HOYA SHARP CUT PHOTOGRAPHIC FILTERS from Bes Optics, Inc. - Hoya sharp cut photographic filters include 21 types of filters and can be colorless, yellow, orange, and red.


Hoya Sharp Cut Photographic Filters

Hoya sharp cut photographic filters include 21 types, ranging from L-37 to R-72. The L, Y, O, and R symbols represent Colorless, Yellow, Orange, and Red tones of filter color respectively. The numerals used to classify the glass types indicates 1/10 the corresponding value of the transition wavelength. According to the Japanese Industrial Standard JIS B 7113 "Photographic Sharp-Cut Glass Filters", sharp cut filters are defined as "filters that cut off as much possible of the wavelength light shorter than a specific wavelength, while transmitting as much of the longer wavelength light as possible within a wavelength range of 350 nm to 800 nm."

Glass type

Transition wavelength

Use

Catalog thickness

L-37	370 nm	General photography	2.5 mm
L-38	380 nm	General photography	2.5 mm
L-39	390 nm	General photography	2.5 mm
L-40	400 nm	General photography	2.5 mm
L-42	420 nm	General photography	2.5 mm
Y-44	440 nm	General photography	2.5 mm
Y-46	460 nm	General photography	2.5 mm
Y-48	480 nm	General photography	2.5 mm
Y-50	500 nm	General photography	2.5 mm
Y-52	520 nm	General photography	2.5 mm
O-54	540 nm	General photography	2.5 mm
O-56	560 nm	General photography	2.5 mm
O-58	580 nm	General photography	2.5 mm
R-60	600 nm	General photography	2.5 mm
R-62	620 nm	General photography	2.5 mm
R-64	640 nm	General photography	2.5 mm
R-66	660 nm	General photography	2.5 mm
R-68	680 nm	General photography	2.5 mm
R-70	700 nm	Infrared systems	2.5 mm
R-72	720 nm	Infrared systems	2.5 mm

Below are approximate spectral curves for the above filters


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