I think this is comfort is enhanced by the fact that they have a very comfortable really sort and flexible nose piece that looks to be made from a kind of silicone/ rubber material.

Pair of telescopes mounted side-by-side 8×42 roof prism binoculars with rainguard and opened tethered lens capsIf you are not concerned by the slightly strange appearance of wearing them, then these are truly a super pair of binoculars for their main intended use as theater and opera glasses:

So to see just how good they actually are and indeed what their ideal uses will be, please take some time to read my full review of the Kabuki Glasses by SantePlus: In aprismatic binoculars with Keplerian optics (which were sometimes called "twin telescopes"), each tube has one or two additional lenses ( relay lens) between the objective and the eyepiece. These lenses are used to erect the image. The binoculars with erecting lenses had a serious disadvantage: they are too long. Such binoculars were popular in the 1800s (for example, G.& S. Merz models). The Keplerian "twin telescopes" binoculars were optically and mechanically hard to manufacture, but it took until the 1890s to supersede them with better prism-based technology. [3] [4] Prism [ edit ] In the early 2020s, the commercial offering of Schmidt-Pechan designs exceeds the Abbe-Koenig design offerings and had become the dominant optical design compared to other prism-type designs. [20]

Compared to most standard binoculars and especially most normal opera glasses, this is a huge difference and which for me is one of the main and critical advantages these have over them. The ocular lenses have the same diameter of 13mm as the objective lenses, which is bigger than most standard opera glasses and comparable to many normal compact binoculars. Binocular eyepieces usually consist of three or more lens elements in two or more groups. The lens furthest from the viewer's eye is called the field lens or objective lens and that closest to the eye the eye lens or ocular lens. The most common Kellner configuration is that invented in 1849 by Carl Kellner. In this arrangement, the eye lens is a plano-concave/ double convex achromatic doublet (the flat part of the former facing the eye) and the field lens is a double-convex singlet. A reversed Kellner eyepiece was developed in 1975 and in it the field lens is a double concave/ double convex achromatic doublet and the eye lens is a double convex singlet. The reverse Kellner provides 50% more eye relief and works better with small focal ratios as well as having a slightly wider field. [35]

External focusing, which focuses binoculars by moving the eyepieces, where the volume of the binoculars always changes. During this process, external air and also small dust particles and moisture can be drawn into or pressed out of the binoculars. It is hard to seal or waterproof such systems and in case the eyepieces are moved by a central focuser shaft and external eyepiece arms bridge construction, this construction can (accidentally) get bent/deformed that can result in disabling misalignment. However even though many operas, ballets and shows take place at night, you are looking at a brightly lit stage and so there is far more light concentrated and being directed to your eyes than if you are simply looking around normally in the evening and thus this should not be an issue.Since the Keplerian configuration produces an inverted image, different methods are used to turn the image the right way up. The Trinovid is also well-suited to the field. The 7-power magnification gives the mid-sized binocular a pleasing field of view and decent range. The 35mm objective fits nicely between the 32mm compacts and the 42mm full-sized units, giving the Leica points for portability and versatility. The leather appointments give the binocular great grip, and the centered focus wheel is easy to operate with a single hand. What makes the BX-4 Range worth including in this review of essential binoculars is that it brings excellent optics, solid durability, and smart functionality to the category. The LRF bino is an impressive confluence of the brand’s far-ranging talents with both field optics and rangefinding electronics. The BX-4 Range binocular borrows from Leupold’s software that combines its long line of laser rangefinding monoculars with very good binocular optics. In roof prism designs, optically relevant prism angles must be correct within 2 arcseconds ( 1 / 1,800 of 1 degree) to avoid seeing an obstructive double image. Maintaining such tight production tolerances for the alignment of their optical elements by laser or interference (collimation) at an affordable price point is challenging. To avoid the need for later re-collimation, the prisms are generally aligned at the factory and then permanently fixed to a metal plate. [17] These complicating production requirements make high-quality roof prism binoculars more costly to produce than Porro prism binoculars of equivalent optical quality and until phase correction coatings were invented in 1988 Porro prism binoculars optically offered superior resolution and contrast to non-phase corrected roof prism binoculars. [16] [17] [18] [19] An improved image and higher magnification are achieved in binoculars employing Keplerian optics, where the image formed by the objective lens is viewed through a positive eyepiece lens (ocular).

Although different prism systems have optical design-induced advantages and disadvantages when compared, due to technological progress in fields like optical coatings, optical glass manufacturing, etcetera, differences in the early 2020s in high-quality binoculars practically became irrelevant. At high-quality price points, similar optical performance can be achieved with every commonly applied optical system. This was 20–30 years earlier not possible, as occurring optical disadvantages and problems could at that time not be technically mitigated to practical irrelevancy. Relevant differences in optical performance in the sub-high-quality price categories can still be observed with roof prism-type binoculars today because well-executed technical problem mitigation measures and narrow manufacturing tolerances remain difficult and cost-intensive. Since then he tells me that not only are they ideal theater and opera glasses, but he also has customers who use them for watching sporting events and have even taken them on safari! If you also consider that because most standard opera glasses use the Galilean design, this means that their effective width of view is even less than stated because this design means that they have a large area around the edges of the view that is blurry and out of focus. The fact that there’s nothing jaw-dropping to say about this quietly serviceable binocular actually says volumes. It’s not trying to be the next super-optic, or to connect to your smartphone or your smarter refrigerator. Instead, this is a capable, dependable binocular that’s built around a very good class of glass and has some very appealing controls, from the precise focus knob to the best eyecups in the class. Reticle scale: a navigational aid which uses a horizon line and a vertical scale for measuring the distance of objects of known width or height – sometimes an important navigational aid.I’d give this a hard look as a kids’ binocular, or an optic for a first-time hunter,” noted tester Ky Idler. “It is solid. It’s decent. But it’s not particularly impressive.” I tested the Kabuki Glasses on my 6 year old daughter and whilst she had become pretty good at using "dads binoculars", there was an immediate and obvious improvement with these. She no longer had the fidgety hands problem shared by most kids and once I had set the IPD correctly to match her narrower eyes, she had no problem in aiming, finding and following objects.