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BHH, LLC has also expanded licensing of the Bell + Howell brand name for a range of products including lighting and security, personal care, tools, pest control, auto accessories and luggage. [17] [18] In 2011 a digital video recorder was released featuring the Bell + Howell brand. [19]
Angular field of view is typically specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5.8 degree (angular) field of view might be advertised as having a (linear) field of view of 102 mm per meter. As long as the FOV is less than about 10 degrees or so, the following approximation formulas ...
The binocular visual field is the superimposition of the two monocular fields. In the binocular field, the area left of the vertical meridian is referred to as the left visual field (which is located temporally for the left, and nasally for the right eye); a corresponding definition holds for the right visual field.
Parallax also affects optical instruments such as rifle scopes, binoculars, microscopes, and twin-lens reflex cameras that view objects from slightly different angles. Many animals, along with humans, have two eyes with overlapping visual fields that use parallax to gain depth perception ; this process is known as stereopsis .
All except the K1000 therefore had relatively short production lives as the M Series took over the Pentax mid-range. The KM, the cheapest of the original three cameras, was almost identical to the Spotmatic F except for the K mount and the top plate cosmetics. It used a rather dated and slow CdS (cadmium sulfide) photocell for metering.
Part of the Long Range Strike Bomber (LRS-B) program, it is to be a stealth intercontinental strategic bomber that can deliver conventional and thermonuclear weapons. Named "Raider" in honor of the Doolittle Raiders of World War II , the B-21 is meant to replace the Rockwell B-1 Lancer and Northrop Grumman B-2 Spirit by 2040, and possibly the ...
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