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IDAS NBZex:
a dual band nubula booster filter that transfers OIII and H-alpha emission lines - the band width of each band is ca. 12nm (+/- 0.4nm). Functions in the same manner as NBZ/NBZ UHS except that IDAS NBZex supports from F1.8 to infinity.

The NBZex has been discontinued by now. We would recommend the NBZ-II for a possible replacement.

 

Suffix
Brand
Description
Availability
M48
IDAS
M48mm P0.75mm - supports from F1.8 to infinity
discontinued

 

The IDAS NBZex is a dual band nebular booster filter that transfers OIII and H-alpha emission lines with the band width of 12nm (+/-0.4nm) at each band. Halos that occurred around the ojbects with the predecesor "NBX" filter can now be decreased 1/100th thanks to the technology we have developed to surpress the repetitive reflections of the filter itself..

Feature 1
You may have already noticed that the half value band width (12nm) of the NBZex is a little wider than that of competitive narrow band filters claiming the half value band width of 7nm. It should be noted, however, that this wider band width has a great advantage.
The transmittance curve of interference filters will naturally shift towards the shorter wave length side against oblique light incidence, and this tendency will be more noticeable as the inncidence angle becomes higher as shown in the following figure.
Some of the competitive 7nm filters will decrease in transmittance by 50% or more when used after the fast optical system (around F2), while the NBZex retains 80% or more of the transmittance under the same conditions. This means that you can shorten the exposure time to 2/3 to a half (and moreover you can gain the same or better contrast) with the use of the NBZex when compared with the competitive 7nm filters.



Feature 2
The NBZex 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.