_Spirit_

All my filters are 2''. No wheel - just this 

https://www.teleskop-express.de/shop/product_info.php/info/p10475_TS-Optics-M48-Filter-Changer---strengthened-Design.html

Sometimes i use filter directly on GPU coma corrector with TS Newton 150/600.  Here o3 baader 8,5nm in this configuration - no flat:

3 minutes ago, carastro said:

Antlia

I am very happy with this filter. A big difference to Baader OIII 8,5nm.

IC 1396 

Baader Ha F2 - 60x300s + 60x120s

Antlia 3nm OIII - 29x300s (09-04-2021)

H6 F 2,8 + ASI 294

Capital city Warsaw Poland Bortlea 8-9