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IDAS LPS-D1 Light Pollution Suppression Filter     Key Technologies UFO MBT IGAD
Sizes Available
M28.6 (31.7mm)
*EOS-MFA 37mm
Filter pre-installed inside the MFA
now available
now available
now available
*37mm refers to EOS-MFA 37mm. Its frame is slightly thinner than that of standard M37 frames, and has a slightly smaller OD.

-IDAS LPS-D1 is a general-purpose light pollution suppression filter designed to use with modified digital still cameras and cooled CCD's.
The LPS-D1 will reduce the interference from the red end spectrum associated with the LPS-P2 or its competitions, and enhances the wave length of H alpha nebulae.
-Note, however, that if your digital camera has been already equipped with the UIBAR-III, there will be no reduction in the red end spectrum interference even whether a LPS-P2 or LPS-D1 is used in combination with your camera.
-The LPS-D1 is best used with digital still cameras (DSC) equipped with UIBAR、UIBAR-II、SBAR、or other makers' clear filters, and DSC with a lowpass filter removed.
-For visual observation and conventional film shootings, the LPS-D1 can be used in the same manner as with the LPS-P2.

-The LPS-D1 light pollution suppression filter is a successor of the LPS-P2 utilizing IDAS's own technology called the MBT (Multi Band-pass Technology), and suppresses the emission lines of mercury and sodium lamps while maximizing transmission of lights from planets and stars.
- The MBT technology ultimately maximizing the transmission band, makes it possible to obtain images rich in colors with the light pollution sources ideally suppressed.
-The LPS-D1 has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and star clusters. The same holds true for visual star observations.

-The LPS-D1 is coated by the use of the IGAD (Ion-Gun Assist Deposition) which has been also adopted by the LPS-P2, LPS-V4 and BGR Type 4 filters.
-The IGAD technology densifies the thin multi-layer coat - the heart of the LPS filter, and has the following physical features that cannot be obtained with conventional multi-layer coating technologies:
1)  Highly durable thin layers of which hardness equals to quartz glasses. Tremendously improved adherence between the substrate and the multi-layers set.
2) Absolutely almost no aging variation in optical spectral characteristics due to temperature and humidity change as far as used in the regular human living environments.
*This product is an interference filter.  Its spectrum characteristics will be subject to the incidence of incoming light. Please carefully read the following instruction for proper use:
When the LPS-D1 is placed before the lens:
Use a lens having the light incidence angle of 17 degrees or less (field angle of 34 degrees or less).

When the LPS-D1 is placed between the lens and camera:  (applies to EOS-MFA 37mm and FF)
When your camera is equipped with an APS-C image sensor and uses a lens with a *back focal distance of 40mm or greater and F value of two or more, it is possible to keep the incidence angle below 20 degrees where the maximum averaged incidence angle of light ray against the filter can be held within about 17 degrees. Under the conditions of the above mentioned camera, there will be almost no field angle requirements for the lens to be used.
28mm F2.8 50mm F2.0 

*This is NOT the flange focal length.

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