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The structure of a PAD is defined by the ITU-T in recommendations X.3, X.28, and X.29. Sometimes, this is referred to as a Triple-X PAD, due to the three X-series recommendations which define it: X.3 specifies the parameters for terminal-handling functions such as line speed, flow control, character echo, et al. for a connection to an X.25 host.
Bokeh of a mirror lens, with ring pattern in out of focus areas. Several companies made catadioptric lenses throughout the later part of the 20th century. Nikon (under the Mirror- Nikkor and later Reflex- Nikkor names) and Canon both offered several designs, such as 500 mm 1:8 and 1000 mm 1:11.
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
Dotted lines show sizes of round mirrors that would have had equivalent light-gathering ability. The telescopes shown on this comparison chart are listed below, ordered in each sub-section by (effective) mirror/lens area, low to high, and then by actual/planned first light date, old to new. The "present-day" status is given as of the beginning ...
SF-25D Falke SF-25B converted with a Limbach 1700A engine. SF-25E Super Falke A SF-25CS with extended wing, a narrow-chord vertical tail. air brakes and a raised bubble canopy, first flown in 1974. SF-25K K-Falke A SF-25C with folding wings and large canopy. Slinsgby T61 Falke/Slingsby Venture Licence built variant of the SF-25B, 76 built
Each problem frame has its own frame diagram. A frame diagram looks essentially like a problem diagram, but instead of showing specific domains and requirements, it shows types of domains and types of requirements; domains have general, rather than specific, names; and rectangles representing domains are annotated to indicate the type (causal ...
Some clinics do not have 6-metre eye lanes available, and either a half-size chart subtending the same angles at 3 metres (9.8 ft), or a reversed chart projected and viewed by a mirror is used to achieve the correct sized letters. In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres.
The diagram shows the mirror system and the synchronized engine that displays light from the high speed video projector. Spinning mirror systems are used to build interactive 3D graphics and autostereoscopic visuals visible to multiple simultaneous viewers, since a different view can be perceived by each viewer depending on the angle of vision.