SVBONY Telescope Filter UHC Filter Ultra High Contrast Filter EOS-C Clip-on for CCD Cameras & DSLR Reduce Light Pollution

This broadband (50nm) UHC works well and has allowed me to view nebula (other than M42 / Orion Nebula) for the very first time from my light polluted backyard. I never thought I would be able to detect nebula from my backyard, where I do most of my visual observing using 8" and 10" F5 dobs. I'm in a red/white light pollution zone which is considered "Bortle 8" aka "can't see ****, captain". This filter hits well above its weight and is comparable to a more expensive Optolong UHC filter. Even with most of my city using LED street lights, whose light pollution is harder to filter out, this filter performed exceptionally and allowed me to detect nebulosity in Scorpius last night. The nebulosity was faint, but it was absolutely there. I didn't need to use averted vision or any other aids to detect it. With visual observing, you can't expect bright Hubble views albeit I suspect this filter would work exceptionally well for astrophotographers, who will be able to achieve great results with this filter + long exposures. The fact that I could visually detect any nebula at all that wasn't M42 in Orion makes this worth the measly $20 paid. Members of a popular astronomy forum have sent the SVbony UHC filters out to Lumicon- one of the top optics and filter labs- and it revealed that this filter is virtually identical in performance to Optolong UHC filter and may even be the same thing. The Optolong is well regarded and sells for $80; a $20 SVbony performing the same as a filter that is 4X as expensive is a great deal. The price and the performance of this makes it a must have filter if you don't have one. I'm not a fan of filters as I find the price:performance underwhelming for visual observing, but this filter hits all the right notes. I will likely buy SVbony's 2" version of this filter, I like its performance enough that I want it available for my 2" wide field EPs. I wish SVbony made an OIII; I'd buy it in a heartbeat if it performed as well as this UHC.

Good lens

ease of use, Hobt pops straight into my camera and the performance was pretty great in my opinion and it’s not that expensive

The virtue of high contrast filter (or city light filter) is to coat some relevant materials on very flat glass, selectively transmitting wavelength that suits the filter's purpose. So ideally speaking if you live in Bortle class 1 area, you don't need it. But there are only a few places you will find near your city even in the western side of the US. Therefore this filter can do the right job for you, for most cases. Indeed, non-flat glass and uneven coating will mar your filter and in the end, it mars the quality of an optical image projected on your eyepiece or the camera sensor. For that, perhaps very high-end quality astrophotography might want something more expensive filters. As an amateur, this filter is just perfect. You may lose some lights as filters wouldn't have 100% transmittance for necessary wavelengths. Despite such light loss, transmitting only the necessary wavelengths is important as your camera sensor doesn't want to be saturated by unnecessary wavelengths hitting your sensor. One of the best representative unnecessary wavelength shall be city light. Longer you expose through one shot of the picture, more importance of the filter you fill find. Attached is Trifid nebula,stacked many images taken 30 seconds for each.

I have a 4.5" (114mm) f/4 Zhumell Tabletop Dobsonian, that I've been using for several months. Last night we had clear skies, but 6" of snow cover reflecting all the Christmas lights back up into the sky--so the light pollution was substantial. However, since the moon was not out the seeing was pretty good, which made it a good time to test this little Svbony UHC filter! In relatable terms: the sky was dark enough to see the Pleiades and the Orion Nebula with the naked eye (the latter requiring judicious use of indirect peripheral vision)--but not clear enough to really make out the Milky Way. Despite the imperfect conditions, I was actually startled when I first focused on the Pleiades... Everything wasn't just shades of grey--I could see blue! I've been able to see red and yellow stars previously (you can even make out the difference with the naked eye) but the Pleiades just popped with blue! It was a memorable experience, and really quite moving. I won't forget it. The Orion Nebula was similarly stunning, the contrast was excellent and the color beautiful. ...Long story short, I spent an hour (possibly more) in the cold snow mesmerized by GOD's wonderful creation! Well Done SVBONY!

This is my second attempt at photographing the Orion Nebula (M42, "The Great Nebula In Orion"), and only the second deep sky photo I've ever taken. I'm happy with this. It is the result of 88 images stacked in Deep Sky Stacker, ranging from 1 second to 35 second exposures, ISO 3200. I used a few Dark Frames and Bias Frames, but no Flats, so I probably could have done better, and I would recommend ISO 1600 maximum. I used a Celestron Nexstar 6se on an Alt-Azimuth mount, 2-star alignment using Sirius and Polaris, f6.3 (Celestron Focal Reducer), approx. 1053 mm focal length, Canon T3i with SvBony UHC (light pollution) clip-in C-frame filter. I used a Bahtinov mask to confirm focus on Sirius prior to using "Bulb mode" on the camera with a cable release made by Apurture. Yes, I said Alt-az mount, no wedge, not polar aligned. With a wedge I could do 2 minute subs instead of the 30-second maximum I was boxed-in with. Seeing conditions were Bortle Class 6 with a street light directly in front of me, so think more like Bortle 7. Final image adjusted for levels, color correction, and contrast in Photoshop CS 2020. I'm blown away. Without this filter all I got was a yellow haze and a grainy image. I'm probably going to buy their CLS filter as well, even though the bandwidths are very similar. I also bought their 1.25 inch eyepiece UHC filter for visual astronomy. I'm sold on this company. Highly recommended.

Excelente, funciona de maravilla

It certainly made some difference, but with all of the LED lighting there is just no filter that can help.