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Base curve radius (BCR) or simply base curve (BC) is the measure of an important parameter of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (BCOR). Typical values for a contact ...
The Olympus E-400 is a digital single-lens reflex camera launched by Olympus on 14 September 2006, using the Four Thirds System lens mount standard. [1] This 10 megapixel camera could be compared to other DSLRs unveiled during the summer of 2006 with comparable pixel count and price range: the Sony α 100, the Nikon D80, the Canon EOS 400D and the Pentax K10D.
Base curve: BOZD Back optic zone diameter BOZR Back optic zone radius BVP Back vertex power CLAPC/CLIPC Contact-lens-associated/induced papillary conjunctivitis CLARE Contact-lens-associated red eye CLPU Contact-lens-associated peripheral ulcer Dk Unit of permeability DW Daily wear EW Extended wear FOZD Front optic zone diameter FVP
A-TTL, first seen on the T90 (which predates the EOS family), is a flash exposure system that adds a brief preflash during exposure metering when the camera is in the programmed exposure (P) mode. [1] The amount of light returned from this preflash is used to determine an appropriate tradeoff between aperture and shutter speed in P mode.
14.6 K mount: 100 77 11 100 6400 5.2 3 yes yes SD: 131x97x73 750 May 2009: Pentax: K-50: APS-C: 16.3 K mount: 100 77 11 100 5120 6 3 yes yes SDXC: 130x97x71 650 June 2013: Pentax: K-500: APS-C: 16.3 K mount: 100 77 11 100 51200 6 3 yes yes SDXC: 130x97x71 646 June 2013: Pentax: K-30: APS-C: 16.3 K mount: 100 77 11 100 25600 6 3 yes yes SDXC ...
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