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Hi Esseth,
As the people at Andrews would have mentioned, the higher the magnification, the narrower the field of view. Also, unless you have some way of holding the binos really steady, the shake in the binos will make them near impossible to use. There is also the issue that the higher the magnification, the dimmer the image will be. Binoculars are really two 'rich field telescopes' side-by-side. With a 50 or 60mm objective, I would keep the magnification down. If you then go for 'astro' binoculars, say 80 or 100mm, increased magnification of 16 or 20 is necessary because of principles of optics, & you will also be using a tripod to hold them. But you then have a large piece of glass to gather light.
FMC & MC I don't think will make a great deal of difference. These coatings are designed to reduce internal reflections within the glass elements of the optics, thus reducing 'ghost' images. Unless you mistakenly look at a flood light at night, I doubt you will really notice any difference. If you have the dollars, well, up to you.
Here is one thing that blew me away with binos, even a 30mm finder. Last month I took my viewing to a dark site. I have two finders fixed to my big dob, a 6X30 & a converted 7X50 monocular (was a set of binos, a cheap set from Andrews). From this site, 2hrs from Sydney, I was still able to view galaxies, like M83 & Centuraus A, through the 6X30 finder! They obviously presented no challenge to the 7X50.
From my home in Sydney, I NEED 50mm binos to find anything in the sky first. It is the only way I can see enough stars to star hop.
Should you get your mits on a 8X60 pair & mount it onto a tripod, you really have a wonderful setup to view the heavens. You will also very quickly learn to find your way around the sky.
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