Bi-focal LED Magnifier

£ 9,20
( excl. Shipping costs)

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Product No.: ZM60xxLx

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Description
Biconvex Lens

This magnifier is bi-focal (two lenses):

In its very large 90 mm lens it has a smaller 21 mm lens incorporated for the higher 4x magnification. The two LED lights round it off.

magnification/lens diametre
2x 90 mm/4x 21mm
3x 70 mm/8x 19mm
3x 75 mm/10x 17mm
biconvex lens
two LED lamps
weight approx. 90 grams

The lens used in this Magnifier:
Aberrations such as coma, distortion, and chromatic aberration almost exactly cancel out also due to the symmetry.

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 lenght 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.

Please Choose:
	3x Ø 65 mm Biconvex Art.Nr.: ZM6065LB
	3x Ø 75 mm, Silver, Biconvex Art.Nr.: ZM6075L	+£ 1,50
	3x Ø 75 mm, Black, Biconvex Art.Nr.: ZM6075LB	+£ 1,50
	2.5x Ø 90 mm Biconvex Art.Nr.: ZM6090LB	+£ 3,00