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Alex,
Many thanks for wading through my somewhat garbled question/s. I left a huge critical description/question out of the Prism-Mirror question. I am purchasing the prism for daytime use, whale watching. The question I should have forwarded is how good are prisms at astronomical observation within the broader context of day-time terrestrial observation. I shouldn't ask important questions late at night, my bad.
Subsequent to posting my question I have ordered a 2" Williams Optics Prism Diagonal for daytime terrestrial observation eg: Whale watching. Its looks like a beautiful piece of kit, reviews on the diagonal reflect your concerns with erect image prism diagonal terrestrial configured devices and expecting them to work perfectly within the context of dark sky. Erect prism image diagonals cannot work as well as a mirror or even standard prism.
You have answered my question about the Meade 56mm, your explanation is clear and concise, many thanks.
I have profound neurologically induced vision loss that explains in part my absolute fascination for all things optical. I am reading ever more on the subject of optics and I have thousands of questions. Next time I post it will not be late at night with a poorly described/framed question.
Alex, many thanks.
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