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Old 18-09-2020, 06:35 AM
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mental4astro (Alexander)

mental4astro is offline
Join Date: Jun 2008
Location: sydney, australia
Posts: 4,883
Same aperture, same magnification, same image brightness despite different f/ratios

Where things begin to change, say with reflectors (of whichever flavour you care for) is the condition of the reflective surfaces. Namely reflectivity drops over time. With refractors, needs similar/same glass types and coatings.
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