In a message dated 99-06-04 21:37:16 EDT, you write:
> On a related matter - can the focus at the plane of the film be any
> different that what I see in the camera? Can I see a focused image and the
> film "see" a slightly different focus? How?
>
Sure if either the focusing screen isn't set into its frame correctly or if
the stop where the mirror rests isn't adjusted correctly, the focus will be
off. If the focus screen is resting on a bit of dirt or other object, it
would force the screen closer to the lens and you would move the lens farther
away from the plane of focus, which would in turn mean that the plane of
focus in your photo would be closer than what you intended (or did I get that
backwards??).
You can check your focusing screen by placing a yardstick or other ruler
going away from you on a table. Focus at 18 inches or 6 inches. If another
mark is in focus, then your screen or mirror is off.
Warren
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