In short the advantages of each:
2":
* Larger TFOV in same scope, maximum if 41mm Panoptic with 68 degrees AFOV
* Results in really awesome views at low power.
1.25"
* Lighter weight and less bulky than the 2" of which some are hand grenades, or even (full) beer cans in size and weight
* Resulting in less balancing problems on some scopes. Even my 40cm Dobson got out of balance when applying a 1kg Ethos 21.
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