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The Sigma 30mm F2.8 EX DN is a standard prime lens for Sony E and Micro Four-Thirds mounts, announced by Sigma in January 2012. Along with the Sigma 19mm F2.8 EX DN, it was part of the first release of Sigma lenses for compact interchangeable lens cameras, and hence the inception of the "DN" line, created by Sigma to cater to these cameras, [1] an offering that in January 2013 was expanded ...
In 2013, Sigma announced that the lens would be replaced by a redesigned model designated as the Sigma 30mm f / 1.4 DC HSM A; the new lens went on sale in March of that year in Canon, Nikon, and Sigma mounts. [1] Its large aperture allows for a shallow depth of field, allowing good isolation of close subjects.
Stoner 93: A reworked Stoner 63 that was tested in the early 1990s by the Royal Thai Armed Forces using an ACOG scope. [ 21 ] The most recent descendant of this line is the Stoner LMG produced by Knight's Armament Company , which has significant changes from the older Stoner 63, being based on Stoner's later model 86.
The Sigma 30mm F1.4 DC DN Contemporary lens is a fixed maximum aperture standard prime lens for Sony E, Micro Four-Thirds, Canon EF-M, and Leica L mounts, announced by Sigma in February 2016. [1] [2] The lens is the mirrorless equivalent of the Sigma 30mm f/1.4 EX DC HSM, a similar lens of a different optical formula optimized for traditional ...
The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. [6]
The locking bar system allows for even stress to be distributed and prevent canting of the scope mount. Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place.
A Zeiss rail system typically adds height to the scope body, but also gives the possibility for a slimmer scope mount so that the total scope height can become comparable to a traditional ring mount. The added scope body height due to the rail piece on the scope itself contributes about 5.5 mm (0.22 in) to the total height.
The mount is compact enough to be used on pistols, as well as rifles and shotguns. The dovetail is approximately 16.5 mm wide, and is radiused so as not to have any sharp edges. Also used on Aimpoint Acro C-2 and P-2, as well as Steiner MPS, Viridian RFX 45, CH Duty, Lucid Optics E7 [ 18 ] and Vector Frenzy Plus.