The points being made about labeling switches have rather missed the point I was
trying to make.
I never said that switches shouldn't be labeled in some way. Why shouldn't they?
How are you otherwise supposed to know what they do?
The point I was trying to get at (and which I thought I made clear -- "he said,
testily") is that many Japanese products of the '60s, '70s, and '80s had two
little icons showing pushbutton switches "up" and "down" and what it did at each
position. As I pointed out, this is unnecessary, because most people intuitively
know that pushing a button activates the associated function.
This excessive labeling is simply stupid, and has nothing to do with legal
liability or labeling ladders -- which are labels of an altogether different
sort.
>>>>>
If you're trying to focus critically, you _don't_ want a focusing screen with a
45 degree split image. The only purpose of a slanted rangefinder is that it
allows focusing on either vertical or horizontal lines. It is otherwise _less_
accurate, because it is more difficult to see when diagonal lines are correctly
aligned.
As for exposure... the focusing screen _obviously_ has no effect on OTF
readings, or those made via a cell in the camera body. Manual exposures on the
OM-4 are made via the latter.
I confirmed this by substituting the clear 1-6 screen for the frosted screen I
normally use. There was _no_ difference in manual exposure.
To paraphrase Mr. Lizard -- "You need a new salesman!"
>>>>>
"At subject distances much less than hyperfocal distance, two lenses of
different focal length will exhibit the same depth of field when using the same
aperture and magnification."
This _should_ read:
"...lenses of different focal length at the same distance from the subject will
exhibit the same depth of field when using the same aperture diameter and final
image magnification."
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