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This allows the development of an equilibrium between the liquid and the air volume. The ignition source is directed into the cup at regular intervals with simultaneous interruption of stirring. The test concludes upon observation of a flash that spreads throughout the inside of the cup. The corresponding temperature is the liquid's flash point.
The TAG flash point tester adheres to ASTM D56 and has no stirrer, while the Abel flash point testers adheres to IP 170 and ISO 13736 and has a stirring motor so the sample is stirred during testing. The flash point is an empirical measurement rather than a fundamental physical parameter.
Pentax 02 Standard Zoom (2011) — 28–80 mm equivalent; Pentax 03 Fisheye (2011) — 17.5 mm equivalent; Pentax 04 Toy Lens Wide (2011) — 35 mm equivalent; Pentax 05 Toy Lens Telephoto (2011) — 100 mm equivalent; Pentax 06 Telephoto Zoom (announced in 2012) — 83–249 mm equivalent; Pentax Adapter Q for K-Mount Lens (announced in 2012)
Although the term “digicam” originated as a syllabic abbreviation for “digital camera”, it is now used primarily to refer to an old compact digital camera or, in other words, a discontinued point-and-shoot camera with a fixed lens. [32] [33] [34] Digicams emphasize portability and ease of use, and they often include a built-in flash. [35]
In June 2013 Pentax announced the successors to the K-30, the K-50 and K-500. Both are mid-level DSLRs, the K-500 being a stripped-down version of the K-50, having no weather seals and less-advanced electronics. [36] [37] Pentax K-500 uses 4 AA batteries (rechargeable Lithium battery is optional), while Pentax K-50 uses rechargeable Lithium ...
It is also known as the Pentax SF-1 in the United States, and was first produced in 1987. It was Pentax's second Autofocus 35mm SLR after the Pentax ME F. It was the world's first AF SLR with built-in auto flash. The SF-X comes from the same family as the slightly newer Pentax SF7/SF10.
The first mass-produced autofocus camera was the Konica C35 AF, a simple point and shoot model released in 1977. The Polaroid SX-70 Sonar OneStep was the first autofocus single-lens reflex camera, released in 1978. The Pentax ME-F, which used focus sensors in the camera body coupled with a motorized lens, became the first autofocus 35 mm SLR in ...
The Cleveland open-cup method is one of three main methods in chemistry for determining the flash point of a petroleum product using a Cleveland open-cup apparatus, also known as a Cleveland open-cup tester. [1] First, the test cup of the apparatus (usually brass) is filled to a certain level with a portion of the product.