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1 mm Screw Photography Praktica: 44.40 mm 35 mm: 42 mm Bayonet Photography Exakta, Topcon RE: 44.7 mm 35 mm: 46 mm Bayonet Photography Zenit M39: 45.2 mm 35 mm: M39: 1 mm Screw Photography M37 45.46 mm 35 mm: 37 mm 1 mm Screw Photography Asahiflex: M42: 45.46 mm 35 mm: 42 mm 1 mm Screw Photography Praktica, [11] Pentax, Zenit B4-mount: 48 mm 2/ ...
Cambo lens board with Copal #1. A lens board or lensboard is a photographic part used for securing a lens to the front standard of a large format view camera. [1] The lens board itself is usually flat, square, and made of metal (most commonly aluminum), wood, or plastic. The lens board will have a hole of various diameters drilled dead center ...
The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch. (The M42 lens mount should not be confused with the T-mount , which shares the 42 mm throat diameter, but differs by having a 0.75 mm thread pitch.)
The pitch of 0BA is 1 mm and the pitch of each higher numbered thread is obtained by multiplying the pitch of the lower number by 0.9 so K-BA has a pitch of p = 0.9 K [4]: 12 rounded to two significant figures in mm. The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats ...
A bayonet mount A bayonet mount before and after insertion Early-19th century socket bayonet Socket of a bayonet. A bayonet mount (mainly as a method of mechanical attachment, such as fitting a lens to a camera using a matching lens mount) or bayonet connector (for electrical use) is a fastening mechanism consisting of a cylindrical male side with one or more radial pegs, and a female receptor ...