Parallel rays and sunlight are therefore transmitted differently by a solar concentrator and the corresponding transmission curves are also different.
2.
This dependence can be used to find specific transmission curves for different applications, where the geometry of the prisms serves as the input variable.
3.
Photographic filters do not need the accurately controlled optical properties and precisely defined transmission curves of filters designed for scientific work, and sell in larger quantities at correspondingly lower prices than many laboratory filters.
4.
Optical filters are used in various areas of science, including in particular astronomy; they are essentially the same as photographic filters, but in practice often need far more accurately controlled optical properties and precisely defined transmission curves than filters exclusively for photographic use.
5.
Many manufacturers make filters labeled as 81B with transmission curves which are similar, but not identical, to the Kodak Wratten 81B . This is according to that manufacturer's idea of how best to warm a scene, and depending on their manufacturing techniques.
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