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IDAS LPS-V4 Narrow-band pass filter for nebulae observations     Key Technologies UFO MBT IGAD
Sizes Available Availability Remarks
M28.6(31.7mm) available  
37mm* available EOS-MFA 37mm
MFA now available - New! Filter already installed inside the MFA
M48mm available  
M52mm available  
*37mm refers to EOS-MFA 37mm. Its frame is slightly thinner than that of standard M37 frames, and has a slightly smaller OD.

-The LPS-V4 utilizes the IDAS's own technology called MBT (Multi Band-pass Technology), and is a high performance, semi-narrow-band pass filter intended for for nebulae observations.
-The LPS-V4 has succeeded the most of the visible spectrum characteristics of its predecessor LPS-V3, and further enhanced the suppression of the IR region. LPS-V4's IR suppression characteristics are almost on par with UIBAR-III's.
-When used in combination with either R-60 or R-64, the LPS-V4 can be used as an H-alpha band pass filter having a half-value bandwidth of 20 to 25nm.

LPS-V4 Features:
The conventional narrow-band nebula filters have been designed in taking into consideration, O-III and H-beta factors only. The LPS-V4, however, is designed with somewhat a little wider bandwidth in order to pass C2 coma, H-alpha and N-II as much as possible.
With the use of the LPS-V4 in combination regardless with cooled CCD's, DSLR's, silver salt film cameras or naked-eye observations, you can shoot and observe blue-green coma of planetary nebulae, diffuse emission nebulae and comets at a high contrast.

*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-V4 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-V4 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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