How to Choose Binoculars for Birdwatching in the UK
Bramwell Views
The right binocular for birdwatching depends less on price than on where you watch and what you will carry. A pair that is perfect on an estuary can be frustrating in a wood, and a pair you leave at home because it is heavy is no use at all. This guide takes you through the choices in the order that matters.
1. Start with where you watch
| Where you watch most | What helps | Usual size |
|---|---|---|
| Garden and park | Close focus, a wide view, easy handling | 8x42 or 8x32 |
| Woodland and hedgerow | Wide view, good low light, fast focusing | 8x42 |
| Wetland, reservoir, estuary | Detail at distance | 10x42, plus a scope for waders |
| Coast, moor and hill | Detail at distance, weather sealing, a comfortable carry | 10x42 |
| Travel and walking light | Low weight and small size | 8x32 or a compact |
If you split your time, choose for the place where a poor view costs you the most sightings.
2. Magnification and lens size
8x and 10x are the sensible range for handheld birding. Above 10x, hand shake starts to eat the extra detail. Objective lenses of 42 mm are the all-round standard: bright enough for early mornings and grey days without being bulky. 32 mm models are lighter and smaller but dimmer in poor light. Compacts such as 8x25 or 10x25 fit a pocket, but their small exit pupil (around 3 mm or less) makes them hard work in woodland shade and at dusk.
For the detail on the two most popular sizes, read 8x42 vs 10x42 binoculars.
3. Roof prism or porro prism
Roof prism binoculars have straight barrels. They are more compact, easier to seal against weather, and they are what most birders carry today. Porro prism binoculars have the offset, zig-zag shape. At a low price they can give a very good image, but they are bulkier and harder to make weatherproof.
Whichever design you choose, look for BAK4 prisms, a denser glass that transmits light more evenly than the cheaper BK7.
4. Glass and coatings
ED glass (extra-low dispersion) reduces colour fringing, the purple or green edge you can see around a dark bird against a bright sky. It sharpens the look of the image, especially at the edges of a high-contrast view. It also adds cost.
Coatings cut reflections inside the binocular so more light reaches your eye. “Fully multi-coated” means every air-to-glass surface has several layers of coating, which is the level to look for. Be wary of any listing that uses the phrase without saying what is coated.
A note on our own binocular: it uses BAK4 roof prisms and non-ED objectives, and our supplier's specification does not state the coating level, so we do not claim one. We would rather give you fewer claims you can rely on.
5. Close focus
Close focus is the nearest distance at which the binocular will give you a sharp image. It matters for garden birds, butterflies and dragonflies. Many binoculars made for birding focus to around 2 m or closer. Our 10x42 rangefinder binocular focuses from 3 m, which is fine for most birding but not ideal for insects at your feet.
6. Eye relief if you wear glasses
Eye relief is how far behind the eyepiece your eye can be and still see the full view. Glasses push your eye back, so wearers need more of it: around 15 mm or more is the usual starting point. Twist the eyecups down when wearing glasses and up when not. Ours has 15.1 mm.
7. Field of view
A wider field of view makes birds easier to find and follow. It is usually given in degrees, or as the width of the view at 1000 m. Compare like with like: the same magnification, the same units.
8. Weight and how you carry it
Most full-size 42 mm roof prism binoculars weigh roughly 600 g to 900 g. A neck strap is fine for an hour. For a full day, a chest harness takes the weight off your neck and stops the binocular swinging when you climb a stile.
9. Weather sealing
British birding means rain. Look for a stated protection rating, such as IP65, or a clear waterproof specification, rather than the word “weatherproof” on its own. IP65 means sealed against dust and against water jets, so steady rain is no problem. It does not mean the binocular can go underwater. If a maker also states nitrogen or argon purging, that is aimed at preventing internal fogging.
10. Set them up properly on day one
- Width: fold the barrels until you see one clean circle, not two.
- Eyecups: up for bare eyes, down for glasses.
- Left eye: close your right eye and focus on a detailed target with the centre wheel.
- Right eye: close your left eye and turn the dioptre ring, usually on the right eyepiece, until the image is sharp. Do not touch the centre wheel.
- Note the setting so you can reset it if it gets knocked.
From then on, focus with the centre wheel only.
A simple buying checklist
- 8x or 10x, chosen for where you watch
- 42 mm objectives unless weight is the priority
- Roof prisms, BAK4 glass
- Close focus that suits your subjects
- Enough eye relief if you wear glasses
- A stated weather rating
- A weight you will carry every time you go out
Browse our binoculars, or if your birds are usually too far away even for 10x, read spotting scope vs binoculars.
