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Hi G_DAY,
I am Far from an expert on binoculars,but I do own most of the ones you mention,so Best I can answer is.
1: 11x70s,
I have a pair of these,and find them too heavy for handholding,exit pupil is 70mm/11 so around 6.3mm tends to lighten the background a little too much for my likeing.Much prefer 11x56s.
2: 15x70s,Great pair of binos,exit pupil,Well you can work it out now.
Good wide field around 4.5 deg,shows M42 nicely,good contrast.light enough to mount on the better/cheaper camera tripods.
3:Zoom Binos,
I have a pair of 10~30x60s,they are sharp as a tack, until you zoom them up to around 15~20x,very difficult to focus sharply.
One other MAJOR problem with ALL Zoom Binoculars is very small fov,even at the minimum magnification,contrast improves at the slightly higher mags.
MOST,of the experts opinions I have read,ALL seem to agree a fixed Magnification bino,is a better choice.
20x80s,
I received a pair of these for Xmas,Can be handheld,but WAY,WAY Better mounted,you can mount these on a heavier duty camera tripod,
fov,around 3.2 deg,
The moon,and M42 when I first saw them through these,just blew me away,
INMHO,STUNNING.
25x100s,
Now were talking WEIGHT,you had better be prepared to spend almost as much on the tripod as the binos,I have never looked through them,but fov at around 2.5 deg,might be a little restrictive,Thats Just MY opinion.
To sum it all up,
If I had to give up all of my 20+ pairs of binos,except 2,I would choose
11x56 for hand held.
20x80 for tripod mounted.
Hope this helps.
Happy new year.
Regards.
John
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