When the formulas are applied, the scale of the observation system due to the large focus aperture Angle must be enlarged, or else the empirical formula will be invalid.

在实际应用中，由于聚焦孔径角加大，观测系统范围也必须相应加大，否则经验公式失效。

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The effect of some factors on the transmissivity of fiber optic image inverter is analyzed, and the relation of the transmissivity between radial position and aperture angle is given.

本文论述光纤倒像器中扭转光学纤维的形状和尺寸及其特别的传光性能。

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The main parameters that effect horizontal resolution of migration imaging were identified as medium velocity, dominant frequency of seismic wavelet and aperture Angle of migration processing.

结果表明，影响偏移成像水平分辨率的主要参数是介质速度、地震子波主频和偏移处理的孔径角。

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When set at maximum aperture and widest angle of view the photographer can use fast shutter speeds in dimly lit locations and take advantage of a beautiful bokeh (out-of-focus) effect in the background.

ENGADGET: Pentax launches brass-bodied MX-1 point-and-shoot: 12MP with 4X zoom (update: now with hands-on photos)

In addition to daily use as a "pan-focus" lens featuring a wide angle, fixed f8 aperture and shallow depth of field, it is compatible with manual focusing using a lever and capable of close-up shooting as close as 30 cm.

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)

Its newly designed, large-aperture, 4x optical zoom lens (with the maximum aperture of F2.0 at wide-angle end), high-sensitivity, back-illuminated 16 megapixel CMOS image sensor, and sensor-shift Shake Reduction system ensure sharp, high-quality, low-noise images.

ENGADGET: Pentax expands ruggedized series with Optio WG-3, Target-exclusive WG-10