I own a 1.25" Bintel UHC filter and a set of coloured planetary filters. All I can say is they seem to be good. I do not have another to compare it with but the UHC ghas made a hell of a difference when it come to observations. I have learnt since purchasing my UHC that this alone is not quite enough but probably the best one to start with. The next filter purchase will be OIII as they allow different wavelengths to pass or to be filtered. Apparently one will never really be enough. Planetary, Relection, Bright Emmission (etc,) Neb's require swapping filters back and forth accordingly. I am happy with this filter however. Instead of simple grey blurs the wonders of the Carina Neb' or the Orion Neb' details hit me like a ton of bricks
. Don't go overboard and think that it will give you the imahges you see in books as one person I know thought she would get. If you buy it I don't think you will be disappointed however. StevenA