Yes, that's correct. I believe it's due to central obstruction and the large scale. I take daytime photos and lunar panoramas without a Barlow lens; I only use it for planets.
Today I went to the store with a Barlow lens, camera, and telescope. We tried several lenses and telescopes, but the glare is still there. I went to my sister's place and swapped the camera for another of the same brand and model—still getting circular glare spots. Somehow, there's no information about this anywhere?
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