What specific component or designation should one look for if planning to use a telescope for daytime viewing where a right-side-up image is required?

Answer

Models advertised as "spotting scopes" or confirmation of an erecting eyepiece.

When adapting an instrument designed primarily for astronomy to terrestrial use, the inherent image inversion becomes a practical impediment. To counteract this optical flip and provide an image oriented correctly (right-side-up), specialized optical configurations or components are necessary. Manufacturers addressing this need either market the instrument specifically as a spotting scope, which inherently incorporates the necessary image-correcting optics, or they include an erecting eyepiece. This erecting eyepiece contains additional prisms or lenses specifically designed to re-orient the light path before it reaches the observer's eye, ensuring that terrestrial objects appear in their correct spatial orientation, even though this correction might slightly diminish the overall light transmission.

What specific component or designation should one look for if planning to use a telescope for daytime viewing where a right-side-up image is required?

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