Solid wood - wood grain, wood ray (if it is usually "needle" clearly visible, more or less should have some natural enamel (wood knot, wood patch, etc., black line, etc.) the same piece of solid wood, whether it is wood or wood Article, the grain of the two interfaces should be able to clearly see the natural connection between the longitudinal section and the cross section.
Veneer – wood grain and wood rays are clear. There should also be natural flaws. Because the veneer has a certain thickness (about 0.5 mm), it encounters two adjacent interfaces when making furniture. Usually, it does not turn, but each piece is attached, so the wood grain of the two interfaces should not be connected.
Stickers — Wood grain and wood ray are clearly visible. Even imported high-grade paper can be counterfeited even with wood enamel, but it is different from natural wood veneer. Sticker furniture is easy to reveal flaws at the corners. In addition, the grain paper will be directly wrapped by the two plane junctions with a small thickness (0.08 mm), so that the wood grain of the two interfaces is usually connected to the longitudinal section.
Meniscus Lenses: The Positive Meniscus can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens. The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.
We supply kinds of Plano-Convex Spherical Lens,Plano-Concave Spherical Lens,bi-convex Spherical Lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our optical meniscus spherical lens as follow:
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
Meniscus Spherical Lens,Meniscus Spherical Lenses,Optical Glass Meniscus Lens,Glass Meniscus Lens
China Star Optics Technology Co.,Ltd. , https://www.realpoooptics.com