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Hi Turbo,
I had no idea about change in focus as the eyepiece is zoomed (it came with a telescope and I have not used this zoom eyepiece), soo, I have just checked for myself now:
On a Televue Pronto (70mm aperture, focal length 480mm, f6.8), the difference in focus is about 1.5mm on the draw tube in moving from the eyepiece indication of 8mm to 24mm. This appeared to be a small alteration in focus, as a visual user that is.
The eyepiece has no detent stops, but does have an indication at 8mm, 12mm, 16mm and 24mm settings.
Thanks Mark
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