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The flat surface or "carrier lens" has little or no power and is there merely to fill up the rest of the eyeglass frame and to hold or "carry" the lenticular portion of the lens. This portion is typically 40 mm (1.6 in) in diameter but may be smaller, as little as 20 mm (0.79 in), in sufficiently high powers.
The standard lens was the 80mm f/2.8 C or the 80mm f/1.9 C. [5] The M645J was manufactured from 1979 to 1982. This was a stripped-down version of the M645, with the mirror lockup knob and second shutter button removed. The standard lens was the 80mm f/2.8 C or the 80mm f/1.9 C. [2]
Red-tinted lenses were considered effective in reducing internecine pecking because they disguise the color of blood. [7] As summed up in a 1953 article in Indiana's National Road Traveler newspaper, "The deep rose-colored plastic lenses make it impossible for the cannibal [chicken] to see blood on the other chickens, although permitting it to see the grain on the ground."
The position of the lenses A and B are known, and the angle of the lenses α and/or β is set by the operator so that both are aimed at the target. Because the distance between A and B on a coincidence rangefinder is typically fixed, once the angle is set correctly the operator need only read the range from the scale.
Original bifocals were designed with the most convex lenses (for close viewing) in the lower half of the frame and the least convex lenses on the upper. Up until the beginning of the 20th century two separate lenses were cut in half and combined in the rim of the frame.
The Best Actress award has been presented 96 times, to 79 actresses. The first winner was Janet Gaynor for her roles in 7th Heaven , Street Angel , and Sunrise: A Song of Two Humans . The most recent winner is Emma Stone for her role in Poor Things (2023); she had previously won the award for her role in La La Land (2016).
The Times called it "one of the six best books to help understand Trump's win", [47] and The Washington Post called Vance the "voice of the Rust Belt". [48] In The New Republic , Sarah Jones criticized Vance as "liberal media's favorite white trash –splainer" and a "false prophet of blue America ", calling the book "little more than a list of ...
The acronym "smc" stands for super multi-coated, a feature long found on higher-grade Pentax lens. "IF" indicates that the lenses are of an internal focusing design. Pentax 67 lenses can be used on the 645 series with an adapter. The Pentax 645 lens mount has a flange focal distance of 70.87mm. [7] [8] smc PENTAX-D FA 645 25 mm F4.0 AL SDM AW ...