由于散光，对象出现拉伸和扭曲。
散光是由于角膜时，形状像一个足球不定期。
Astigmatism is caused when the cornea is shaped irregularly like a football.
取景器盖能防止由于离散光进入取景器目镜而引起不正确的曝光。它能保证测光系统完全不受影响。 收藏。
The viewfinder cap is used to avoid incorrect exposure due to stray light which may enter the metering system is not adversely affected.
这种单色仪由于波长精度高、重复性好、分辨率高而杂散光却很小，因此具有特殊用途。
As wavelength precision and resolution of the instrument is high, but the stray light is less, and the repeatability is good, it has special purpose.
这种单色仪由于波长精度高、重复性好、分辨率高而杂散光却很小，因此具有特殊用途。
As wavelength precision and resolution of the instrument is high, but the stray light is less, and the repeatability is good, it has special purpose.
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