Normally when I image at f/6.3 I use a manual 1.25" filter wheel with Orion LRGB filters. This time I used a thread adapter on my f/6.3 T-Ring and attached my Hyperstar filter slider. That way I used the better 2" Baader filters with a larger aperture and better even illumination on the sensor. I think the colors came out better too.
M15 Globular Cluster in Pegasus
C14 @ f/6.3, ASI1600MM-c, Baader 2" RGB filters
75 subs Lum and 25 RGB @ 30 seconds each