I was wondering something similar. The background of the photo made using
the 35-70 looks as if it isn't nearly out of focus as the background from
the one made using the 50mm. It would be interesting to see how the
35-70/3.6 renders a more distant background that would be as out of focus
as the one made using the 50/1.2, and a fourth photo from the 50/1.2 with
closer background that isn't as out of focus to match the one made using
the 35-70.
-- John
At 21:31 12/6/02, Paul D. Farrar wrote:
Make sure your browser isn't set to scale graphics to the window (newer
IEs have that as default), so you can get the actual pixels. It's really
obvious on my system. The 50 has what's called "bright-ring bokeh", in
which an out-of-focus point is rendered as a dim disk with a much brighter
edge, similar to the donuts of a mirror lens. This causes lines to be
doubled and gives a real hashed-up look to backgrounds. It's often due to
the rays from the outer zone of a lens, so it can be reduced by stopping
down. The 35-70 might do the same thing if it could open up past 3.6!
Paul
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