Radian Telescopes 2" Triad Ultra Quad-Band Narrowband Filter
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Radian Telescopes 2" Triad Ultra Quad-Band Narrowband Filter
The Radian Triad filter has now been improved upon! With the Triad Ultra, you now have narrower band-passes, more light pollution reduction, higher contrast, better separation between H-beta and OIII channels, and sensitivity in the Sulfur II emission lines. Like the original Triad filter, the Triad Ultra is designed to work with color cameras but also as a narrow-band-luminance filter for monochrome cameras.
|Hydrogen-beta||Oxygen III||Hydrogen-alpha||Sulfur II|
|FWHM||5 nm||4 nm||4 nm||4 nm|
The Triad Ultra is 100% American made and uses advanced multi-coatings and extreme tolerance glass, to ensure it is always consistent and accurate. Filter thickness is 3 mm.
Below you'll see an incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra on the super-fast f/2 Celestron RASA telescope!
The Triad 2-inch filter is housed in a 7 mm tall ring, with 5 mm height above the threads. The ring wall thickness is between 1.3 and 2.58 mm - depending on production batch. Please double check to make sure this will fit your filter wheel or accessories.
- 2-Inch Triad Ultra Quad-Band Filter
- Filter case
I wasn't sure what to expect from this filter, I had been using a much cheaper Triband filter so was thinking 'how much better can it be?' The answer very quickly become, incredibly! For me this filter has 2 important advantages over triband filters available from many other brands, also available from radian. 1) Having 4 discrete narrowband passes allows for the create of genuine narrowband images, this is basically 3-4 high quality 5nm bandpass filters built in to one, the nebula isolation is incredible. Triband filters tend to have a decent Ha pass in the 7-12nm range but the O3 and Hb pass is usually 1 big pass in the range of 35nm or so. For me this causes a couple of issues. a) You get big stars, especially in your blue and green channels due to the larger pass, this makes post processing difficult as you get less contrast in blue and green as star light floods in. b) The broader bandpass in green and blue allows light pollution in which can also cause you greater issues in post. Also the red channel being a smaller pass lags behind significantly in exposure which again can make gauging exposure times and flat exposure times tricky. 2) Halo's, cheaper filters will give you filters, regardless of anti reflection coatings being claimed, browse Astrobin you'll see many a halo. The fact this filter gave me very few halo's was brilliant it just leaves you with a far cleaner final image and, for me, is the hallmark of a true top quality filter. For the reasons above I've found this filter a genuine pleasure to use, post processing is easier as the data produced by it is clean and naturally more balanced due to the narrow band passes that flow in to red green and blue channels of the sensor. OPT were kind enough to use some image that I took with the filter in the images above and I can say that they are some of the best images I've ever taken. I shoot in Bortle 7 so far from extremes of city centre 9's but still strong enough to struggle with RGB. This filter allows me to shoot any day of the week regardless of moon phase and generate excellent results. For these reasons I think this makes the filter good value for money as it actually increases the number of days that you can image.
This filter changed everything and now i don't have to travel to a dark sky to shoot all night but rather can keep my rig setup and ready in the backyard and just untarp it and shoot. The contrast and colors that just pop out with a stf autostretch are incredible. A great filter for brilliant photos and also for outreach. Only thing is i wish i had gotten this larger 52mm size vs the 2inch size so if i upgrade to fullframe chips it would cover without any vinette. The filter seems expensive but it is so worth it and will be your favorite piece of equipment! I have def got my money's worth out of it these 8 months. I get so much more integration time with this filter having my backyard rig that the images are 100x better than before. Im blown away at what it can do for a color camera. I shoot 10min exposures and it seems to work well.
I just retired and now want to engage in a lifelong ambition - astrophotography. Sebastian at OPT understood what I wanted and guided me in identifying the equipment that would best address my ambitions and grow with me as I grew in experience. OPTs expertise made it easy for me to assemble compatible components to put together a first class astrophotography system. I will continue to do business with OPT!
Due to free-time constraints and the lack of consistent clear skies, I only shoot with a one shot color CMOS camera. I also have light pollution to contend with from my location. This filter is the perfect solution for my situation. I have been producing excellent images. I have also seen excellent images others have produced using this filter even with a full moon in the sky. It is very expensive for one filter but the cost is not outrageous considering it is actually four filters-in-one.
It's difficult to overstate how significant an impact the Triad Ultra has had on my imaging. I'm not going to lie, it was not an easy purchase; it certainly isn't the cheapest filter out there, but I'm seeing results I would have NEVER been able to get without it. The results on emission nebula is nothing short of stunning, and it's all done without the time or complexity of shooting mono with multiple filters. I'm using it with an ASI294MC, and it's performance with my camera is flawless. The Veil nebula reveals extraordinary color and if far more prominent with far less total exposure time than without the filter. The Eagle Nebula, the North America Nebula, Pelican Nebula, Crescent Nebula, etc are all perfect targets, and will show exceptional detail, depth, and color. As a matter of fact, the data I get with this filter is so good that beyond calibration, stacking, basic color calibration and background extraction, I haven't had to manipulate the images at all. Once the basic routines are complete, I end up with finished products that I am very happy with. If I could give this filter more stars, I would. It's not cheap, but it's been one of my favorite AP purchases.
I used this filter with both the ZWO ASI071MC-P, and with the Starlight Xpress SX-814 Monochrome camera. With the 071, I was able to shoot through heavy light pollution (I had street lights right next to my setup) to test how well it worked in light pollution. The images came through of the Omega Nebula and I was extremely impressed with the details that I was able to get with it, especially through the street lights. The 2nd test was using it as a luminance filter for my narrowband shots with the monochrome SX-814 camera. The detail was again extremely impressive, but I have not been able to get a full narrowband data set as the weather has not cooperated. Looking forward to clear skies to finish getting Ha Sii Oii data to combine with the Triad filter as the L channel. So far, this filter is doing everything I expected and more.