What minimum specification of large binoculars is often cited as necessary for detecting M101 in ideal conditions?

Answer

15x100 or 20x100

The text suggests that seeing M101 requires instruments larger than standard binoculars, often specified as 15x100 or even 20x100 models, typically mounted on a tripod.

What minimum specification of large binoculars is often cited as necessary for detecting M101 in ideal conditions?
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