Talk:Non-achromatic objective

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Deletions

I have rm'ed the following to talk since in its current form it is non-encyclopedic advice (WP:NOTMANUAL):

A common beginner mistake in designing monochromatic objectives to be used with near-zero field of view, such as collimators, is to design only with zero field of view. The lens design program optimizer will only correct what it knows about any given lens. Such a lens will likely have sharp on-axis performance, but may have enormous coma, rendering it virtually un-manufacturable and unusable in practice. A zero-field lens should always be designed with a nonzero field of view so that its manufacturing tolerances and quality control are practical, and its alignment tolerance in the final system is reasonable.

75.197.145.65 (talk) 18:49, 13 May 2009 (UTC)[reply]

Plano vs biconvex?

If one doesn't have access to achromatic lenses then which simple lens is better for telescope objective: plano-convex or biconvex?

47.29.65.204 (talk) 16:32, 2 July 2017 (UTC)[reply]