Difference between UHC and UHC-S?

[danielbd100]

Hi everyone i was going to buy a UHC filter for my Celestron nexstar 6 se when i found out about the UHC-S. Difference?

Thanks Dan

[John]

The UHC-S is a Baader filter that has a wider band pass width than a "Normal" UHC filter. It was designed to be useful with smaller aperture scopes where too much "blocking" leads to excessive dimming of the images. In a 6" scope though I think a conventional UHC would be pretty effective.