The NHBS Guide to Hand Lenses

The possession of a hand lens is one of the defining characteristics of a naturalist.

We use them for everything from peering at beetle genitalia and examining floral characters, to examining the arrangement of teeth in small mammal jaw bones. There are a wide variety of hand lenses on the market so how do you decide which lens is best for you? This article contains all the information you need to make an informed choice.

Glass versus plastic lens?

The optical lens in a hand lens can be made from glass or plastic. Plastic lenses are generally more affordable and lighter but are of lower optical quality and are more difficult to clean. Plastic hand lenses, however, can be a good choice for schools and young children.

How many optical elements?

Canon 400mm

An element is an individual piece of glass within a lens. When you look through a high quality camera lens you will typically be viewing what’s in front of the lens through four to six lens elements, as well as other elements used for focusing and zooming (see image below right).

Paul Canon EF 400mm f/4 DO IS USM By Paul Chin

Hand lenses are constructed with one (singlet), two (doublet) or three (triplet) lens elements. Each one is specially shaped to correct for a particular type of optical distortion, so the more elements, the higher quality the image.

Magnification

A 10x magnification hand lens will be more than adequate for most purposes. Higher magnification lenses tend to be harder to use but are very useful for viewing extremely small objects. If you are unsure of which magnification you need, or think you may need several different lenses, you might consider the Duel Singlet Loupe (x10 and x20) or the Triple Hand Lens (x3, x4 and x5).

Lens diameter

Large diameter lenses provide a wider field of view which means that they are easier to use but they are slightly more expensive to produce.

How hand leOpticron Hand lens, 23mm, 10x magnificationnses are named

Hand lenses are named in the same way as binoculars, with both the lens diameter and the magnification included in the name. For example, the Opticron Hand lens, 23mm, 10x magnification has a 23mm diameter lens and provides 10x magnification.

Using your hand lens

Finally, a quick note on hand lens technique. To use your hand lens correctly, hold the lens close to your eye and then either a) move the subject closer to your eye until it comes in to focus or b) move your head (and the hand lens) closer to the subject until it comes into focus. It’s easy with a little practice so don’t get put off if you find a new hand lens difficult at first. Expect to get close up to what you’re examining – it’s quite common to see naturalists crawling around on the ground to get close to a plant they’re identifying.

Keeping your hand lens safe

It can be very hard to find a much-loved hand lens dropped in long grass or woodland. To prevent this happening, we recommend a lanyard for your hand lens – this has two functions: a) if you have it round your neck you won’t drop it, and b) if you put it down somewhere the bright blue lanyard is easy to spot.

The table below provides a guide to the hand lenses sold by NHBS. More information and specifications of each can be found by following the links. Our full range of lenses and magnifiers can be found at nhbs.com.

NameTypeMagnificationLens Diameter
Singlet Loupe Hand LensSinglet10x21mm
Duel Singlet LoupeSinglet10x/20x18mm/12mm
Opticron Hand Lens 18mm 6xDoublet6x18mm
Opticron Hand Lens 23mm 6xDoublet6x23mm
Hilkinson Ruper Hand Lens 25mm 6xDoublet6x25mm
Hilkinson Ruper Hand Lens 20mm 8xDoublet8x20mm
Hilkinson Ruper Hand Lens 25mm 8xDoublet8x25mm
Hilkinson Ruper Hand Lens 12mm 10xDoublet10x12mm
Opticron Hand Lens 18mm 10xDoublet10x18mm
Hilkinson Ruper Hand Lens 20mm 10xDoublet10x20mm
Doublet Loupe Hand Lens, 23mm, 10xDoublet10x23mm
Opticron Hand Lens 23mm 10xDoublet10x23mm
Opticron Hand Lens 18mm 15xDoublet15x18mm
Doublet Loupe Hand Lens, 23mm, 15xDoublet15x23mm
Opticron Hand Lens 23mm 15xDoublet15x23mm
Hilkinson Ruper Hand Lens 12mm 16xDoublet16x12mm
Hilkinson Ruper Double Hand Lens 8/15xDoublet8x/15x25mm/12mm
Hilkinson Ruper Double Hand Lens 10/20xDoublet10x/20x18mm/6mm
Hilkinson Ruper Triple Hand LensDoublet3x/4x/5x20mm
Belomo Triplet Loupe Hand LensTriplet10x20mm
Triplet Loupe Hand Lens, 21mm 10xTriplet10x21mm
LED Triplet Loupe Hand Lens 10x 21mmTriplet10x21mm
Triplet Loupe Hand Lens, 21mm 20xTriplet20x21mm
LED Triplet Loupe Hand Lens 20x 21mmTriplet20x21mm

 

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