IDAS HEUIB-II

Welcome to Optics Division of ICAS Enterprises!

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	discontinued
M48	ST2	M48mm P0.75mm, substrate thickness 2.0mm	available
M52	ST2	M52mm P0.75mm, substrate thickness 2.0mm	available
DS		for use with IDAS AD42-DS drop-in mount adapter - 1.1mm thickness - New! Details at: IDAS AD42-DS Mount Adapter	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
DZ		to use with the ZWO M54 Filter Drawer mount adapter (FD-M54-II). You can replace the ZWO holder with IDAS DZ filters. - New!　Details at: IDAS DZ framed Filter	available
DRT		for Canon EF-EOSR drop-in mount adapter & Meike MK-EFTR-C (EF-R) & MK-EFTE-C (EF-E) drop-in mount adapters as well as for Kolari EF-EOS R Drop-In Filter Mount Adapter For Canon And RED RF cameras.　 Details at: IDAS DRT framed Filter	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 - Details at: IDAS DRE Filter - replaced by DRT for now.	discontinued

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, thus, works to bring the reddish color balance of an UV/IR modified camera closer to the normal color balance.The HEUIB-II is the only UV/IR-cut astronomical filter that can obtain images with a good white balance even with the auto white balance setting.

Feature 3
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.

Landscape Astrophotography:
These days more and more people make use of IDAS DRE/DRT filters for landscape astrophotography. Here are the links to valuable reference sources to learn about landscape astrophoto graphy - provided by courtesies of Mr. Bernat Font.
- https://bernatfont.wixsite.com/mallorca-landscape/post/sistema-de-filtros-drop-in-filtros-idas
- https://www.sonyalphaforum.com/topic/21934-drop-in-filters-idas-filters-for-widefield-astrophoto/#comment-70164
- https://www.dpreview.com/forums/post/68239480

*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..