SVBONY

This filter is excellent for the price. The picture that I've attached was taken under bortle class 4 skies with an unmodified t5i. The filter helped me gather detail in the very faint nebulae details, and it did a decent job.

Perfecto para astrofotografía, ayuda a contrastar la imagen

I used the SVBONY 2-inch UHC filter for visual observation, and this is my first UHC filter. I was able to see the M94 galaxy, which I had never seen before against the bright sky background, with my 8-inch SCT. This filter makes the sky appear much darker while keeping most nebulae visible. I noticed significantly better contrast with the M17 Omega Nebula, though I feel that some fine details might have been filtered out and lost. I would not recommend it for visual observation of globular clusters like M3 and M5. The image was only slightly less sharp, and I thought I saw some reflections. The craftsmanship is excellent; the glass appears to be top quality and very clean. In my video, you can see that this filter gives an image with a slight violet tint. I can't compare it to a high-end UHC filter because I don't have one, but for its price, I think this filter is excellent. It will most definitely help you see faint deep-sky objects that you might have wondered if they were even there.

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.

I’ve only had a couple of sessions worth of imaging with this filter, but the results so far are great. I’m close to downtown in a major city and to a street light and I definitely notice a difference in picture quality with this filter. It’s great for nebulae and really brings out the reds. It’s not so good for galaxies and star clusters as far as I can tell. Just starting to really dabble in filters and this one was worth the buy.