Welcome to Optics Division of ICAS Enterprises!

         
IDAS NBZ-II:
The successor to the NBZ (NBZex) - a new dual band nubula booster filter that transfers:
OIII 8nm (+/-0.4nm)
H-alpha 10nm (+/- 0.4nm)
Test report to be provided with each filter piece. (Each filter is individually measured after production.)
Size
Suffix
Description
Availability
M48
ST2
M48mm P0.75mm, glass thickness = 2.0mm
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: NBZ-II DRE
Mid-Feb,'24

Di2

drops in AD19.4 drop-in mount adapter. Details at: Di2 Inst Manual
Mid-Feb, '24

 

The IDAS NBZ-II is a new dual band nebular booster filter - the successor to the NBZ (NBZex) filter. The FWHM of the NBZ-II is 8nm (+/=0.4nm) at OIII, and 10nm (+/-0.4nm) at H-alpha respectively. This has the same anti-Haloing characteristics as the NBZ did. For this product, we will provide a test report of the actually measured optical properties with each individual NBZ-II filter piece we ship.

Feature:
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 or narrower filters will decrease in transmittance by 50% or more when used in a fast optical system (around F2), while the NBZ=II retains 80% or more of the transmittance under the same conditions.

Gallery:
Click on each of the thumbnails so you can see a larger photo of each.

Thumnail Target Filter Camera Telescope Remarks Photo taken by:
NGC Planetary Nebula NBZ-II SVBONY SV705C Takahashi Epsilon 200 800mm F4 Astrograph Exp 3min x 116 frames, total exp 348 min Mru. Uto
NGC6888 Crescent Nebula NBZ-II SVBONY SV705C Takahashi Epsilon 200 800mm F4 Astrograph Exp 3 min x 30 frames, total exp 90 min Mr. Uto
Rosette Nebula NBZ-II ASI294MC Pro HD1100 HyperStar V4 530mm F1.9 Exp 60 secs x 15 Mr. Numasawa
Cone Nebula NBZ-II Asi294mc Pro HD1100 HyperStar V4 530mm F1.9 Exp 60 secs x 18 Mr. Numasawa
Horsehead Nebula NBZ-II Asi294mc Pro HD1100 HyperStar V4 530mm F1.9 Exp 60 secs x 25 Mr. Numasawa
Soul Nebula NBZ-II Asi294mc Pro HD1100 HyperStar V4 530mm F1.9 Exp 60 secs x 60 Mr. Numasawa
Lobster Claw Nebula NBZ-II Asi294mc Pro HD1100 HyperStar V4 530mm F1.9 Exp 60 secs x 50 Mr. Numasawa

Simulations:

The shift tendency will be stronger in optical systems that have a central obstruction. Taking this into consideration, we have designed the NBZ-II as you can see from the following simulations: