Ha line and UHC filters

[Vegeta (Ibrahim)]

Hi
I recently bought a UHC filter for visual observation; and noticed that it also transmits the H-alpha line as well as the H-beta and the 2 OIII lines. Will the transmission of the H-alpha make a difference as opposed to no H-alpha as far as visual goes, and will this affect the contrast?

Thanks in advance

[cometcatcher (Kevin)]

Originally Posted by Vegeta

Will the transmission of the H-alpha make a difference as opposed to no H-alpha as far as visual goes, and will this affect the contrast?

The eye is not very sensitive to Ha. All you will see from the filter are the blue/green OIII and Hb emissions. The Ha will be dominant on photos however.

[Vegeta (Ibrahim)]

Interesting; makes sense now, thanks for the reply!