Filter wheel with OSC Generic equipment discussions · Thomas Rider · ... · 13 · 461 · 4

Thomas_Rider_Astro 0.00
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I ordered a 5x2” ZWO filterwheel for my OSC 2600mc. Currently I have a Antlia Ha/Oiii filter and Askar D2 Sii/Oiii filter. I was curious if there is another filter I should buy to put in the wheel. I really didnt trust the filter drawer and wanted the ability to go between broadband and another filter easier between multiple target nights.

I was hoping there was a filter that was good for galaxies to allow in more broadband but blocked out some light pollution too.

any ideas would be appreciated
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Starman609 6.65
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IDAS just came out with a new DTD (Dusk To Dawn) filter that is geared towards Galaxies and Comets. It comes in 2" size.
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daveshow07 3.15
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I've found the Antlia Tri-Band filter is great for broadband targets like galaxies and does help with enhancing signal and LP suppression from my bortle 5-7 zone.

I've thought about doing the same thing, getting a 5x2 efw, then putting in my ALP-T Dual Band, triband, UV/IR cut, and a darks filter. I could probably add a dual band Sii filter (like you have with the askar) to complete the 5 slots and cover all my bases. I'm sure others have done something similar!
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Thomas_Rider_Astro 0.00
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Eddie Bagwell:
IDAS just came out with a new DTD (Dusk To Dawn) filter that is geared towards Galaxies and Comets. It comes in 2" size.

I have not heard of this I will check it out!
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Thomas_Rider_Astro 0.00
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David Foust:
I've found the Antlia Tri-Band filter is great for broadband targets like galaxies and does help with enhancing signal and LP suppression from my bortle 5-7 zone.

I've thought about doing the same thing, getting a 5x2 efw, then putting in my ALP-T Dual Band, triband, UV/IR cut, and a darks filter. I could probably add a dual band Sii filter (like you have with the askar) to complete the 5 slots and cover all my bases. I'm sure others have done something similar!

I highly recommend the Askar D2 its working great. I am googling the triband thank you
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JimCase 0.00
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I use the D2, Alp-T HA/OIII, UV/IR, TriBand, and L-PRO in my OSC filter wheel, with my ASI2600mc, and find the L-Pro does a decent job with galaxies in my Bortle 7 suburban sky.
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BFR 0.00
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Here I share a review I did of the IDAS DTD, with a small comparison to the Idas GNB for wide angle astro.


Idas DTD

The IDAS DTD (Dual Band Type D) is a filter that, although primarily designed to capture emission nebulae with color cameras under light-polluted skies, has proven to be surprisingly effective in landscape astrophotography for capturing the Milky Way as well.

Unlike other more restrictive dual-band filters (such as the Idas NBZ-II, the Optolong L-eXtreme, or others), the DTD allows a certain amount of starlight and galactic background light outside its central bands (Ha and OIII), resulting in a more colorful image where not only the typical bluish-green areas of oxygen or the reddish areas of hydrogen alpha are highlighted, but also golden and yellowish tones emerge in the central regions of the galaxy. This warm hue—unusual for a dual-band filter—makes it especially attractive for those seeking single-shot compositions without the need to mix with additional RGB exposures. In short, it is not a "pure dual band" in the strictest sense, and that works in favor of the landscape photographer, as it allows capturing not only emission but also the color and texture of the stellar environment, maintaining a very natural chromatic profile within its category. As is usual with Idas filters, the DTD performs very well with fast wide-angle optics (f/1.4 to f/2.8), which is essential in night landscape photography. Unlike other filters designed for telescopes, the DTD does not significantly shift the passbands or introduce strange halos, making it a perfectly valid option for use with quality photographic lenses and, if desired, also with longer focal length lenses.

dtd vs rgb.jpg
Comparison between an RGB (11mm, f2.8, 30 seconds, iso 1200) shot and a DTD shot (11mm, f2.8, 120 seconds, iso 2000), with WB correction.


Idas DTD vs Idas GNB

Both the IDAS DTD and the GNB are designed to enhance astrophotography with color cameras in light-polluted environments, but their approaches are very different, and this is especially reflected in the type of final image obtained, both in detail and in chromatic richness.

The IDAS GNB is a multi-band filter designed to moderately suppress light pollution. It is primarily focused on the Ha and OIII lines, although it allows some information from other bands to pass through. As for the DTD, it captures much more information and does not completely eliminate the areas between bands, allowing additional nuances to seep through. The result is equally contrasted images (not as much as those obtained with the GNB), but rich in colors, where warm tones (yellows, golds) appear in the central region of the Milky Way, in addition to the classic blues and greens of the nebulae, and the reds of the Hydrogen alpha. This combination provides a very attractive and powerful aesthetic, even without the need to combine with RGB shots.

In Milky Way photography, this translates into a clear difference:

- With the GNB, a bicolor image is obtained, in which the areas with H-alpha stand out. That can be very useful for, for example, photographing the winter track, where there isn't much color variation when shooting with wide-angle lenses, but not for the summer track, as it has a lot of other colors.

- With the DTD, a more expressive and colorful image is achieved, with approximately 1.5 more stops of light, and it often does not require complex post-processing or combination with RGB shots. Therefore, it is a more suitable filter for capturing the summer Milky Way if we don't want to combine filtered photos with RGB photos.

DTD VS GNB.jpg

Comparison between the capture graphs of the Idas GNB and the Idas DTD, and between the capture of information from the Milky Way between the two filters. Parameters of the Milky Way photographs: 11mm, f2.8, 120 seconds, iso 2000 for the DTD photo, and 11mm, f2.8, 120 seconds, iso 2000 (+ one and a half stop exposure compensation to match the DTD shot) for the GNB photo. Both ewith WB correction.




Conclusions

The IDAS DTD filter stands out as a versatile and effective option for landscape astrophotography, especially in capturing the Milky Way under light-polluted skies. Unlike other more restrictive filters, it allows for greater starlight entry and a richer, more natural color reproduction. Its design makes it ideal for single shots without the need to combine with RGB images. Compared to the IDAS GNB, it offers a warmer and more expressive aesthetic, ideal for the summer Milky Way.

bf-dtd-dre.jpgDSC08498_1 Panorama.jpg
Panoramas taken at 11mm, f2.8, 120 seconds, iso 2000, with the DTD filter
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dunk 1.81
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Panoramas taken at 11mm, f2.8, 120 seconds, iso 2000, with the DTD filter


Beautiful!
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TareqPhoto 2.94
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Yes, beautiful images, but i am more into deep space galaxies than a landscape wide field milky way, i will use telescopes large ones with color camera, and i live under Bortle 8/9 so heavy light pollution, i only have one dual band filter that i never tested yet and a light pollution filter which is IDAS D2 and i don't like it, it cut a lot of color band, it is like killing most of blue and some of green and keep most of red, so i have to do heavy processing trying to show all or most colors if i can, sometimes i feel it is better to have some of LP in the data and process it than killing it mostly so killing a wavelength or color bandwidth with it too, and just in future if i can drive to less LP so i prefer a filter that has minimal LP suppression than heavy one.
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Gondola 8.11
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Have you tried no filter? You might be surprised at how effective that can be.
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Deege7 0.00
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That DTD filter looks pretty cool! I hadn't seen that yet either but am going to check it out now. I have the same filter wheel. I put the IDAS NBZ, IDAS HeUB (HA enhanced UV-IR), IDAS LPS D2 light pollution filter, Radian Ultra Quad Band, and then no filter in the 5th spot. The HeUB filter really has been an amazing filter for broadband objects and Galaxies with Hydrogen Alpha wavelengths. It quickly became one of my favorite filters along with the NBZ for narrowband, just about all I use anymore between those 2 filters with color astrophotography. 

Amazing shots with the dawn to dusk filter!
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TareqPhoto 2.94
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Tony Gondola:
Have you tried no filter? You might be surprised at how effective that can be.

This question is to whom?
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Gondola 8.11
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Tareq Abdulla:
Tony Gondola:
Have you tried no filter? You might be surprised at how effective that can be.

This question is to whom?

The OP
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TareqPhoto 2.94
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Tony Gondola:
Tareq Abdulla:
Tony Gondola:
Have you tried no filter? You might be surprised at how effective that can be.

This question is to whom?

The OP

Ah ok
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