Yeah, I am a fan of using the barlow bodies too. I used to use the body of my short 2x barlow to get about 6.4A/pixel on the C8, and the long 3x Orion barlow body gave me 3.4A/pixel with the ED80 but we was still quite manageable IMO...
I tried the filter wheel as well, but the loss of focus distance meant I couldn't achieve the dispersion/resolution that I wanted
.
I'm interested to see how it goes anyway.
Being in 25mm segments it's reasonably adjustable!
I guess I'll see if the offset becomes a problem...
Al.