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Hi Ziggy, I'm not aware that it makes any difference to the quality of your view where the filter sits in the optical train (i haven't noticed myself anyway). I only have 1.25in filters but then again most of my eyepiecs are 1.25in. If I were more into deep sky and wanted a filter for use with multiple eyepieces though I'd go for a 2inch set into the diagonal (I use a WO 2in dielectric) to save all that fussy screwing and unscrewing. Hope the WO crayford works well for you, I had thought to get one for my C9.25 but ended up opting for the Meade Motorfoucs unit - if you want to do planetary imaging then a motor focus makes a BIG difference!
cheers,
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