Outdoor Quotes: (Fishing)

Give a man a fish and he will eat for a day.  Teach him how to fish and he will sit in a boat and drink beer all day.

Author Unknown

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
  • 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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Image Intensifiers

Image Intensifiers

Night Vision scopes are electro-optical devices that intensify (amplify) available light.

The main component of such a device is the Image Intensifier - basically a vacuum tube.

At the input end, the objective lens collects the particles of light (photons) arriving from the subject and focuses them on the image intensifier tube.

Inside the image intensifier tube a photocathode absorbs these photons and converts them into electrons which are amplified and projected on to a green phosphor screen at the rear.

When this highly intensified electron image strikes the phosphor screen, it causes the screen to emit light that you can see.

Since the phosphor screen emits this light in exactly the same pattern and degrees of intensity as the light that is collected by the objective lens, the bright night-time image you see in the eyepiece corresponds closely to the outside scene you are viewing.

The phosphor screen is coloured green because the human eye can differentiate more shades of green than any other phosphor colour.

Intensifier Gain

The number of times the screen image is brighter than the one arriving at the photocathode is called the gain of the Intensifier.

However, gain is a function of two factors, the ability of the photocathode to convert the weaker photons into electrons, and the amount of amplification which accelerates these electrons onto the screen.

If the type of photocathode is fixed, more gain means more screen brightness, not the ability to see better in the dark.

There are two ways to measure gain - tube gain and system gain.

Tube Gain

Tube gain is usually seen in values of tens of thousands and is more a laboratory figure that is not necessarily indicative of a devices performance.

If tube gain is too high, the tube will be “noisier” and the signal-to-noise ratio may go down.

System Gain

System gain is based on the total system ie. tube, optics, power supply etc.

System gain is usually seen in the low hundreds for Gen 1, mid-hundreds for Gen 1+ and 1000-3000 for Gen 2/2+/SuperGen/HyperGen and Gen 3.

System gain is the figure that potential night vision purchasers should compare.

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