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Optics » Binoculars » Binoculars » Pentax
The DCF ED binocular series is the new binocular generation – which catapults Pentax on to the world stage. As well as the technical characteristics you take for granted with Pentax binoculars, such as the use of inner focusing, phase-corrected BaK4 prisms, JIS 6 classification and nitrogen purging, ED (Extra Low Dispersion) lenses and dielectric coating of the BaK4 prisms now make their entrance on the Pentax objective lenses. To maximize light transmission, in the DCF ED Pentax reverts to the proven smc multi-layer coating. In this way the DCF ED eliminates irritating reflections. A further measure to ensure outstandingly faithful colors and contrast is the dielectric coating of the BaK4 roof prisms. In combination, these characteristics achieve the best possible image and color rendering. The DCF ED was conceived basically to satisfy the high demands made by bird watchers. No easy task, but passed with flying colors! More
The DCF ED series is also tough. Thanks to the magnesium body the binocular is light, but this together with the rubber armouring gives very good impact protection.
The binocular has also the best protection against water ingress. The DCF ED series of binoculars have JIS 6 classification, which means they are waterproof up to 1 meter. This is achieved by use of double O-ring seals and by purging with nitrogen. The scratch-resistant coating of the objective lenses is a further characteristic of these binoculars, which gives optimum protection to the front lenses.
A further factor contributing to its extraordinary optical characteristics is the use of aspherical lenses in the eyepieces. These achieve excellent sharpness right to the edge of the image, giving viewing pleasure par excellence.
A prism is a complex optical element necessary to correct the image to right way up,
and reduce overall length of the binocular.
In a prism, light travels through complicated angles and so the quality of the prism glass used is of significant importance.
Pentax uses exclusively high-indexed BaK4 prisms; made of very pure Barium glass.
Aspherical Eyepieces lens:
Edge to edge sharpness is a vital element to comfortable viewing. To achieve this Pentax utilise aspherical lens elements in their eyepieces.
This is a specially shaped lens design that reduces aberration to a minimum.
In their SP and ED models they use hybrid-Aspherical lens elements that have the additional advantage of superior functionality while being lightweight and compact.
Challenge the Elements:
Pentax is one of the few companies who physically test their sport optics against both recognised JIS norms to classify the degree of resistance to environmental influence.
They define and test against: JIS 6; The product is fully water proof and has maximum protection against rain, dust, moisture or internal fogging due to extreme temperature fluctuations.
Their binoculars are double O-ring sealed as well as nitrogen purged so that temporary immersion into
1 meter of water will have no negative effects.
Phase Corrective Coatings:
In roof prism binoculars, light rays are mirrored several times which can result in reduced light transmission.
By adding an additional Phase Correcting coating the light-rays frequencies are corrected to their original values.
Pentax use the latest Phase Correction coating on all their roof prism binoculars.
Dielectric coating of the prisms serves to enhance the colour "truity" of the image.
Up to 70 layers of surface coatings are "vaporised" onto the surface of the prisms in a vacuum. This maximises the quality of visible light in the colour
spectrum between infra-red and ultra violet.
The Inner Focus function is critical to low-maintenance and long life guarantee. Exposure to airborne particles and moisture is avoided, thereby ensuring that no outside
influences can penetrate the binocular housing and disrupt functionality.
To build superior binoculars, the ultimate challenge is to avoid colour errors. Several techniques are available but by far the best result can be achieved by using ED
(or extra-low dispersion) glass in the objective lens. ED-lenses have a high breaking index with minimal dispersion. In other words: the higher value colour spectrum wavelengths are reduced to an absolute minimum.
The result of ED-optical elements is comparable to the use of Apochromatic lenses, but now only two lenses are used.
The advantage is clear, lighter, more compact binoculars.
Included Accessories: Objective caps and eyepiece caps, carrying case, carrying strap
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Registered Office: 13 Frensham Road, Sweet Briar Industrial Estate, Norwich, Norfolk, NR3 2BT. Showroom: Unit B Frenbury Estate, Drayton High Road, Norwich, NR6 5DP.
Technical specifications are for guidance only and cannot be guaranteed accurate. Errors and omissions excepted.
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