Pentax uses both Bak4 and BK7 glass for the roof prisms which have also been phase-coated to prevent the problem of phase shift where the individual wavelengths stepping out of phase with each other as they pass through the prism. The result is a better image resolution and contrast. You must select at least four numbers from 1-20 to make up your Panel 1 selections, and then again for Panel 2. In sharp contrast, the view you get through these is incredibly stable, even when comparing them to a 10x or fairly moderate 8x binocular, the difference is instantly noticeable. Much of this can be explained by the relationship between the size of the shafts of light exiting the ocular lenses known as the exit pupils and the size of the pupils in your eyes. In fact, much of their weight comes from the fact that whilst some of the body is made from resin materials, Pentax has used two types of metal (Aluminium and Brass) for the center of the body (connecting part ).

Whilst it is still usable from the hands, the much higher 16x magnification makes it noticeably harder to keep the image still and shake free, however, the scope is very easy to fit onto a tripod using a standard tripod adapter and is something that I would recommend doing if you plan on using it in the state often or for long periods. In this regard, these perform as well as the Pentax Papilio, which happens to be one of my all-time favorite binoculars, and thus makes them one of the best choices available should you like to view things like butterflies and insects from a very close range. This is all well and good if your intended use and the overall conditions remain the same, but in my experience, this is rarely the case. As well as very minimal color fringing, I never noticed any other sorts of image distortions, and once correctly focused the image remains sharp from the center, right out to the edges with only an extremely minimal amount of softening right at the edge of the view which is really impressive. Another ideal use for these and their low power would be on any sort of unsteady platform, so for example a boat or kayak. However this I imagine would be more useful on small rivers or dams as opposed to the open water at sea where viewing distances are likely to be greater.

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As a spotting scope they are perhaps not as impressive as the binocular or monocular, but even so, they are fine for the occasional use, and I would certainly use them just to gather some information in the distance when needed. In good or even average light conditions, your pupils will be quite small and thus all three configurations will be capable of supplying your eyes with enough light for you to perceive a bright image.When you convert the Pentax VD into a spotting scope, it is not just the body shape that changes, but because the magnification goes from 4x to 16x, the characteristics of view are altered in many ways: Please note that your goods may be sent to you in instalments as availability of products can vary. For example certain products have specific delivery requirements which are explained below. If you fold them up by closing the hinge as you would when carrying them, this increases the depth/height to about 6cm / 2.36 inches, but the width reduces to just 9cm / 3.54 inches.