My personal opinion is that 8x magnification is fine for most applications - especially for things that move significantly. As has been mentioned previously, the bigger the objective lens, the 'brighter' the image and the bigger the field of view. 8x42 are very popular but 8x32 will be a bit smaller and lighter (which might be a consideration). Viking and Opticron are respected brands which have several ranges to suit most budgets.
I have a pair of Viking Navilux 8x32 (actually mine are "Navigator" but that range got replaced with Navilux - cosmetic changes). I went for the 32s because of size. If size is only an issue for some of the time (if it is an issue at all), you might want to think about 8x42 as a main pair but get a cheapish pair of 8x25 for the odd occasion that you want something to slip into the pocket.
Addendum: the size of the objective lens makes a big difference to the image, especially in low light conditions. A bright image at 8x magnification can be more revealing (and easier on the eyes) than a darker image at 10x - when comparing such binoculars side by side, the 8x will feel like a higher magnification. The figure used to measure this phenomenon is called the 'exit pupil' - which is explained here.
I have a pair of Viking Navilux 8x32 (actually mine are "Navigator" but that range got replaced with Navilux - cosmetic changes). I went for the 32s because of size. If size is only an issue for some of the time (if it is an issue at all), you might want to think about 8x42 as a main pair but get a cheapish pair of 8x25 for the odd occasion that you want something to slip into the pocket.
Addendum: the size of the objective lens makes a big difference to the image, especially in low light conditions. A bright image at 8x magnification can be more revealing (and easier on the eyes) than a darker image at 10x - when comparing such binoculars side by side, the 8x will feel like a higher magnification. The figure used to measure this phenomenon is called the 'exit pupil' - which is explained here.
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