The ring is recommended because the throat of the Pro SD body is larger than the older bodies. This is to permit use of the 75mm shift lens.
The mount is the same and no light will leak in - but there is a gap where dirt and moisture might.
02-02-2013 08:20 PM
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Matt
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
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