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nobody

02 Mar 2024 16:33



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Evident este vorba de diametrul obiectivului de 50mm, nu de focala, se vede dupa proportii.
Totusi la pretul ala ar trebui sa specifice si focala si backfocus-ul ca la o luneta similara:
The implementation as well as the configuration is just
as important too; for instance, guide scopes may be an
inexpensive 80-mm f/5 doublet refractor, a 50-mm f/4
finder, a re-purposed camera lens or anything in between.

Strict despre rezolutia de ghidaj:
The focal length and guiding resolution is also a
consideration but less important than one might think:
Since the guider software can determine sub-pixel star
centroid accuracy, as a rule of thumb, if the imaging focal
length is no more than 10x the guiding focal length, you
should have sufficient tracking resolution.

Un calculator de CCD: https://astronomy.tools/calculators/ccd
Formula:   (   Pixel Size um /   Telescope Focal Length mm  )   X 206.265 = Resolution "/pixel

P.S. In astro "o luneta de 50mm" inseamna implicit diametrul aperturii, spre deosebire de obiectivele foto unde lumea foloseste focala, raportul focal (la care-i zice in mod impropriu "aperture" de ex. f/4.0) si aproape niciodata diametrul aperturii.