I made a google on "film camera haloing" and found one image that's
described as a halo. The page is
http://www.skyandtelescope.com/community/gallery/celestial?page=48&c=y&archive=true
The picture is the last one near the bottom. It's description:
Photographer
P-M Hedén
Location
Vallentuna, Sweden
Date
February, 2006
Equipment
20mm objective, Practika SLR camera. Recorded on Kodak 100VS film.
Description
Going home after work I saw this fantastic Solar halo. I hurried
home to get my camera and managed to photograph it exactly when a
condensation trail from an airplane went through it.
If you click the image, it a large version will show up:
http://media.skyandtelescope.com/images/Sunhalo.jpg
I'm presenting this page not to answer James Shenken's question, but to
ask if this image, taken by film, would pass as a halo similar to a halo
taken by digicam. There seems to be a difference in circumstance, as
this halo is an astronomical creation, and not one dependent on lens or
sensor.
Elson T. Elizaga
Nazca Graphic Design & Photography
http://nazca.elizaga.net
James Schenken wrote:
It seems that 'blooming' in a film camera can occur when the light
intensity in an area is such that the adjacent areas get some of the
photons that are not absorbed by the silver crystals. For this to
happen in a digital camera, the individual pixel sensors would have to
have at least semi-transparent walls that allowed reflected light to
pass to adjacent sensors. To get significant 'blooming', the light
intensity would have to be such that the adjacent sensors would pass
it on, so to speak.
Does anyone know if the side walls on image pixel sensors are at all
transparent or not?
For 'haloing' to occur in a digital camera, the software that does the
interpolation to fill in the missing colors and adjusts the contrast
could easily do this. You get the same effect by over sharpening in
the image processing software. I'm not aware of a process that
yields haloing in a film camera while the film is still in the
camera. Help me if someone on the list does know how this might happen/
Cheers,
James
At 09:53 AM 12/29/2007 +0800, you wrote:
Eslon writes:
: I wonder why it seems to be seen as an aberration in this review of
the
: Nikon D300:
:
: "The camera was loved for its "brilliant" image quality, its good
colour
: balance, low noise and its LCD. However at times the D300 produced
some
: minor haloing in high contrast areas."
odd! they must have meant blooming I guess
k
James Schenken
