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Nikon Spotters Specifications

Model	Model #	Size	FOV-angle	FOV-linear	Eye Relief	Near Focus	Wgt.
			degrees	feet	mm	feet	oz.
16-47X60 Spotter XL WP	7900	60 mm	3	156	14.5	50	26.5
60mm straight	7351	60 mm	2.5	131	14.5	16.5	33.8
60mm angled	7352/7675	60 mm	2.5	131	14.5	16.5	33
80mm straight	7451	80 mm
80mm angled	7452/7675	80 mm
Fieldscope III straight	7393/7670	60 mm	3	156	15.2	50	39
Fieldscope III angled	7394/7670	60 mm	3	156	15.2	50	43
Fieldscope III ED	7395/7670	60 mm
Fieldscope III ED angled	7396/7670	60 mm
Fieldscope 78mm ED	7898/7670	78 mm	2.4	126	15.2	50	56.8
Fieldscope 78mm ED angled	7899/7670	78 mm	2.4	126	15.2	50	50.6

Prior to the beginning of the ice age about 2 million years ago, the present Great Lake area was occupied by a river drainage system that emptied into the area of Hudson's bay.

The current pattern of the Great Lakes mimics that of this ancient river system because the glaciers moved into the valleys from the north and greatly deepened them to form basins which were then filled with meltwaters when they retreated 10,000 years ago.

Sediment from land areas is gradually being carried into these basins, by wind, water currents, and people. It will continue to do so until the Great Lakes are eventually filled up and are no more.