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	Introduction
	The Nikonos discovery
	The first lesson
	The second lesson
»	The third lesson
	The command dials
	The lenses
	More lenses
	DOF
	The exposure metering system
	Cancun
	More of Cancun
	Nikon School
	Still more of Cancun

The third lesson I learned  -this time it only hurt my pocket-  was how very important it is to know the lenses and what each can do for you underwater, before buying. 
 

Nikonos V with the SB-105 underwater speedlight

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At right, the Nikonos V in my wife's hands in the second dive of the day, shooting at me with the UW Nikkor 28mm f/3.5 up-close in a reef at Cancun with the SB-103 underwater flash.

My wife shooting again, maybe 20 seconds after the picture above. The flash had not fully recycle yet but, at noon, Cancun waters are very luminous, even at a depth of 60 feet.

My wife examines some sponges in the previous dive of the day, without touching. Nikonos V, W-Nikkor 35mm f/2.5