Author Archives: jvcronje

Nikon Premier LX-L 8×20 and 10×25 Specification Table

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Binocular Basics index

Adjustable eyepiece  Aperture  Armoring of binoculars  Bak-4  BK-7  Basic design  of binoculars Brightness of image in dim light  Central focusing  mechanism Central focusing wheel  Central focusing knob Central focusing toggle  Close focus  Coating of lenses Collimation  Depth of field  Diopter  … Continue reading

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Steiner 8.5×26 Wildlife Pro

Steiner introduced three new compact binoculars, the Wildlife Pro Series Binoculars. These excellent binoculars are pocket size binoculars, manufactured from precision polycarbonate and alloy, wrapped in a non-reflexive rubber armoring and are tough and made to handle tough conditions. All three models … Continue reading

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Pentax 62593 8×25 DCF SW Binocular – Black

The Pentax 62593 8×25 DCF SW Binocular – Black is the most recent release in the Pentax DCF series (launched in February 2008) and is very similar to the Pentax 62594 10×25 DCF SW Binocular, with dual hinge and all, … Continue reading

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Pentax 62594 10×25 DCF SW Binocular – Black

With dimensions of 1.6 x 4.1 x 4.3 inches and weight of only 10.6 ounces, the PENTAX DCF SW 10×25 binocular is indeed ultra compact and a true pocket binocular. It also has a distinctive advantage with the dual hinge … Continue reading

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Pentax 62599 9×28 DCF LV Binocular – Black

Although the objective lenses of the the PENTAX 62599 9×28 DCF LV binoculars are slightly bigger (28 mm) than what could expect from a pocket binocular, with dimensions of 1.8 x 4.5 x 4.6 inches  and weight of only 13 … Continue reading

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Image brightness in dim light

Three factors determine the brightness of the image in dim light: The quality of optical coatings, a factor determined by the size of the exit pupil and finally a factor determined by the objective lens size and magnification. Lens coatings: … Continue reading

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Depth of field

The “depth of field” of a binocular refers to its ability to keep objects further towards the background and closer towards the foreground in focus without you having to adjust the focus. Stated in another way: Once you’ve focused on an … Continue reading

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Focus speed

If you need the binoculars for watching wild animals, in particular birds, the speed of focus is important. While following a bird in flight, you need to change the focus all the time if the bird gets closer or further, … Continue reading

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Close focus

Focusing at a distance is no problem for any pair of binoculars; focusing at close range, however, is a totally different matter. This is important, since sometimes you will be in a situation where close focus is important, in particular … Continue reading

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