My 6" f/10 has a 54" tube. The cell is mounted recessed in the sky end, and I have a University Optics 2" focuser on the other end. That thing is almost identical to a Meade 680, so it's about 4" high by itself, and with another 3.5" added (needed) for a 2" diagonal, I'm right up around 61.5" from the center of the lens.
I'll still give it a check tonight, though.
-Tim.
-------------------- "In the old days, before the discovery of eruptions, the lava had to be carried by hand down the mountain and thrown on the sleeping villagers. This took a lot of time." - New Yorker Cartoon, ~ 1980