SPINA OPTICS 3-9X32 Rifle Scope, AO, RGB Mil-dot, QD Rings , Black

Product Information

The eyepiece housing looks to be made from aluminium or something similar, whilst the twist-up eyecups look to be made from a hard plastic, which have then been covered in a thin soft rubber coating. They are fairly comfortable even when pushed quite firmly against your face. The ocular lens has a diameter of 18mm, whilst the eyecup has an external diameter of 37mm. I'm amazed at how saturated the market is for low priced bins even though many are actually re-badged clones, not new models. I guess more people than just you and Frank must be buying them or they wouldn't keep coming out with new clones every few months. The amount of softening of the image on the periphery of the view was extremely minimal and definitely wont bother you. So once again rate these very highly in this department. As you would expect, the Pentax's field of view is not quite as wide as the best mid-sized 8x binoculars that I have reviewed and they do have a wider field of view than the 10x binoculars in the same sort of price range, but compared to the very best 10x mid-sized ones, it does still fall short. I think it is important to stress that you have to keep in mind the price difference between these and the very top of the range ones on the list above.

To me the contrast of the image was very good and once you have correctly focussed on an object the image is pin sharp. I also thought that the color reproduction looks and feels natural, which is not always the case on some binoculars, especially cheap ones that often have artificial looking tints. Like majority of roof prism binoculars, the diopter adjustment ring is located on the right barrel, between the eyecup and the barrel. It looks to be made from metal, but unlike most others that I review, it is not covered in rubber, however grooves in the ring do help with the grip when turning it to adjust your setting. For those that don't know, this diopter adjustment ring is used to correctly set up and focus the binoculars to your particular eyesight. This process really only needs to be done once when you first use the binoculars, or if you share them with others. Focusing is achieved via the very large (diameter 33mm) center focus knob, which on the sample that I used turned smoothly, but was fairly tight. It looks to be made from a combination of metal and a very hard plastic that has then been covered with a ridged rubberized coating to help with grip. Holding the binoculars up to my eyes, it was easy to reach and I had no problems adjusting the focus without having to change my grip.

My "premium" Nikon porros have spoiled me. You get your cake and eat it too with the EIIs and SEs at Entenmann's prices. The army green hard rubber armour that covers the main housing is nicely contoured and provides a nice grippy surface and should protect the optics from minor bumps and scratches. This covering will also help to dampen down any sounds made from objects striking against the binocular that could frighten away easily spooked birds and other wildlife. It also has another benefit of making the binocular less reflective - bright light reflecting off a metallic object could also easily frighten away wildlife. The body itself is made from tough and lightweight polycarbonate, which is fairly commonly used material in this price range.

I felt that the overall balance of these Pentax DCF binoculars was excellent and this is where the thumb indents that encourage you to get your hands into exactly the right position help. Whilst the balance on smaller, lighter binoculars like these might not be quite as important or even noticeable as on larger optics, it is still something that should be taken into consideration. A badly balanced binocular will be far less comfortable to use, especially over longer periods of observation. A well balanced binocular like this is also far easier to keep still, which helps you to maintain a steady, shake free view.

Please note:

Ideal Uses: Like most mid-sized binoculars these are ideal travel binoculars, perfect to take on a camping trip. Their size and 9x magnification means they also make excellent safari binoculars, especially if you like to observe birds as well as the larger land fauna that Africa is most famous for. As such, I would also say that these Pentax binoculars would be great for general wildlife observation and even some types of hunting where size and weight are important. Like most mid-sized binoculars these make a good all-round general use binocular. The air inside of the binocular has also been replaced with dry nitrogen gas during the manufacturing process to prevent internal fogging and thus makes it possible to use the binoculars in places where there are rapid temperature changes, very low temperatures or high humidity levels without the risk of any condensation forming on the inside the binocular. Another benefit of this is that because there is no internal moisture, it also protects the inner workings from corrosion. When I spoke to the guys at Pentax about which binoculars I should review for them next, I said that I wanted a quality pair of optics and if possible something that stands out a little from the crowd. That was when they introduced me to the DCF BC 9x32 binoculars. It comes with a whole host of quality features as wall as a fairly unique 9x magnification. Are these the ideal binoculars for those who can't decide between an 8x and 10x magnification? Take a look at my full review of the Pentax 9x32 DCF BC binoculars:

Includes: Weaver Mounts, sunshade, flip-up capsIN THE BOX?Vector Cerato Ultra Compact 3-9x32 SFP Mildot AO (3 yards) Rifle Scope with Free Weaver Scope Rings. I really love the twist-up (helicoid) mechanism on these Pentax binoculars - it is very smooth and has an impressive 5 fixed stops (3 intermediate), meaning that eyeglass wearers have a huge amount of flexibility when adjusting the eye-relief to suit their exact needs. The maximum of 16mm of eye-relief is pretty good and should be enough for most people who wear glasses to be able use these optics without having to remove their glasses and still get the full field of view without any vignetting. Non-eyeglass wearers will just use the eyecups in the fully extended position. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. Their dimensions of 12.8 x 13.8 x 5.2cm (5.0 x 5.4 x 2.4in) is pretty good and they compare well with most other quality mid-sized binoculars: As a reference the Swarovski 8x32 Traveler EL has dimensions of 13.8 x 11.4 x 6.0cm

Fun

Wolfram|Alpha is a great tool for factoring, expanding or simplifying polynomials. It also multiplies, divides and finds the greatest common divisors of pairs of polynomials; determines values of polynomial roots; plots polynomials; finds partial fraction decompositions; and more. A polynomial with rational coefficients can sometimes be written as a product of lower-degree polynomials that also have rational coefficients. In such cases, the polynomial is said to "factor over the rationals." Factoring is a useful way to find rational roots (which correspond to linear factors) and simple roots involving square roots of integers (which correspond to quadratic factors). I posted something in the Sightron Blue Sky thread as the two appear to be practically identical binoculars. Specs are below....