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James, just further on this - I assume then that you have an STL PSB-1100? If you want to test a different spacing, you could do what I did as an initial test before I got the extra adapters / spacers. I cut out some large "washers" from some hard plastic sheet so that they fit over the threaded section of the adapter (that screws into the STL-11000) and are thus seated on the flange at the base of the threads. I bought the plastic sheet from an art & crafts store in town (Eckersley's) that was 0.6mm thick, and made three of them for a maximum added space of 1.8mm. Since your scope is f5, it is more likely that you will want added distance to the chip rather than less (my 200mm/f6 needed an extra 3mm over the 55mm optimal distance that Televue quotes).
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