Hi Bill,
Good to know your another long fl achro fan....like Brian and myself
I too have the 70x900 which I really like and rides as a finder scope on my 6" f12 refractor.
I'm not surprised at the badly placed...or intentionally perhaps...baffle. heard of it many times with ST scopes.
To complete my long achros I have a 6TE...50mm f12 Tasco which is a real cuttie.
I like your idea of cutting the baffle and sticking a proper sized baffle on it.
Please post your results.
Matt
Ohh I forgot....90x1000 Achro from the mid 90's....great scope...so good I kept it and sold an ED 100 f9.