Welcome to Optics Division of ICAS Enterprises!

　　　　　　　　　
IDASmio　LPS-P3:
An ultra multi-band light pollution suppression filter after 20 years from the introudction of the first one, the LPS-P1 - suppresses night glow and mercury lamp sources
　 　　　　 　　　　　　　　 　　　
Suffix
Brand
Description
Availability
CA
IDASmio
 for use inside the body mount of EOS APS-C DSLR cameras
Yes
M
IDASmio
 for ue inside the body mount of EOS M DSLR cameras
Yes
DR
IDASmio
 for use with EF EOS R Drop-in Mount Adapters: substrate thk. = 2.0mm
Yes
RR25
IDASmio
 for use with EF EOS R Drop-in Mount Adapters: substrate thk. = 2.5mm
Yes
RP
IDASmio
 for use inside the body mount of EOS RP cameras
Yes
R
IDASmio
 for use inside the body mount of EOS R cameras
Yes
R5
IDASmio
 for use inside the body mount of EOS R5 cameras
Yes

 

Feature 1 - light pollution suppression chracterstics
The LPS-P3 is the world-first filter that suppresses both man-made and night glow interferences to the green and orange ranges.
Night Glow: OI (557.7nm)、 NaI (589.0nm、589.6nm), and also suppresses mercury lamp sources (g and e lines).

Night glow interferenced image (photo taken by Mr. Shigemi Numasawa):


Image ideally processed to reproduce the LPS-P3:effect


Feature 2 - intended objects to be taken
The LPS-P3 is designed based on the same concept as of other IDAS LPS filters so that it maxmizes the transfer of the light emissions from various emission nebulae and C2 comae of comet heads as well as coninuous spectrum emissions from galaxies and nebulae. 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 LPS-P3 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 3 - physical properties
The LPS-P3 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-P3 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-P3 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 emission lines could be deteriorated around the perpheral of the image.

28mm F2.8
50mm F2.0　

*This is NOT the flange focal length..