Quote:
Originally Posted by torana68
ok, i dont own an open tube Newtonian so this is just out of interest, would the degradation be in the order of say 5% at worst (compairing to a theoritical 100% perfect image)? when you say images do you mean visual? thanks for the input. 
Roger |
I've never really thought of it like a percentage. The simplest way to describe it is to say that an observer can harm delicate images like double stars and planets. It makes the images soft and fuzzy.