In a message dated 98-08-14 Winsor wrote:
<< Several people commented on the improved "bokeh" viewing through the new 2
series screens. I think I must disagree. If you look at any vertical
lines or verticals mixed with horizontal lines that are out of focus such
as a background for an indoor portrait, you get very wierd interference
patterns. I have noted this with out of focus books in a bookshelf and
window frame moldings. Miniblinds near the vertical edge of the window
produce an alternating checkerboard pattern almost like pixels. The same
situations with an I-13 produce out of focus images that closely resemble
an out of focus image on film. I guess everyone has their preferences. >>
snip
Once the excitement of getting a 2 series screen wore off (gee! it's like
having a brand new camera) I began to notice the differences in out of focus
effects. It was most noticable with the 85/2. The backgrounds seemed to be
more defined than they should be, like I was using an f2.8 or f4 lens. IMHO
there is a handicap in the previewing capability of the 2-series screens. But
I must say that the increase in brightness far outweighs the decrease in
bokeh.
Like Winsor, I too have noticed the wierd diffraction patterns of the 2 series
screens. I have also noticed a similar effect with the 1-8 screen, probably
attributable to the finer matte surface of these screens? Theres got to be a
scientific explaination for this effect but I'm no physics expert. Maybe Lee
H. can shed some light <g> on this.
Bill Rice
RLB, Illinois
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