constant aperture造句

• In 1956, Ang閚ieux designed a constant aperture 17-68mm zoom lens, and a 12-120mm in 1958.
• High-end lenses will have a constant aperture, such as 2.8 or 4, which means that the relative aperture will stay the same throughout the zoom range.
• Unlike newer L-series lenses, it is not a constant aperture lens; the maximum aperture of this lens varied with the zoom ( f / 2.8 @ 28 mm, f / 4.0 @ 80 mm ).
• :I don't think the pupil changes size, I have a 70-210mm f / 4-5.6 ( NOT constant aperture ) and if I set it on say f / 11 at 70mm ( supposed pupil size = 6.4mm ), the aperture size doesn't change as I zoom, finally becoming f / 16 at 210mm ( supposed pupil size = 13mm ), but it still doesn't solve why the effective aperture changes when the pupil size doesn't .-- G 07 : 04, 22 November 2007 ( UTC)
• As of 2014, bridge cameras come in two principal classes in terms of sensor size, firstly the more traditional 1 / 2.3 " sensor ( as measured by image sensor format ) which gives more flexibility in lens design and allows for handholdable zoom from 20 to 24mm ( 35mm equivalent ) wide angle all the way up to over 1000 mm supertele, and secondly a 1 " sensor that allows better image quality particularly in low light ( higher ISO ) but puts greater constraints on lens design, resulting in zoom lenses that stop at 200mm ( constant aperture, e . g.