Step 1: With right eye closed, rotate the central focus knob until image in left eyepiece is clear and sharp. Step 2: With left eye closed, rotate the independent right diopter knob until the image is clear and sharp. Step…
FAQ Group: Binoculars
Binoculars
What does fully multi-coated mean?
Fully multi-coated means that every optical surface has an anti-reflective (AR) multi-coating to maximize light transmission.
What is light transmission?
Light transmission is the resulting light that gets to your eye from the object. Typically, some light is lost due to reflections from the optics so there is always some loss of incoming light, even with the best anti-reflective coatings.…
What is chromatic aberration?
Chromatic aberration, also known as color error, is caused by dispersion, where light spreads out according to its wavelength like a rainbow. This effect also happens in a lens, so different lens materials or designs can reduce chromatic aberration. Chromatic…
What is dispersion?
Dispersion occurs when the colors of light spread out due to different wavelengths. Think of a rainbow: this is what dispersion looks like. White light is the combination of all colors; when reflected off something like a water droplet or…
What are dielectric coatings?
Dielectric coatings are a type of reflective coating. They are one of the best grades of coatings available to maximize light transmission.
Which is better, a BAK4 or BK7 prism?
BAK4 is a higher-grade prism glass than BK7, but the glass type does not have a critical difference on overall performance.
How do I calculate Relative Brightness?
Relative brightness is the exit pupil diameter squared. For example, an 8×42 binocular with an exit pupil of 5.25mm has a relative brightness of 27.6, while a 10×32 binocular with an exit pupil of 3.2mm has a relative brightness of…
How do I calculate Twilight Factor?
Twilight factor is the number used to calculate the relative effectiveness of binoculars in low light situations, such as hunting at dusk. You can calculate the twilight factor by taking the square root of the total magnification and multiplying it…
What materials are the binocular chassis made of?
Most are made of plastic (like polycarbonate), aluminum or magnesium. The different materials have different costs, strengths and weights. Plastic would be the lightest and least expensive. Aluminum is more expensive and heavier than plastic. Magnesium would be the most…