Yeah it's 105mm with the 8 and 146 for the 11. Then I have my little frac to consider....don't want to leave it out in the cold...well I do, if it's imaging
It's the general accessories I have trouble justifying...the OAG is $209, then another $49 for a few spacers...it's the unknown more than anything else, because before I realise it I've spent as much as I could on the one from big C, which I saw a few chaps using at AF, serious quality piece of kit...and the big C OAG is US$249 all-in, at least as far as my cats go
Sigh...I know it's futile fighting it
Edit: just saw you mention filter wheel too...which one are you using Barry?