Standard NB filters to f2 - effects?

[fwm891]

I've just ordered a RASA 8 f2 astrograph which I see needs matching f2 Baader NB filters. Anyone know what the effect on the band pass is using standard NB (7nm) NB filters have? Baader don't want you to know what the band pass is with their f2 filters.

[andrew s]

The band pass shifts with the angle of incidence which increases with faster optics. If the band is too narrow then the desired wavelength can be sifted off the peak in filters transmission.  You need a wide enough band pass to ensure you get desired wavelength in the peak of the filters transmission. 

Regards Andrew 

[Adam J]

1 hour ago, fwm891 said:

I've just ordered a RASA 8 f2 astrograph which I see needs matching f2 Baader NB filters. Anyone know what the effect on the band pass is using standard NB (7nm) NB filters have? Baader don't want you to know what the band pass is with their f2 filters.

It wont not work but you will likely loose some optical efficiency hence you will not have the full benefits of F2, which is not to say you wont still have a very fast system. 

[fwm891]

Perhaps for Christmas (next year!)