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IDAS HEUIB-II:
a filter for enchanced H-alpha nebula observations with UV/near IR suppressiong function - especially removing red end spectrum interference.
      
Size
Suffix
Description
Availability

M48

S

M48mm P0.75mm, substrate thickness 2.5mm

Mid June, 23

M48

ST2

M48mm P0.75mm, substrate thickness 2.0mm

available

ST2
M52mm P0.75mm, substrate thickness 2.0mm
available
Di2
  drops in AD19.4 drop-in mount adapter
available
ZF
  for use with ZWO cams (fb 6.5mm) and also IDAS AD19.4 drop-in filter mount
available
CA
  for use inside the body mount of EOS APS-C DSLR cameras
available
M
  for use inside the body mount of EOS M DSLR cameras
available
DRE
  for Canon EF-EOSR drop-in mount adapter & Meike MK-EFTR-C (EF-R) & MK-EFTE-C (EF-E) drop-in mount adapters - New! Details at: IDAS DRE Filter
available
RP
  for use inside the body mount of EOS RP cameras
available
R
  for use inside the body mount of EOS R cameras
available
R5
  for use inside the body mount of EOS R5 cameras
available

 


Feature 1
The HEUIB-II is a UV/IR-cut filter enhanced for shooting H-alpha nebulae at 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 lower (field angle of 34 degrees or lower).
When the HEUIB-II is placed between the lens and camera:  (applies to IDASmio filters)
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 faster, it is possible to keep the incidence angle below 20 degrees where the maximum averaged incidence angle of the incoming 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..