Hi Martin.
Please forgive but I'm a Rank Amatuer...
There are several pieces, the I.D. of the Lense Holder (attached to the scope, Photo() is (using just a rule) 29-30mm.
I have lenses labelled. Barlow Lens 3x (this is just a hollow tube with a lense at the narrow end), H4mm, H12.5mm, H40mm and a long one labelled '1.5 x Erecting Eyepeice'. I also have a little cannister same as a 35mm Film Cannister and another item that looks like a Screw In (Green) Filter.
Reuben
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