r inches. For a given film or sensor size, specified by the length of the diagonal, a lens may be classified as a:කැමරා  කාච: angle of view of the diagonal about 50° and a focal length approximately equal to the image diagonal.පුළුල් කෝණී කාච: angle of view wider than 60° and focal length shorter than normal.Long-focus lens: any lens with a focal length longer than the diagonal measure of the film or sensor.[1] Angle of view is narrower. The most common type of long-focus lens is the telephoto lens, a design that uses special optical configurations to make the lens shorter than its focal length.කාච වර්ග[සංස්කරණය]සමීප-රූප කාච හෙවත් මැක්රෝ කාච[සංස්කරණය]සූම කාච[සංස්කරණය]ප්‍රධාන ලිපිය: සූම කාචමූලාශ්‍ර[සංස්කරණය]↑ Sidney F. Ray, Applied photographic optics: lenses and optical systems for photography, page 294ආකාස කුසුම් Akasa Kusum (Flowers of the Sky)ගොනුව:143x200-images-stories-newstext-Art-Akasa Kusum finalposter.JPGMovie poster for Akasa Kusum (Flowers of the Sky)අධ්‍ය