Construction began in 1889, based around a aperture lens that Howe purchased from Alvin Clarke & Sons.
2.
Mandler also designed lenses for IMAX movie projection systems, high-aperture lenses for HP scanners, etc.
3.
Simulations show that such aberration-free designs are applicable to high-numerical aperture lenses such as flat microscope objectives.
4.
Their very short focal length and small aperture lenses have enormous depth-of-field almost nothing is out of focus.
5.
Since wide aperture lenses are rare today, most contemporary photographers confuse bokeh with shallow depth-of-field, having never seen either.
6.
On the Four-Thirds mount, it is the only affordable normal, large aperture lens, therefore it is popular lens on that format.
7.
They also feature a 12-megapixel rear-facing camera with a " Dual Pixel " image sensor and f / 1.7 aperture lens.
8.
They became very popular among professional photographers, especially photojournalists who demanded high-performance, large-aperture lenses for available-light work and a workhorse.
9.
For a high numerical aperture lens, equivalent to a wide aperture, the depth of field is small ( shallow focus ) and gives good optical sectioning.
10.
The first common very wide aperture lens suitable for candid available light photography was the "'Ernemann Ernostar "'( Germany ) of 1923.
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