Linen Tester Magnifier - Large Diameter
World Class Optics Made in Germany
This is a high quality 6x magnification folding magnifier. Its high resolution makes it a great tool to work with. The lens gives a sharply defined, crystal clear image.
A high magnification at a low price. Brilliant optics- recommended for work or hobby.
- Magnification: 6x
- Lens Type: biconvexe
- Lens Material: glass
- Lens Diametre: Ø28mm
- Scale Metric: mm, inches
- Scale Length: 20mm / 1 inch
- Scale Graduation: 1mm
- Foot opening: 25x25mm
- Weight: 100g
- Construction: metal
- synthetic leather pouch included
- Dimensions:
Length : 5.20 cm
Width : 3.80 cm
Height : 1.40 cm
The foot-base has a clearly engraved scale. After use or for storage it can be comfortably folded together and kept in its leather pouch (included) for safe storage and transport.
This can be also be used as a promotion gift with the back providing a 33 x 33 mm space for print/advertising.
- Magnification: 6x
- Lens Type: biconvexe
- Lens Material: glass
- Lens Diametre: Ø28mm
- Scale Metric: mm, inches
- Scale Length: 20mm / 1 inch
- Scale Graduation: 1mm
- Foot opening: 25x25mm
- Weight: 100g
- Construction: metal
- Dimensions:
Length : 5.20 cm
Width : 3.80 cm
Height : 1.40 cm
Biconvex lenses are also called convexo-convex lenses and are mainly made out of a special quality glass. Different types of biconvex-lenses exist such as the planconvex-lens. The most common biconvex lens is the symmetric-convex lens as used in this magnifier.
The biconvex lens is manufactured with identical convex surfaces each side of the lens. The focal length is equal to the radius of the curvature. Resulting from its perfect symmetry it produce images close to 1 and up to a magnification of 8x. Biconvex lenses have positive focal lengths and form both real and virtual images.
Aberrations such as coma, distortion, and chromatic aberration almost exactly cancel out also due to the symmetry.