Optics used for photolithography requires the environmental durability against high temperature and high efficiency in transmission and reflection to contribute a production yield. We provide bandpass filters for mercury emission lines, longpass filters, or cold mirrors coated by ion assisted deposition (IAD) method.

What areoptical filtersused for

Longpass filters are commonly used to isolate regions of a broad spectrum. The role of this type of filter is to transmit energy over a specified band at wavelengths longer than the cut-on wavelength, and to block the transmittance of energy at wavelengths shorter than the cut-on wavelength. In addition, longpass filters are useful for custom bandpass filtering by using with shortpass filters. Asahi Spectra offers a wide variety of longpass filters in the broad wavelength range: ultraviolet, visible, or infrared wavelengths.

Neutral density filters are the reflective type of ND filters, which are used to control the light intensity. Coated chromel layer attenuates the light by mainly reflecting and partially absorbing. Our ND filters are designed to keep spectrally even performance especially in VIS range without altering the relative spectral distribution of the energy. Still they are available from UV through IR because the substrate material is fused silica. 6 kinds of attenuation rate are available.

Types ofoptical filters

We have provided astronomical filters, dichroic beam splitters, or windows with broadband AR to world's well-known observatories in Chile, Hawaii, Canary, and Arizona for over twenty years. Unlike cheap astronomical filters for amateurs sold online, Asahi astronomical filters are fabricated to meet many hard requirements for sciences from professional astronomers. We are always willing to challenge new technologies to cooperate with the unique instruments.

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The sensor size of the camera also plays a significant role in determining the field of view. A larger sensor size will provide a wider field of view for the same lens, capturing more of the scene.Conversely, a smaller sensor size will result in a narrower field of view. The crop factor, which is the ratio of the sensor size to a standard full-frame sensor, further impacts the FoV. A larger crop factor means a narrower FoV, effectively magnifying the image. Understanding how sensor size and crop factor affect your FoV can help you choose the right camera and lens combination for your camera hardware design project.

Super cold filters are heat-reflective type which have much better performance than a conventional heat-absorptive type. Even with a high power light source, the substrate will not be damaged because it is reflective type and made of fused silica. VIS transmitting type (750nm cutoff) and VIS-NIR transmitting type (1050nm cutoff) are available.

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The camera field of view (FoV) is a crucial concept in photography that determines the area visible to the camera lens. Measured in degrees, the FoV is influenced by both the lens focal length and the sensor size.

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Shortpass filters are commonly used to isolate regions of a broad spectrum. The role of this type of filter is to transmit energy over a specified band at wavelengths shorter than the cut-off wavelength, and to block the transmittance of energy at wavelengths longer than the cut-off wavelength. In addition, shortpass filters are useful for custom bandpass filtering by using with longpass filters. Asahi Spectra offers a wide variety of shortpass filters in the broad wavelength range: ultraviolet, visible, or infrared wavelengths.

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This calculator provides the camera's field of view based on an image sensor and a lens. The field of view of a camera is dependent upon the focal length of the lens, the image sensor size, the lens distortion, and the lens image circle. We also have a wide angle lens FoV calculator which provides the field of view for our lenses on your camera's sensor.

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Bandpass filters are commonly used to transmit a well-defined wavelength band of the spectrum while rejecting both the long and short wavelength sides of the transmission band. Our coating designs are based on multiple cavity resonators. Thus, our bandpass filters have very steep slopes and very high attenuation outside of the narrow pass 10nm band. Asahi Spectra offers a wide variety of bandpass filters in the broad wavelength range: ultraviolet, visible, or infrared wavelengths.

The lens focal length is a critical factor in determining the camera’s field of view. A shorter focal length, such as 2mm, provides a wider field of view, allowing you to capture expansive scenes. On the other hand, a longer focal length, like 50mm, offers a narrower field of view, which is perfect for zooming in on distant subjects. It’s important to note that the focal length of the lens is used to calculate the FoV. Changing the focal length of the lens will directly alter the FoV, even if the sensor size remains the same.

We launch to produce optical and NIR filters for the purpose of defense, security or sensing by using magnetron sputtering. The interference film coated by sputtering has excellent durability against the cryogenic, heat or humidity. Spectral performance is quite stable and reliable in a tough environment. Large size is available as well.

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Optical filtersPDF

1.) The effective focal length of the lens (EFL)The EFL of a lens is a first order optical parameter. It should not be confused with the Back Focal Length (BFL) or the Flange Focal Distance (FFD) which are mechanical parameters. 2.) The image sensor active area The image sensor active area is calculated by using the pixel size and the total number pixels in the resulting image/video. If the output image or video is cropped, the field of view will change. 3.) The relative illumination of a lens The relative illumination is the reduction of light transmitted through a lens, as a function of position in image space. The camera industry loosely uses the term “Image Circle” as the position in image space where relative illumination is ~50%. 4.) The distortion of a lens Lens distortion is an aberration that occurs in optical design. Distortion is common in wide angle and fisheye lenses, but can occur in normal field of view lenses. Distortion increases the Field of View of a lens by compressing the angular resolution.

Our UV filters are manufactured by hard coating, such as ion assisted deposition (IAD) and magnetron sputtering (MS). These coating methods achieve hard coating, excellent durability for environment (humidity, low or high temperature, thermal shock or vacuum) and stability of spectral performance.

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