Magnifiers

Headband magnifiers	Clip on magnifier sets for eyeglasses	Watchmaker’s magnifiers	Diamond magnifiers	Linen testers
Linen testers with scale	Folding magnifiers with 2 lenses	Folding magnifiers	Stand magnifiers	Measuring magnifiers with scale
Measuring magnifiers with scale	Measuring magnifiers with scale - precision model	Measuring magnifiers with exchangeable scalesprecision model	Special scales for measuring magnifiers	Pocket microscopes
Reading magnifiers	Grip magnifiers	Stand magnifiers

Lenses, definitions

Fundamentally, the spherical and aspherical lenses are distinguished.

	Spherical lenses have a uniform radius in their curve, which leadto slight distortion of the image in the border area.
	Aspherical lenses have differing curves (no uniform radius) andtherefore have a clearly better image quality in the border area.
	The surfaces of a lens can be convex, flat (plane) or concave. Generally, spherical lenses are used with the following differing lens geometries:
	Plano-convex shape Light collecting effect, one surface is plane and the other iscurved towards the outside.
	Biconvex shape Better image quality and higher magnification than plano-convexlenses. Both surfaces are curved towards the outside.
	Aplanatic shape Sharp edge and distortion-free image. Two plano-convex lensesare arranged together with the curved surfaces.
	Achromatic shape Colour-fast images. Suppresses disturbing colour fringe in theborder area. A plano-concave and a biconvex lens are arrangedone after the other.

Dioptre number, magnification
The dioptre number (D) specifies the refractory property of a lens. The magnification factor (V) is calculated according to the following formula: V = ( D / 4 ) + 1