I just wanted to share my experience using the inexpensive SVBONY CLS filter that I recently bought off amazon, I hope this quick review will help someone.
This is by no means a promotion of the filter, just my honest opinion.
I typically shoot from my backyard in a Bortle 8 zone and it has always been a challenge to collect the faint details of the DSO's. I have to take a lot of images and it is quite time consuming even though I don't even do anything when my setup is taking pictures.
So reading about light suppression filters, I thought it could be a good addition to my camera especially when shooting emission nebulae.
I didn't want to spend a lot of money on a CLS filter and decided to give the SVBONY CLS one a try.
I was actually surprised by the performance of that filter, it does a good job on filtering the city lights and bringing up the faint details of the nebulae. Of course this filter is not a good solution for shooting reflection nebulae and galaxies as it filters out some good light from those objects, so my plan is to use it only with Ha and OIII emission nebulae.
Here is the comparison of two images, both are taken with the following parameters: ES ED80 APO triplet, ISO1600, no filter: 60sec, with the filter: 120sec.