查询词典 Fresnel lens

This paper presented an optical system of star sensor. The lens system was a complicated double- Gauss configuration which had an effective focal length of 51 mm, an F-number of F/1.1, a field of view of 21°×21°(2ω=30°),and a working wavelength rang of 0.5~0.85 μm.

介绍了一种用于卫星姿态控制的星敏感器光学系统，该光学系统焦距为51 mm，相对孔径为1/1.1，视场角为21°×21°（圆视场2ω＝30°），光谱范围为0.5～0.85 μm，采用了复杂化双高斯结构。

Use zoom-in function in live-view mode while the lens has been stopped down to the designated f-stop.

当使用特定的镜头光圈值时，在实时取景拍摄时，使用放大功能对焦。

Since I do a lot of "general use" I have no complaints aside from the wishful thinking of a magic lens adapter that reduces to image circle to my *Ist while improving the F-stop an giving it the same angle of view of the 24-90 on 35mm.

因为我只是做一般用途，我没什么其他的抱怨，除了想要一个镜头转接环，用来减小它的成像圈，这样当我改进了F-stop 后在我的*ist上能得到和24-90mm一样的视角。

Closing the shutter reduces the exposure, allowing high-speed film to be used outdoors or allowing the lens to be opened to decrease depth of field or shooting at a selected f-stop.

关掉快门会减少曝光，这样可以用与户外高速摄影或用于打开镜头减少景深或用于有选择的设。

Adopt imported reflect mirror and lens from America, makes the facula thinner and the cut stronger.

采用美国进口反射镜和透镜，光斑更细、切割力更强。

Adopt imported reflect mirror and lens from America makes the facula thinner and the cut stronger.

四、采用美国进口反射镜和透镜，光斑更细、切割力更强。

Such as false tooth, false hair, contact lens, earring, ring, watch and etc.

比如：假牙，假发，隐形眼镜，耳环，戒指，手表等物。

Such as false tooth,false hair,contact lens,earring,ring,watch and etc.

比如假牙、假发、隐形眼镜、耳环、戒指等物。

The patient takes lens of groovy stomach bowel to check a position, clean oral cavity, the person that have false tooth gets off mobile false tooth, establish vein infusion channel.

患者取常规胃肠镜检查体位，清洁口腔，有义齿者取下活动义齿，建立静脉输液通道。

Ferrochromium soldering :power keep no more than 40W,tip temperature should not pass 280 oC,soldering time within 3 second, welding position and lens should keep 1.6mm distance at least

铬铁焊接时铬铁功率不要超过40W，尖端温度不要超过280 oC，焊接时间不要超过3秒，焊接位置最少与胶体保持1.6mm距离。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网