The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
OP Joseph S Wisniewski Forum Pro • Posts: 34,136
Something I forgot to mention...

Joseph S Wisniewski wrote:

Even the best and most expensive filters have parallel planes; light
bounces back and forth multiple times between those planes and cause
more internal reflections than the curved surfaces of the glass
lenses. Some of this leads to “scattering” of light, reducing
contrast. Some of the bouncing causes ghosts and lens flares. Even
the best filters degrade the image. That's one reason why camera
manufacturers now use permanently mounted “meniscus” (curved)
protectors on their expensive long telephotos. These curved
protectors don’t cause as many problems as a flat filter.

What I forgot to mention is that the problem of flare caused by reflections between the front and back surfaces of the filter is worse on wide angle lenses, because reflection from glass increases at shallow angles, and the effectiveness of the anti-reflection coatings decreases at shallow angles. So, at the time you need the coatings most, they fail to do anything.

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Rahon Klavanian 1912-2008.

Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.

Ciao! Joseph

 Joseph S Wisniewski's gear list:Joseph S Wisniewski's gear list
Canon EOS 5D Mark II Nikon D90 Nikon D2X Nikon D3 Nikon D100 +43 more
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