Even with a full bag of long lenses and other camera equipment, binoculars are still a great thing to have with you on safari
Why Use Binoculars if I have a Camera
I find many benefits to having binoculars with me on safari
I use my binoculars for finding animals as they are easier to maneuver than my rig and they are great for spotting birds and animals hidden in the grass. Often my camera is clamped down so the freedom of movement of the binoculars is just what I need. Once I find something with the binoculars and the action begins, then I can get my camera set properly and aimed in the right spot.
During breaks in action, I like to use the binoculars to check the surrounding area and trees for other creatures. I like to stay on the animal with binoculars watching for signs of some photographable action such as signals the cat is about to stand up. It is also fun to be the first to notice the hyena sneaking up.
Since you bag is already full with cameras, make your binocular choice one that is worth the weight and space in your bag: A 10 x 42 powered set will be a useful strength with a 10 x 36 pair a nice alternative.
In general, the higher the power of the binoculars, the narrower the field of view, the less light is taken in by the lenses, and the harder it will be to hold and get a stable image.
This is why 10 x 42 is a good size: anything smaller and your image will be too dark at dusk and dawn lighting and any larger would mean too much weight.
When faced with a choice, go for the widest field of view.
Lens coatings for reflection, anti scratching, and water resistance are essential as is water and fog proofing, good eye piece design, lens caps, and balance in your hands.
Binoculars with Image Stabilization are great for people who can not hold weight steady.
Like lenses, quality matters. It will be reflected in the price of the product as well.
There really is a difference between cheap sets and higher priced sets. The differences will be in quality of glass and the quality or absence of the essential lenses coatings that lead to better image.
I have a pair of Nikon Monarch Binoculars.
Nikon Binocular 10 x 42 Monarch 5
I like these because they are compact and not too heavy. The multicoated lenses give a beautifully sharp image.
I bought mine from B&H Photo Video http://www.bhphotovideo.com/c/product/910864-REG/nikon_7577_10x42_monarch_5.html
A Great Resource for Choosing Binoculars
This site contains reviews and rankings for hundreds of models compares them for different activities ; from sports to birding