IDAS NB3-PM:
PM stands for Passband Modification Neubla Booster NB3-PM filter for OIII and SII Optical Distance Worker ODW clear filter (used instead of NB2-PM/NB3-PM) to correct the optical distance.
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Intimacy | Base Filter | NBx-PM or ODW | Transfers |
*** |
LPS-D3 (NGS1) | NB2-PM | OIII, H-alpha, NiiI |
NB3-PM | OIII, SII | ||
ODW | same as LPS-D3 | ||
** |
LPS-D2 | NB2-PM | OIII, H-alpha, NII |
NB3-PM | OIII, SII | ||
ODW | same as LPS-D2 | ||
* | HEUIB-II | NB2-PM | OIII, H-alpha, NIII |
NB3-PM | OIII | ||
ODW | same as HEUIB-II | ||
* | LPS-D1 | NB2-PM | OIII, H-alpha, NII |
NB3-PM | OIII | ||
ODW | same as LPS-D1 | ||
* | NB1 | NB2-PM | OIII, H-alpha, NII |
NB3-PM | OIII | ||
ODW | same as NB1 | ||
The more the number of "*" is, the less ghosts will be likely borne between the two filters. |
Note 1 |
The 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 NB2-PM/NB3-PM 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. |
Note 2 | |
The NB2-PM/NB3-PM filters utilize 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. |
An example of Hubble Palette Shooting of M42 Nubula |
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Filters: IDAS NB2-PM & NB3-PM Camera: QHY5III178C color cam Telescope: ORION 30cm F4+TeleskopGPU Coma Collector Filter Work: IDAS NB2-PM 48mm + IR Block filter, IDAS NB3-PM 48mm + IR Block filter NB2-PM 3sec x 140 frames, NB3-PM 3sec x 350 frames Photo taken by: Mr. Masaaki Uto - Iwata City, Shizuoka, Japan NB2-PM image RGB-mapped: Rch->G image (H-alpha, NII), Bch + Gch->B image (OIII) NB3-PM image RGB-mapped: Rch->R image (SII), Bch + Gch = B image (OIII) |