View Single Post
  #2  
Old 18-09-2020, 06:35 AM
mental4astro's Avatar
mental4astro (Alexander)
kids+wife+scopes=happyman

mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 4,869
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.
Reply With Quote