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Longtime seller for more than 10 years after the first introduction of LPS-P1! Size Available Availability Remarks M28.6(31.7mm) in stock re-run M48mm in stock re-run M52mm in stock re-run For sizes larger than 52mm, you can please consider purchasing the LPS-D1. -The LPS-P2 light pollution suppression filter is a successor of the LPS-P1 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-P2 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-P2 keeps minimum the leakage of the near infrared region (about one tenth of the LPS-P1). The LPS-P2 alone can suppress infra red, and thus can be used at ease for "L" image shootings with CCDs. -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-P2 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-P2 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.