun on 
the same axis (tripod), the contrast in the viewfinder improved.  
Predictably, the more I rotated the camera to the west or east, the 
better the contrast in the viewfinder.

That's why I think the lens is not the culprit.  If it was between 15mm 
and 28mm, I might suggest the lens - we all know why.

Try comparing  the same sun-drenched scene through the view finder, 
pivoting away from the sun and back.  I'll bet you see just what I 
described above.

Hopefully, you have already shot a roll or two and can actually look at 
the negatives or prints - that's the real proof.



Bob in Seattle.


On Oct 23, 2006, at 13:28, telyt@xxxxxxxxxxxxx wrote:

> Not sure I buy his mirror box flare hypothesis=2E
> If the stray sight is hitting the mirror box=20
> is must be coming from somewhere - the lens perhap=3F

I agree it's a hypothesis=2E

I see it most often (with other lenses, too) when the sun is just 
outside
the picture area;  since the image circle the lens is projecting into 
the
mirror chamber is larger than the picture captured (either by film or 
by a=

sensor) the image of the sun - within the image circle but outside the
picture area - is on some surface of the mirror box=2E

The ideal mirror box would have perfect black-body surfaces from which 
no
light would be reflected; the oposite extreme would be white or 
reflective=

surfaces which would send the light from the image of the sun 
ricocheting
all over the mirror box=2E  The reality of course is somewhere in 
between,=
  as
black and non-reflective as possible (subject to marketing and cost
cosntraints)=2E  My guess is that some of the light from the sun's image
bounces around enough that it's eventually reflected toward the film 
where=

it looks like flare=2E

Doug Herr
Birdman of Sacramento
http://www=2Ewildlightphoto=2Ecom


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