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That’s only true of some MCTs - certainly not all. There’s a thread somewhere on CN listing the results for many scopes of the flashlight test.
There’s another clue too. Shining a torch inside you’ll see the gap between the OTA and mirror which gives a fair idea of its diameter. Compare with the clear aperture of the front or alternatively the difference between the inner wall of the OTA and that of the corrector cell.
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