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Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular Review

Updated on May 12, 2011

Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular

Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular

Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular


A lot of people find buying binoculars confusing. It is important to be familiar with numbers like 6x30 when you set out to buy a pair. You will also need to be able to consider any special features or any of the specialized types like night binoculars or stabilized binoculars. The main thing to making the right choice is to think about how you are planning to use them, and then the rest should fall into line nicely.

Read More Reviews of the Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular


Magnification and diameter of the lens are far and away the biggest things that you are going to want to consider when you are buying binoculars. These are clearly labeled on all binoculars with a number like 8x42 or something similar. The first number will let you know the magnification which is nothing more than how many times closer the object will appear. The number that comes second will tell you the size of the lens in millimeters. The bigger the lens the bigger your field of view will be..Unfortunately it’s not simplyabout choosing the binoculars with biggest numbers, that would be far too simple. It can be hard to pick up moving objects if you have a high degree of magnification, so that could be something you want to avoid for some uses. There is a great field of view if you have a big lens diameter but the trade off is very large and heavy binoculars, not a great idea in a lot of situations.


The brightness of a pair of binoculars is determined by the size of the exit pupil and this is another important factor that will need to be considered. You can determine the size of the exit pupil by dividing the lens diameter by the magnification. The larger this number is the more light will get to your eye. This is something you want if you are using your binoculars when it is dark but it it isn’t such a good thing if you are using them when the sun is shining. For use at night you are going to want an exit pupil that is at least 7 mm. On the other hand if you plan to use them in bright daylight 3 mm is probably ideal, 5 mm is a good compromise for general use.


There are a couple of other things that you are going to have to keep in mind but these are mostly a matter of what you feel comfortable with. A few buyers think that something like the prism or how you focus are big issues while other people could care less. You are also going to want to think about any of the specialized types of binoculars that may need like water proof binoculars or stabilized binoculars. Keeping how you want to use the binoculars in mind will help to make certain that you make the best selection for your needs.

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