View Single Post
  #11  
Old 29-04-2008, 08:42 AM
Rodstar's Avatar
Rodstar (Rod)
The Glenfallus

Rodstar is offline
 
Join Date: Jan 2005
Location: Central Coast, NSW
Posts: 2,702
Quote:
Originally Posted by Zuts View Post
Hi Rod,

I thought the Ethos 13mm hardly ever left your scope and was good for most objects. This may be a dumb question but would there be a great difference between an 8mm Ethos and a barlowed 13mm Ethos.

Paul
Hi Paul,

Not a dumb question at all, and the difference is not so great between those two options.

A 2x Barlowed 13mm Ethos would give me 384x. An 8mm Ethos unbarlowed would give me 312x.

I use a 9mm Nagler at the moment when the seeing is solid enough to ramp up the magnification from the 13mm Ethos, giving me 278x with a FOV (roughly) of 18 arc minutes. It holds a sharp view perhaps 50% of nights.

The 9mm Nagler suits my purposes very nicely at the moment. I wonder if the 8mm Ethos could be justified, as the FOV would only be about 1.5 arc minutes greater, and as it would come in at a magnification that would be held up perhaps only 1/3 of nights, it may be used too infrequently to justify the large price tag (whatever the price ends up being).

I might hold back on this one and have a borrow of someone else's before purchasing.

I am sure the 8mm Ethos will be a very attractive option for the shorter focal length scopes.
Reply With Quote