Donegan Optical Optivisor Lenses only Magnifies 2.75x & 3.50x

Description

Lens Plate No.	Magnifies	Focal Length
DA-2	1 1/2 Times	20 inches
DA-3	1 3/4 Times	14 inches
DA-4	2 Times	10 inches
DA-5	2 1/2 Times	8 inches
DA-7	2 3/4 Times	6 inches
DA-10	3 1/2 Times	4 inches

Vendor: Donegan Optical

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