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IDAS HEUIB-II  H-alpha enhancement/UV-IR suppression Filter     Key Technologies UFO IGAD

Sizes Available
Availability
Remarks
37mm* running out of stock soon  
MFA now on sale!  
M48mm now on sale  
M52mm now on sale  
FF**    
*37mm refers to EOS-MFA 37mm. Its frame is slightly thinner than that of standard M37 frames, and has a slightly smaller OD.

Feature 1
The HEUIB-II is a UV/IR-cut filter enhanced for shooting H-alpha nebulaeat wave length of 656.3nm.
This will reduce the interference from the red end spectrum associated with regular astronomical IR-cut filters such as UIBAR-III, and as a result enhance the wave length of H-alpha nebulae. Even in comparison with our conventional HEUIB filter, HEUIB-II has less interference from the red end spectrum as a result of the increase in the red spectrum suppression range. Thus, the image of nebulae at the H-alpha region will get enhanced.

Feature 2
The HEUIB-II filter utilizes the IGAD (ion-Gun AssistDeposition) coating technology which has been applied to our regular LPS-P2 and LPS-V4 series. The IGAD technology densifies the multi-layers - the heart of interference filters - resulting in the physical properties that cannot be obtained from the conventional multi-layers.
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 HEUIB-II 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 HEUIB-II 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..

Key　Technologies



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