IDAS DTD Dusk to Dawn H-a, OIII & NIR Filter - 2" Mounted
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IDAS Dusk-to-Dawn Filter Review
Popular astrophotographer Cody from AstroBlender reviewed the IDAS Dusk-to-Dawn filter:
IDAS DTD Dusk to Dawn: A new generation filter covering multiple objects including comets, galaxies, the Milky Way, and emission and reflection nebulae, by making use of the extra tranmission in the NIR region.
The IDAS DTD filter not only passes through the Ha and OIII regions in the same manner as of the IDAS NBZ, but also provides a pass band for comet ion tails in the visible spectrum range (400nm to 700nm, susceptible to light pollutions). This filter furthermore enhances the contrast of the continuous spectrum lights from comet dust tails, galaxies and the Milky Way by making use of the NIR region that is hardly interferenced by light pollutions. The DTD filter makes it possible to shoot more objects in the visible to NIR spectrum range at higher contrasts.
n.b. on halos
Optical filters such as IDAS GNB and DTD utilizing infrared tend to cause haloing in the NUV and NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (optical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.
Here is a rough estimation of the magnitude of haloing where the haloing maginute of NBZ (NBZex) is counted as 1:
- DTD + IMX294 sensor results in 7.9 times
- DTD + IMX585 sensor results in 23.7 times
Specifications:
- M48 x 0.75
- Filter thickness: 2.0mm (previous version # ID-48mmS was 2.5mm thick)
- Lightweight frame
Other Information
- Country of Manufacture: Japan
IDAS Dusk-to-Dawn Filter Review
Popular astrophotographer Cody from AstroBlender reviewed the IDAS Dusk-to-Dawn filter:
IDAS DTD Dusk to Dawn: A new generation filter covering multiple objects including comets, galaxies, the Milky Way, and emission and reflection nebulae, by making use of the extra tranmission in the NIR region.
The IDAS DTD filter not only passes through the Ha and OIII regions in the same manner as of the IDAS NBZ, but also provides a pass band for comet ion tails in the visible spectrum range (400nm to 700nm, susceptible to light pollutions). This filter furthermore enhances the contrast of the continuous spectrum lights from comet dust tails, galaxies and the Milky Way by making use of the NIR region that is hardly interferenced by light pollutions. The DTD filter makes it possible to shoot more objects in the visible to NIR spectrum range at higher contrasts.
n.b. on halos
Optical filters such as IDAS GNB and DTD utilizing infrared tend to cause haloing in the NUV and NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (optical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.
Here is a rough estimation of the magnitude of haloing where the haloing maginute of NBZ (NBZex) is counted as 1:
- DTD + IMX294 sensor results in 7.9 times
- DTD + IMX585 sensor results in 23.7 times
Specifications:
- M48 x 0.75
- Filter thickness: 2.0mm (previous version # ID-48mmS was 2.5mm thick)
- Lightweight frame
IDAS Dusk-to-Dawn Filter Review
Popular astrophotographer Cody from AstroBlender reviewed the IDAS Dusk-to-Dawn filter:
IDAS DTD Dusk to Dawn: A new generation filter covering multiple objects including comets, galaxies, the Milky Way, and emission and reflection nebulae, by making use of the extra tranmission in the NIR region.
The IDAS DTD filter not only passes through the Ha and OIII regions in the same manner as of the IDAS NBZ, but also provides a pass band for comet ion tails in the visible spectrum range (400nm to 700nm, susceptible to light pollutions). This filter furthermore enhances the contrast of the continuous spectrum lights from comet dust tails, galaxies and the Milky Way by making use of the NIR region that is hardly interferenced by light pollutions. The DTD filter makes it possible to shoot more objects in the visible to NIR spectrum range at higher contrasts.
n.b. on halos
Optical filters such as IDAS GNB and DTD utilizing infrared tend to cause haloing in the NUV and NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (optical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.
Here is a rough estimation of the magnitude of haloing where the haloing maginute of NBZ (NBZex) is counted as 1:
- DTD + IMX294 sensor results in 7.9 times
- DTD + IMX585 sensor results in 23.7 times
Specifications:
- M48 x 0.75
- Filter thickness: 2.0mm (previous version # ID-48mmS was 2.5mm thick)
- Lightweight frame
Other Information
- Country of Manufacture: Japan
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IDAS DTD Dusk to Dawn H-a, OIII & NIR Filter - 2" Mounted