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Hi ferret
Not a direct answer, but here is my experience with a zoom lens on my wife’s spotting ‘scope, a 77mm Leica apo.
Using the Leica 32mm standard eyepiece gives a very pleasing and satisfyingly wide field of view.
Using the Leica x20 to x60 zoom eyepiece gives me the feeling of looking down a tunnel, not as bad a looking down a straw, but certainly nowhere near as pleasing as the standard 32mm eyepiece. Therefore, the zoom gets little use in the field.
It might be that to achieve the focal length range for a zoom eyepiece, other characteristics such as field of view may suffer? Historically, prime focal length eyepieces have tended to out perform zooms across most of the important parameters. I’m not certain if modern zoom eyepieces have overcome these deficiencies, in much the same way that modern camera zooms have almost equaled the performance of prime photo lenses.
Cheers
Dennis
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