As a ‘birder’, the binoculars do not need to meet the same ‘standards’ some folks use to look at the night sky.
Too light a set of binoculars would magnify any ‘tremblers’.
Too heavy a set of binoculars, will tire your arms out quickly, for now, and become a discouragement from watching nature’s beauty.
All the birding sites, the YouTube videos-and there are a LOT, and all the books printed all point to the same general measurements = 8 x 40/ 7 x 35/ 8 x 42. These are the most common, the most available, and will give the most for the money.
Should you see the words ‘wide angle’, you can look at these, as you would a 19 inch flat screen next to a 28 or 30 inch screen! You will have the same distance view, but more to see around the bird you are looking at.
Yes, you can obtain the little 8 x 21/10 x 25 binoculars, but you are giving up light gathering and detail.
7 x 35’s normal or wide angle, will give you the most, since you can use them for seeing the backyard birds, the night sky, and roadside stop vistas.
I own 8 x 40’s, and 7 x 35’s. Make sure you get a nice wide neck strap, not only for making it more comfortable to hang around your neck, but you can use it to steady your arms for looking for a while.
Also .... get a journal of some kind, even a black-and-white-speckled school composition book, and take notes of your sightings, behaviours, and everything you remember.
I wish you well, and much joy in your watchings.
I think what you want for night sky viewing is 7x50. Light admitting.
Thank you. I am going to enjoy my time cooking and watching.
FR is such a wonderful place. I wish I could have you all over for dinner.