Pentax AD 9 x 28 WP Roof Prism Binocular

Product Information

here I have a second hand pair of 4207028 firestone radials with about 30% tread , they are in good condition and came off tubeless, sold as pair The complex optical design of roof prism binoculars provide durable, compact, yet lightweight design but require a higher level of optical perfection. A phase-correction coating is applied in the full range of roof prism binoculars to maximize image viewing quality.

Think of the objective lenses like the windows in a house. Large sliding glass doors on your patio are able to capture and let in much more light than a tiny attic window. tires and make sure your new tires will fit properly. Tractor tires use three different formats: Standard, Radial and Metric. Nitrogen is a chemical element and a colourless, odourless and tasteless gas. It contains very little humidity and is therefore used to "purge" binoculars and spotting scopes of the high humidity air that is part of our environment. Due to the low humidity factor, nitrogen prevents condensation from forming on the internal lenses of optical instruments during phases of rapid temperature change. Furthermore, because nitrogen is purged into the optical instrument at slightly above atmospheric pressure, dust and other miniscule particles are prevented from entering the housing. Long eye relief design Below is a table comparing a few of the main specifications of this Pentax binocular with a selection of other roof prism compact binoculars: This sophisticated optical design is critical to low-maintenance and long life guarantee. Exposure to air-bourne particles and moisture is avoided, thereby ensuring that no outside influences can penetrate the housing and disrupt functionality. Nitrogen purgedof 12.5 80 18 continental els tyre, 30 percent tread, the tyre has been major vulcanised repair and is in perfect condition Thus it stands to reason that if you are generally going to be observing objects at longer ranges, a 10x or perhaps even a 12x magnification might be the right option. Although, having said that, there are still many other factors and consequences brought about by the higher power that you still need to take into consideration before making your final choice: Field of View a pair of 12.428 tractor tyres , these tyres are old but will hold air no problem, ideal for little old land tractor or scraper tractor, sold as a pair, sold as seen The eyepiece housing looks to be made from aluminium or something similar and the twist-up eyecups look to be made from a hard plastic, which has 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 17mm, whilst the eyecup has an external diameter of 34mm.

off 99 percent vredestein traxion + tyre, the tyres has had a professionall major repair and is in perfect condition , 1 only GOODYEAR STR RADIAL TRACTOR TYRES PARTWORN IN GOOD CONDITION , FITTED TUBELESS ABOUT 1OMM TREAD 25% SOLD AS A PAIR debica stomil 3rib 8ply tyre,this is a new tyre as fitted to the rear of class+ john deere combinesFully multi-coated lenses serve the essential purpose of maximizing the amount of light passing through a lens, thereby prevent flare and ghosting from interfering with your view. Pentax applies multiple layers of coatings to every surface of every element and prism in the full Sport Optics line-up. These fully-multi-coated optics assure the maximum light transmission resulting in a clear, crisp view of the world. New Enhanced Light Transmission Coatings

On the underside of the body there are two thumb indents in the rubber armor on each barrel, these help by encouraging you to hold the binoculars in the right place, to ensure that they are nicely balanced when holding them up to your eyes. Due to its outstanding refractive index, the BaK4 glass prism found in all Pentax Sport Optics is highly acclaimed for its perfectly round exit pupil and clear, unvignetted image. Phase Correction As well as being waterproof, they have been "nitrogen purged" which means all the internal air has been replaced with dry nitrogen gas which protects them against internal fogging. Fogging can occur when you get rapid temperature changes or in places that have a high humidity level. A secondary benefit of this is it protects the inner workings from corrosion because there is no internal moisture. as new 4456522.5 (18x22.5)Michelin xzy tyre , as new but has had a major vulcanise repair, tyre in perfect usable condition, 1 onlyWhilst these silver mirror coatings are excellent and increase the reflectivity compared to most standard binoculars on the market, some optical manufacturers go even further and use dielectric prism coatings that have a reflectivity of more than 99% - but these are usually only found on binoculars at the very top end of the market. Alliance 40%-50% tread, 8 stud centres (8" 203.5mm pcd 5.75" 150 mm centre hole and the 7.2-7-36 Pirelli 80%-90% tread 8 stud (13" 330 mm pcd michelin xm108 tube type 14mm tread ,tyre will need to be fitted with a tube as the case has a few thorn holes in it In the same way, big lenses are able to capture and potentially transmit more light into the instrument. This increase in light ‘information’ can improve image brightness and quality. Tread depth from casing ( see tread depth calculator) will be given on the worst part of the tyre, also casing condition and if the tyre has had any vulcanise repairs done to them in the past will be given in the description ( we can give no warrantee on any major vulcanise repairs).

As you increase the magnification, the field of view almost always decreases. This makes sense as the higher the power, the more “zoomed in” you are and thus as a consequence, you are able to view less of the bigger picture. In normal daylight conditions most people’s pupils tend to measure around 3mm in diameter, so, in these conditions, exit pupils much larger than 3mm are not really necessary as the extra light does not pass into your eyes. The Pentax AD 9x42 WP binoculars come with objective caps, eyepiece caps, carrying case and a strap.Store your tractor indoors: Exposure to sunlight UV will damage your tire over time and shorten its lifespan. The dimensions (LxWxH) of these 9x28 Pentax binoculars when fully opened are 4.6in (11.7cm) x 4.5in (11.5cm) x 1.7 in (4.4cm), which makes them about average for a roof prism compact. divide the number by 25.4 to get the inches equivalent. To convert from imperial to metric, multiple by 25.4 Tiny lenses (21mm / 22mm) are for those requiring the smallest, most lightweight instrument possible, but be aware this comes at the expense of image brightness and potentially image quality as well. The metric sizes (420/85R28) tell you the PROFILE percentage after the width, here it is 85% profile (this means the side walls on the tyre are 85% as tall as the width of the tyre). This profile can be ignored if your tyre size if written in imperial as it is not given.