Welcome to Optics Division of ICAS Enterprises!

         
IDAS NB1:
A dual band nebula booster filter for OSC shootings.

                               
Size
Suffix
Description
Availability

M48

S

M48mm P0.75mm, substrate thickness 2.5mm
available

M48

ST2

M48mm P0.75mm, substrate thickness 2.0mm
available
S
M52mm P0.75mm, substrate thickness 2.5mm
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 use with Meike MK-EFTE-C/MK-EFTR-C and Canon EF EOS R Drop-in Mount Adapters: substrate thk. = 2.0mm
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 NB1 is a thin-film interference filter that enables OSC cameras to shoot the H-beta, OIII, H-alpha and NII ranges of emission nebulae at a higher contrast rate.
The half value band pass width is about 32nm at the higher band, and about 20nm at the lower band, respectively.
Its transmittance range is intentionally shifted to the longer wave length side. allowing margins for "the shift tendency towards the shorter wave length side against oblique incidences" typically associated with thin-film interference filters.The NB1 can almost fully transfer the abovementioned nebular emission lines under the conditions , for example, where the incidence of the parallel flux is kept below 14 degrees, or a lens of the F value 2 or faster (or 1.4 or faster depending on lens) is used before this filter.

Feature 2
The LPS-D3 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 LPS-D3 is placed before the lens:
Use a lens having the light incidence angle of 14 degrees or lower (field angle of 34 degrees or lower).

When the LPS-D3 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 hold down the maximum averaged incidence angle of the incoming light ray against the filter within about 14 degrees. Under the conditions of the above mentioned camera, there will be almost no field angle requirements for the lens to be used.

* Please note, however, that the smaller the diameter of the rear lens element is, the more likely the maximum averaged incidence angle would exceed 14 degrees where the transmittance of nebula emmission lines could be deteriorated around the perpheral of the image.

28mm F2.8
50mm F2.0 

*This is NOT the flange focal length..