Hi T10
Have you read up as much as you can about binoculars for astronomy? Do you have a pair already? What are they and what is your experience with them?
You could read here:-
http://www.iceinspace.com.au/index.p...63,374,0,0,1,0
and go to AOE's page and look for their introductory articles on binoculars:-
www.aoe.com.au
Now, just from what you wrote, these binoculars have a ruby coating (looks red at the field lens (the other end to the eye)). These are designed to reduce glare for daytime viewing. They reportedly just reduce the light collected in astronomical situations. You should be look for FMC only - fully multi-coated on all surfaces. They often have a green appearance at the field lens.
The also are a zoom binocular - magnification ranges from 18 times to 52 times. Again, from what I read, most reviewers are not happy with zoom eyepieces - usually the mechanical performance doesn't keep stars in accurate focus as you move and adjust them.
Additionally, if you calculate exit pupil size, you will see the upper part of this magnification range does not produce a big enough exit pupil for astronomical use. It may be OK for daytime use in bright conditions.
The aperture of 80mm is also on the small side if you want to go to these higher magnifications - for astronomy use, the images will be not very bright.
If you are looking for a "giant" pair for astronomical use, think of a fixed magnification - 20x80 or 25x100 are common.
Be aware that, for astronomical use, any of these, including the pair you are looking at, will need a substantial mount - probably more than a basic tripod.
Sorry to be discouraging about this pair that you have found. Keep reading and search for threads on binoculars on this site - there is a lot of experience available. Ask more questions?
Eric
