How To Use Rangefinder On Marine Binoculars?

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How To Use Rangefinder On Marine Binoculars
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• Rangefinder, when you search on Google, there
  comes many results from laser rangefinder. They
  are mostly used for golf or short range distance.
• But what we're going to talk about in this
  article is the rangefinder on binoculars. It is
  completely optical type.
• They usually have a scale in the right field of
  view corresponding to the measurement, although
  it is not possible to directly read the distance
  value, but because of their purely mechanical
  way, in a way, is more suitable for the
  binoculars.
• Note while the rangefinder on the binoculars
  also requires batteries, they are for
  illumination use only.

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How does optical rangefinder work?

• There are actually systems for calculating the
  distances used in rangefinder cross binoculars
  and oscilloscopes. The simplest and most common
  method is to compare the scale or measurement
  mark on the marker in the binocular, monocular or
  oscilloscope field of view with a known size
  section or the entire object you are viewing. In
  military and hunting circles this is often
  referred to as the Mil-Dot marker and the formula
  for calculating the distance is called the
  Mil-dot formula.

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Are rangefinder markers valid?

• Yes, while they are not as accurate and fast as
  laser rangefinders in providing accurate values
  over short distances, they can give you a good
  idea and can be useful over long distances. Their
  accuracy depends on how well the user aligns the
  targets and, of course, how accurate they are in
  estimating the height or length of the targets.
  If you know the exact height of the targets and
  align them very carefully on the markers, they
  will be very accurate.
• And considering that the battery-free operation
  makes the binoculars suitable for more
  environments, the matching compass can also
  provide an important role in navigation and
  outdoor use.

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Further Reading

• For USCAMEL Optics hot sale binoculars with
  rangefinder and compass. There is an additional
  tool for easily getting the distant number.
• How to use the calculator on your binocular to
  estimate distance
• The Calculator Dial can be used to determine the
  distance quickly and easily without using the
  above calculation. The Calculator Dial comprises
  a rotational active ring showing a triangular
  "ANGLE" marking and affixed scale marked
  "DISTANCE". There are two scales in the Active
  Ring, the upper scale is View Angle and the lower
  is a Size Scale marked "OBJECT SIZE".

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How to use the calculator on your binocular to
estimate distance

• The Calculator Dial can be used to determine the
  distance quickly and easily without using the
  above calculation. The Calculator Dial comprises
  a rotational active ring showing a triangular
  "ANGLE" marking and affixed scale marked
  "DISTANCE". There are two scales in the Active
  Ring, the upper scale is View Angle and the lower
  is a Size Scale marked "OBJECT SIZE".
• First, measure the View Angle values of an
  object, rotate the Active Ring and place this
  value at the angle index mark. Then, find the
  division indicating the size of the object, where
  the size meets the distance scale indicates the
  distance to the object.

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• For example See fig.7. You observe a lighthouse
  and its measured Vertical View Angle is 60mils.
  Rotate the Active Ring and place the division
  marked "6" in the View Scale Angle index Mark.
  Its height is 12m, the division marked "12" in
  the Size Scale lines up with the division marked
  "200" in the the Fixed Scale.
• This tell us that the lighthouse's distance is
  200m from us.
• Where the size of the observed object is outside
  the scale just divide the size of the object by a
  number that will bring your object size to within
  the scale and divide the View Angle by the same
  number. As the values are on a fixed scale ratio
  the resulting value on the dial will be correct.
  (There is no need to multiply out the result).
• Source https//uscameloptics.com/blogs/optics-101
  /how-to-use-rangefinder-on-marine-binoculars

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Thank you for reading!