Kowa 10.5x44 Genesis XD Binoculars

Often called XD binoculars in Europe, The Kowa Genesis binoculars are aimed at the high end of the market designed to take on the likes of the best Zeiss, Leica, Swarovski and Nikon binoculars. The Kowa Prominar Genesis XD 10.5x44 Binoculars are manufactured in Japan to the highest standards using the best quality components and optics available.

Main Highlights

• Prominar XD Lenses
• Diopter Locking System
• Waterproof
• Filter Threads on Objective Lenses
• Large 44mm Objective lenses
• Close focus of 5.5 feet (1.7m)

The outstanding feature of all the Kowa Genesis XD Binoculars and is obviously included in this 10.5x44 version is the use of optical technology taken from the Kowa Spotting scopes and mainly the PROMINAR XD lenses to produce a binocular that is according to Kowa chromatic aberration free.

Genesis Optics

Making use of technology from the popular Kowa TSN spotting scopes, the two binoculars in the XD44 series were the first full size binoculars from Kowa to use to use Prominar XD lenses (extra low dispersion glass) and have paired their XD lenses  with convex lenses made of glass that have special dispersion properties that is said to reduce chromatic aberration even more. These ultra high quality lenses are not cheap to manufacture and so are only used on Kowa's top end binoculars, the result however is an extremely bright image with high contrast. During my test I found that the colours you get when looking at objects like bright flowers and birds were simply stunning, almost better than real life. This effect cannot be duplicated by a normal achromatic lens and you can see the difference when comparing them with binoculars without this technology side by side.

Schmidt-Pechan prism
As with any binocular in this price range you would expect them to have BAK-4 prisms that are made of superior optical glass to produce clearer images, but Kowa have gone one step further in that they use the Schmidt-Pechan prism design that have both BaK4 and SK15 prisms. This prism design, like roof prisms is more compact than a porro prism binocular, but does have a few drawbacks one of which that the two prisms separated by an air-gap and one surface of the Pechan prism does not provide total reflection. To get around this Kowa have added their own highly reflective multi-coating that they call C3 coating that they say give a reflectance of 99% or more across the entire visible spectrum. On top of this Kowa phase coat the prism that prevents the loss of contrast and resolution.

44mm Objective Lenses
The larger 44mm objective lenses are said to be 10% brighter than 42mm versions which I can't verify, but if true is impressive, making them work even better in poor light conditions and you hardly notice the difference in size when holding them.

Field of View
The field of view at 1000 yards is 323.7ft (108m@1000m) is good and is comparable to most top end roof prism binoculars that only have a 10x magnification. They have a close focus distance of 5.5 feet (1.7m) which is excellent and beats most other binoculars in their class.

The Body

The body of the binoculars is made from magnesium alloy and covered in a rubberised armour that give you a tough binocular that should easily handle most conditions that you throw at them. On top of this they are completely sealed and filled with dry nitrogen gas to prevent them from fogging up and mean that they are 100% waterproof. Although if you read the small print they are not intended for underwater use!

Weight
One of the small criticisms of the Genesis XD44 binoculars and even though Kowa have used a Magnesium alloy body that they say "decreases the weight of the binocular", at 34.0 ounces (965g ) they are one of the heaviest full size binoculars that I have reviewed and I think it is one of the reasons they have since brought out the Genesis XD33 binoculars which weigh in at a lightweight 20.8oz (590g). To be honest at first I did not notice the extra weight which I think is a testament to just how comfortable and well balanced they are to hold and in some ways it makes you feel that you really have a solid quality binocular in your hands, but I would imagine that they could start to feel heavy during long periods of observation if you do not have something to rest your elbows on.

Weights of Similar Size Binoculars:

• Kowa Prominar 10.5x44 Genesis XD - 34.0oz (965g )
• Kowa 10x33 Genesis XD - 20.8oz (590g)
• Minox 10x42 BV - 27.5oz (780g)
• Olympus 10x42 Magellan - 23.3oz (661g)
• Bushnell 10x42 NatureView - 23oz (652g)
• Leica 10x42 Ultravid HD - 26.5oz (751g)
• Zeiss 10x42 Victory FL - 26.8oz (760g)

Focusing was really smooth with the large centrally located focusing knob and the comfortable twist up eye-cups provide you with a good 16mm of eye-relief, which means that they just miss out on my own personal benchmark of "Long Eye Relief binoculars", but should be plenty enough for most eyeglass wearers. The lockable diopter control is a nice touch that will keep your setting from accidentally being changed. Another nice touch are threaded objective lenses that allow you to add 46mm filters to the front of the lens.

The Objective Lens covers are attached to the body of the binoculars via a rubber ring that fits tightly around the barrel and definitely will not be lost accidentally, whilst you can remove them should you wish. Overall a great solution and much better than having them loose where you can easily loose them.

Conclusion

Overall these are a fantastic pair of binoculars, ideal for nature observation. perfect safari binoculars and make great bird watching binoculars and would work well as general use and sports optics. The quality of the optics mean that the view through them is nothing short of sensational and definitely some of the best that I have ever used. The feel of the binocular in your hands is nice and balanced and the rubber coating is very comfortable to hold. On the down side, they are a little on the heavy side and if you feel that this is an issue, I would take a look at the new Genesis XD33 binoculars and the Kowa 8x33 Genesis XD Binoculars in particular. For comparison the image at the botom of this page shows the difference in size between the Genesis XD44 binoculars and the XD33's.

Acknowledgement
I would like to thank PYSER-SGI Limited, the UK distributors of Kowa Binoculars for providing me with the Kowa Genesis XD Binoculars to review.

Main Specifications:

• Magnification: 10.5x
• [explain objective lens]Objective Lens Diameter: 44mm
• [explain exit pupil]Exit Pupil: 4.2
• [explain twilight factor]Twilight Factor: 21.49
• [explain eye relief]Eye Relief: 16mm
• Size: Full Size Binoculars
• Weight: 34ozs (964g)
• Length: 6.5in (16.5cm)
• Height: 2.5in (6.4cm)
• Width: 5.4in (13.7cm)
• [explain prism types]Prism Type: Roof Prism Binoculars
• [explain field of view]Field of View: 324ft at 1,000 yards
• Close Focus Distance: 5.5ft
• Waterproof: Yes
• Image Stabilization: No
• Auto Focus: No

More Images of the Kowa Binoculars