We've had several discussions about hoods, filters and
vignetting, so I thought I'd share this link from the
Wulff Photography and Design page. The writer discusses
vignetting and light fall-off. It is a good primer on
why we get dark corners on certain photos:
http://www.archiphoto.com/personal%20pages/Vignetting.html
Some lenses have physical obstructions which produce
fall-off even at small apertures. Lenses can also have
different fall-off characteristics depending on the
focus distance.
To keep the Pentax theme, here's a couple of full-frame
photos using Pentax lenses. The first was taken with
the Pentax FA* 600/f4 at f5.6, and exhibits no
vignetting:
http://web2.airmail.net/linnm3/hawk32_003.jpg
...and here's one I like. It has "good" vignetting. The
light fall-off creates a subtle frame which draws the
eye to a central subject. The light fall-off was
probably from the physical obstruction of an un-matched
teleconverter on a Pentax 200/2.5 lens at f2.5.
http://web2.airmail.net/linnm3/mallard06_002.jpg
I'm curious to see other examples of vignetting,
especially on Pentax lenses.
--
Happy Trails,
Texdance
http://members.fortunecity.com/texdance
http://members1.clubphoto.com/john8202
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