Tried Izar again last night, but this time with a 50mm mask on the Megrez 110ED.
At 131x and 205x, the companion looked like a slight bluish colored brightening on the primary's diffraction ring.
Much more subtle than the view using 58mm aperture.
I think 50mm is at or close to the lower limit of aperture for detecting the binary nature of Izar.
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A few telescopes of dubious value.
Understanding wife and three curious cats.