Other features and highlights of the JK-042 and the JK-842 8x42mm binoculars are that they have been fully sealed to make them waterproof. On top of this, the inside air has been replaced with nitrogen, which will help stop any internal fogging of the lenses. They both feature a roof prism design using quality BaK-4 glass and come with optics that have been fully multi-coated. Their coatings, quality glass help to take and transmit as much of the gathered light as possible to your eyes, which can rally help and is indeed most noticable when lighting conditions are not great or even poor. So as you can clearly see with the comparison table below, these Carson binoculars do well within their price range,although it would have been even better if they could have managed to have added phase correction coatings to the prism which would just raise the image definition just that little bit more and take them up above the crowd in this price range. All you need to do is remove the dust cap on the front hinge by unscrewing it. Then you can simply screw in a standard binocular tripod adapter. The 8x42 Carson RD has an angle of view of 7.1° or, to put it another way the width of the view that you see at 1000 yards away is 371ft wide.

A cookie set by YouTube to measure bandwidth that determines whether the user gets the new or old player interface. All Carson RD Series binoculars come with their "No-Fault Warranty" and whilst they don't stipulate a time frame, I assume it is a lifetime? These Carson binoculars use roof prisms made from BaK-4 glass to correct image gets inverted as it passes through the system. The two thin hinges that span the barrels on the Carson RD 8x42 binocular look to be made from an some sort of metal ally, but most importantly they look and feel very robust and thus should keep the two barrels in perfect alignment, unless you were extremely rough on them!The case comes with it's own detachable shoulder strap and it also has a very comfortable hand strap that I really like. All the 3D Series binoculars are 100% waterproof and nitrogen purged meaning that the internal air has been replaced with dry nitrogen to ensure there is no internal fogging in areas of high humidity or rapid temperature changes. This cookie, set by YouTube, registers a unique ID to store data on what videos from YouTube the user has seen. As I mentioned in the optical performance section and I think is something that follows through to the binocular as a whole:

The dimensions of the Carson RD-842, with the eye-cups twisted in and the hinge fully open is as you can see from the table above very regular for a 42mm binocular. At 9.8ft, the minimum close focus distance for an 8x42 binocular is good, but not excellent (6ft or under). Carson don't state the 'official' IPD range on these, but I measured it to be from a minimum of 5.8cm up to 7.7cm which is fairly typical for a 42mm roof prism binocular. The level of blurring right at the edge of the view was minimal and no more or less than what I would expect to find at this level. Excellent Focus Wheel - Looks great, silky smooth operation, well positioned, nice and large and plenty of gripThe hinges on my sample opened and closed perfectly smoothly and the level of resistance was just right. By this I mean it was not too hard to open and close, but at the same time would remain at your desired IPD (Inter-Pupillary Distance) setting. Considering that these do not have ED glass lenses which are supposed to reduce the aberrations that cause color fringing, I was impressed to see just how little fringing that I could see through this Carson binocular. This is is a few millimeters less than some, but I feel still offers the lenses and adequate amount of protection, keeping out of the way of light falling rain, dust and from being scratched when placing the instrument down on the barrel ends without the lens covers attached, which you shouldn't do anyway. Prisms All of these are typical, perfectly functional and well within what I would expect to find at this price range. The semi rigid construction not only looks great but certainly improves the level of protection offered to the instrument inside.

Established in 1990, Carson Optical began life in the basement of the founders mother's house in Long Island, where Richard Cameron imported and exported a wide array of products between the US and Japan. The roof prisms on the Carson RD Series binoculars are silver mirror coated which usually means that they have a reflectivity of between 95% to 98%, which is good and whilst not as reflective as dielectric coatings, at this price this is about as good as it gets.# and much better than some at this level that will have aluminium mirror coatings. The 17mm of eye-relief is good and whilst not quite enough (18mm) to make it onto my list of binoculars with long eye-relief, it should still be more than enough for almost all users who wear glasses to get the full view. Standard cleaning cloth - good for very light use. For deep cleaning of the lenses I suggest a lens cleaning kit. Carson market the JK Series as ideal everyday, birdwatching, hiking, huning or general widlife observation binoculars.There are a few benefits to this, including making it easier to align your eyes to the lenses and potentially you can get a higher image resolution. This is because at any position other than fully extended or retracted, if you apply a reasonable (but not excessive) amount of force, they begin to twist down. So whilst this is not ideal, for most users, I don't seeing it being more than a minor point that I needed to bring to your attention. Carson Optical currently offer a wide range of binoculars suitable for most uses including travel, bird watching, wildlife observation, hiking and camping as well as hunting, sporting events. The binoculars are grouped into a "Series" covering a wide range of price points and vary in the quality of their optics, coatings and build quality. Currently their top of the range binoculars are the Carson 3D Series Binoculars.