How to protect your camera from salt spray and sand

Why the coast is so hard on your kit

There is nothing quite like a blustery morning on the Pembrokeshire coast or a slow afternoon on the Norfolk sands. The light is extraordinary, the air smells of seaweed and ozone, and your camera is quietly being sandblasted and salted. Coastal photography is a joy, but it is also the most demanding environment most of us will ever shoot in.

Salt spray is the real villain. Those fine, invisible droplets settle on lens elements, filter threads and camera seams, and as the water evaporates it leaves behind microscopic salt crystals. These crystals are abrasive, hygroscopic (they pull moisture out of the air) and mildly corrosive to metal. Sand is the blunt instrument: a single grain trapped between a zoom barrel and its housing can grind away for months. Add wind, damp and rapid temperature changes, and you have a recipe for fungus, seized controls and a very expensive repair bill.

The good news is that a small, cheap kit and a few habits will keep your equipment working for years. Here is what works.

Start with a protective filter

A good multi-coated UV or clear filter is the single best investment for coastal work. It costs a fraction of a lens, and it takes the hit so your front element does not.

Buy a filter with a hard, water-repellent coating that lets spray bead up and roll off rather than smearing. Look for brass rather than aluminium filter rings if you can — brass does not gall or seize when it corrodes, which matters enormously when you are trying to remove a filter with salty fingers.

Two practical points that catch people out:

• Take the filter off before you clean it. Cleaning in situ just pushes salt into the thread, where it dries into a cement-like crust. Unscrew it, clean both surfaces properly, then refit.
• Do not use a cheap filter in bad weather. A poorly coated filter will flare horribly against bright sea light and can be harder to clean than the lens beneath it.

If you shoot with a compact or a phone, a simple stick-on screen protector and a clear case do the same job. Do not underestimate what a wipe-down with a clean microfibre cloth achieves either — it is the cheapest piece of coastal kit you own.

Silica gel packs: the quiet workhorse

Damp is more insidious than direct spray. Sea air carries a fine mist that finds its way into camera bags, lens barrels and battery compartments, and it lingers. Leave a lens in a closed, humid bag for a week and you are inviting fungal growth between the elements — a problem that is often invisible until it has etched the coating.

Rechargeable silica gel packs are the answer. The old sachets that come in shoeboxes are fine for a day trip but saturate quickly; the reusable kind, often with colour-changing indicator beads, can be dried out on a radiator or in an oven and used again and again.

• Use two per bag — one in the main compartment, one in the lid pocket where condensation gathers.
• Dry them out after every coastal trip. Orange or pink beads mean they are spent; once they turn back to blue or clear they are ready to work again.
• Add a small pack to your lens case if you carry one separately, especially for older manual-focus glass with looser tolerances.

A surprising amount of coastal damage happens after you get home, when a cold camera is brought into a warm, humid house and condensation forms inside the body. Let your kit come up to room temperature inside its bag before you open it. It feels fussy; it saves sensors.

Choose a dry bag you will actually carry

A dry bag is not just for kayakers. For coastal walking, a roll-top dry bag of 10 to 20 litres is the most reliable protection going, and it doubles as a seat, a pillow or a place to stash a wet jacket.

Look for a bag with welded seams rather than stitched ones, and a roll-top closure you can fold down at least three times. A simple clip buckle is fine; you do not need a waterproof zip that will clog with sand. Test it at home by sealing it with a tissue inside and submerging it in the bath for a minute. If the tissue stays dry, you are good.

Inside the dry bag, keep a small microfibre cloth in a zip-lock bag, a soft brush for sand, and a spare silica pack. That little dry-bag ecosystem is your field repair kit.

For actual walking, a padded insert inside the dry bag gives you a bit of drop protection, and a shoulder strap or harness keeps your hands free on scrambly sections like the South West Coast Path. If you are shooting regularly in sea mist, consider a rain cover for the camera itself — the cheap elasticated kind works perfectly well.

Field habits that save equipment

Technique matters as much as gear. These habits take seconds and prevent most of the damage I have seen over the years.

• Do not change lenses outdoors. Retreat to a car, a café or a sheltered wall. If you must swap in the field, turn your back to the wind and keep the body face-down.
• Zoom gently. Extending a zoom barrel pumps air — and sand — into the lens. Wipe the barrel with a dry cloth before you zoom if it has been exposed.
• Use a lens hood. It shields the front element from spray and stray light, and it is a sacrificial bumper if you slip on wet rock.
• Rinse, do not scrub. At the end of the day, wipe the body with a cloth barely dampened with fresh water, then dry immediately. Never let salt sit overnight.
• Keep a dry towel in the car. Hand dry, camera dry, then pack away.

Finally, keep your kit out of the sun. A camera left on a hot dashboard with a damp body inside is a condensation chamber. Shade, a cool bag, or simply carrying your gear with you will do more good than any accessory.

After the walk: the twenty-minute routine

Back home, unpack properly rather than dumping everything in a cupboard. Remove the filter and clean it separately. Brush loose sand from the body with a soft brush, then wipe with a fresh-water-dampened cloth. Dry the lens mount and battery compartment. Recharge or replace your silica packs. Leave the dry bag open to air, inside out, so it does not grow mildew.

Do that and your camera will happily accompany you through years of estuaries, dunes and Atlantic gusts. The coast rewards those who look after their gear — and there is no better feeling than knowing you can keep shooting when the weather turns.