View Single Post
  #48  
Old 23-10-2018, 08:05 PM
cometcatcher's Avatar
cometcatcher (Kevin)
<--- Comet Hale-Bopp

cometcatcher is offline
 
Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,542
Quote:
Am I right in saying that an f/5 gathers light 4x as fast as the f/10 ? So in theory a 15s sub would be roughly the same as a 60s sub on the f/10 ?
For extended objects like nebula, yes. For stars, aperture is what makes a difference.
Reply With Quote