棱柵（光柵+棱鏡）是一種光學棱鏡，在該棱鏡的某一（極少出現兩個）扁平（極少出現曲面）功能表面上加工有一塊透射光柵。棱柵有直接的視角或者說沒有波長偏移。這一特性使其能夠將相機轉變成攝譜儀，方法是在光路中插入棱柵。這一方式可運用至各種應用中，如天文學。通過相應地選擇棱鏡的刻槽密度和頂角，根據特定應用需求對棱柵的直視波長和角色散進行調整。
A Grism is a Prism That Has a Transmission Grating on One Of its Plane Surfaces. A Grism (GRating+prISM) is an optical prism which has a transmission grating fabricated onto one (rarely two) of its plane (rarely curved) functional surfaces. Grisms have a straight view or undeviated wavelength. This property allows them to transform a camera into a spectrograph by inserting the grism in the optical beam path. This can be used in various applications, e.g. astronomy. By selecting the groove density and the apex angle of the prism accordingly, the straight view wavelength and the angular dispersion of the grism can be adapted to the needs of the specific application
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