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Neven,
I have a SM60 scope. There's a detachable front filter element which sits on a split adaptor ring...this is a tuning ring where you can tilt the front etalon and tune into Ha.
At the rear of the scope there's a "gold" diagonal. This again is removable and contains both a "mini" energy rejection filter and more importantly the blocking filter which works as a "matched set" with the front element to give safe viewing/ imaging.
So, if the front filter and the rear blocking diagonal are ALWAYS used together you can move the combo to another telescope.
I've done this. The filter set is now mounted on my ED80.
HTH
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