Outdoor Quotes: (Fishing)

My biggest worry is that my wife (when I''m dead) will sell my fishing gear for what I said I paid for it.

Koos Brandt

Hunter Jacket

Binding: Misc.
Brand: Jack Pyke
Studio: Jack Pyke
Label: Jack Pyke
Publisher: Jack Pyke
Manufacturer: Jack Pyke
List Price: £63.95
Price: £63.95
View more offers Buy New From: £63.95
Features:
  • Waterproof and breathable
  • Adjustable and detachable emergency hood hidden in collar
  • Two hand warmer chest pockets & two bellows pockets complete with cartridge holders
  • One internal chest pocket & hook and loop cuffs
  • Fold out attached waterproof seat flap

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Product Description: Jack Pyke Hunters Jacket is a lightweight and practical hunting jacket made with soft and silent Breatha-Tex stealth fabric. Waterproof and breathable, this comfortable jacket comes with an outer layer made of brushed tricot polyester with a laminated membrane, and brushed mesh polyester and taffeta lining. Its generous fit allows room for additional layers to be worn underneath and it features a adjustable and detachable waterproof emergency hood folded inside the high collar. It also has a press-stud storm flap over the full front two-way zipper closing for extra protection against elements, attached fold out waterproof seat flap at the lower back, elasticated shrouds at both wrists and secure hook and loop cuffs for even more protection. Moreover, there are two hand warmer pockets on the chest, one inner chest pocket and two large bellows side pockets with press stud storm flaps and useful cartridge holders inside. Perfect for hunting, fishing, wildlife photography and general outdoor wear.


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Exit Pupil

Exit Pupil

The exit pupil is the size, in millimetres, of the beam of light that leaves the binoculars to enter the eye. It is measured by dividing the size of the objective lens by the magnification.

So, in an 8 x 40 binocular the exit pupil will be 40 mm divided by 8, which is 5 mm.

The importance of this is how it relates to the size of the users pupil.

Maximum Dilation of Human Eye

The pupil in a human eye can vary from about 2 mm when it is very bright, to about 8 or 9 mm when it is very dark. This maximum dilation decreases as we get older, and by the age of 50 the maximum will be about 5mm.

If the exit pupil of the binocular is bigger than the user's pupil, then some of the light will fall on the iris and so is wasted. This will make the image appear dim.

Also, resolution and contrast are adversely affected which results in loss of clarity.

What this means is that the exit pupil of a binocular should be at least 2 mm, but no more than 9 mm.

A human pupil adapted to daylight will normally be between 2 and 3 mm.

Therefore, if you will mainly be using the binoculars or monocular in daylight (or you are over 50), the exit pupil should be somewhere between 3 and 5 mm.

Low-Light Levels

For low light observation, a larger exit pupil would be more suitable (8 or 9 mm).

It should also be noted that it does make a difference if you are going to be using the binoculars when it is difficult to hold them steady (when out on a boat, for example).

In this sort of situation it is better to have an exit pupil greater than the eye pupil. This is because it will be easier to keep the eye pupil centred on the larger exit pupil.

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