Using 7nm dual-band Ha/OIII filters on fast f/3.8 systems

Hi all,

Quick question: has anyone used ~7nm dual-band filters (Ha/OIII) on fast systems (f/3.8)?

I’m just checking if that could work with Askar 50P.

• Does bandpass shift become a problem?

• Is 7nm still usable, or should I look at high-speed filters?

Thanks! Clear Skies!