Hi. I’m just wondering which filter thickness to get between Baader High Speed 6.5mm or 3.5mm Narrow Band CMOS Optimised. Set up will be the Rasa 8 and Zwo 294mm pro camera. I know the 3.5mn are more expensive but I just want the best for this setup. The guy from the astro shop recommended the 6.5mm but it looks like most people are using the 3.5mm with the Rasa. Thanks in advance