Shooting through fences and glass: techniques for clean photos

The jet taxis past in perfect light, the registration is legible, the focus is sharp – and across the fuselage lies a gray diamond pattern. Or a reflection of your own face, because you were standing on the terrace behind a glass balustrade. Fences and glass are the two obstacles almost every spotter deals with regularly. The good news: physics lets you outsmart both fairly reliably. This guide explains how to shoot through fences and glass panes without the picture giving it away – and when you are better off changing position.

The short answer

With a fence, the rule is: lens as close to the mesh as possible, aperture wide open, long focal length, aircraft as far behind as possible. Then the wire gets so blurred that it spreads across the whole lens surface and costs only some contrast. With glass, the rule is: shoot head-on, hood against the pane, shade everything bright on your side. Reflections do not originate in the glass but in light falling on it from your side – take that away and the pane is almost invisible.

Why a fence can disappear at all

Many people think a fence in front of the lens inevitably ends up in the picture. Optically, that is not the case. Every point of your subject is imaged through the entire opening of the lens, not just through one small spot in the middle. If a thin wire sits right in front of the lens, it blocks only part of that opening. The light from the aircraft still arrives through the rest of the opening – the image does not turn black at that spot, just slightly darker and flatter.

The key quantity is the entrance pupil, the effective diameter of the aperture opening seen from the front. You calculate it roughly as focal length divided by f-number. Three rules follow:

• Long focal length helps: 400 mm at f/5.6 gives about 71 mm of pupil, 200 mm at f/5.6 only about 36 mm. With the long telephoto, a wire is much thinner in proportion.
• Wide-open aperture helps: Stopping down to f/11 halves the pupil diameter – and suddenly the mesh shows up again as a gray pattern.
• Distance from the fence hurts: The farther the lens is from the mesh, the smaller the blur of the wire becomes, and the more likely it is to show as a structure. Stepping back half a meter can ruin the entire picture.

Then there is the subject: the farther the aircraft is behind the fence, the more the planes of focus differ, and the more cleanly the camera separates fence and subject. A jet on the runway several hundred meters away is ideal; a small plane two meters behind the mesh is a problem. Which focal lengths are typical at which spots is explained in the guide The right lens for plane spotting.

Fence technique step by step

In practice, the order matters. If you set up the camera first and look for a spot afterward, you waste time while the plane is already taxiing.

Sun on the fence: the underrated contrast killer

A shiny wire lit by the sun scatters light into the lens – the picture then looks as if shot through frosted glass. If the sun is at the side, a fence section in the shadow of a post or tree can already help. The lens hood also does more here than usual, because it keeps side light off the wire right in front of the lens. As a general rule, a dark-coated fence bothers you less than bare, galvanized metal. How to get the sun behind you at the planned time is shown in the guide Planning sun position; shooting into the light through a fence is the hardest of all combinations – more in Backlight in aircraft photography.

If the fence is so dense that no technique helps, height is the best alternative: a permitted ladder gets you above the mesh, and a spotters’ hill or a terrace does so anyway. Why many spotters head out with a ladder for exactly this reason is described in The ladder as a spotter’s tool. The fence part is also covered in more depth in the guide Shooting through the fence.

Glass: where reflections come from

With glass, the problem is a different one. The pane itself is largely transparent, but every glass surface reflects part of the light. At perpendicular incidence, that is only about four percent per surface for ordinary glass – that sounds like little, but it is enough to bring a brightly lit jacket, a ceiling lamp or the sky behind you visibly into the picture. At an oblique angle, the reflected share grows significantly.

The most important insight follows: A reflection needs something bright on your side of the pane. If it is dark behind you, practically nothing is reflected. That is why photos from dark rooms onto a bright apron often look surprisingly clear, while the same pane turns into a mirror when backlit from inside the terminal.

Glass situation	Typical problem	Remedy
Terminal windows, multi-pane glazing	offset double reflections, loss of contrast	shoot head-on, press a rubber hood on, shade the interior light
Glass balustrade on the observation deck	sky and people reflected, fingerprints	lens right against the glass, find a clean spot, shoot over the balustrade where allowed
Tinted or coated glass	color cast, often greenish or bluish	RAW, white balance on a neutral surface, correction in editing
Glass in direct sun	haze, dust and streaks become visible	pick a spot in the shade, stay head-on, keep the aperture open

Glass technique step by step

• Rubber lens hood against the pane: A soft, collapsible rubber hood can be pressed right against the glass and seals the lens all around. No side light, no reflection. If you do not have one, a hand, a dark scarf or a jacket around the lens will do.
• Stay head-on: The more perpendicular you shoot through the pane, the less it reflects and the smaller the optical distortion from the glass. If you swing strongly to an angle, image quality visibly drops.
• Dress dark: Light clothing is reflected first. A dark top is actually a piece of equipment on terraces behind glass.
• Flash off: A built-in flash always produces a bright spot through glass. For aircraft at a distance it does nothing anyway.
• Force the focus onto the aircraft: Scratches, drops or dust on the pane attract the autofocus. A small focus area or manual pre-focusing helps.
• Use a wide-open aperture: As with the fence: the larger the opening, the less dirt and scratches on the pane show.

Does a polarizer help?

The polarizer is the first accessory many people think of for reflections. It works, but only under certain conditions. Light reflected from glass is more strongly polarized the closer the viewing angle is to the so-called Brewster angle – for glass, that is about 56 degrees from the perpendicular. There, a polarizer can wipe out reflections almost completely. If you look straight through the pane instead, the reflected light is hardly polarized, and the filter does little.

For most situations at the airport, the rubber hood is the better choice because it works without any loss of light. When a polarizer is still worth it is covered in the article Polarizers and other filters in aircraft photography.

Rescuing color, contrast and sharpness

Even with perfect technique, glass is not without consequences. Tinted or coated panes, as often installed in terminals for heat protection, shift the colors. So shoot in RAW (background in RAW or JPEG for plane spotting?): Then you can correct the white balance afterward on a neutral surface – such as a white fuselage or gray asphalt – without losing quality.

You bring contrast back with a gentle tone correction and a dehaze slider. Do not overdo it: aircraft photos through glass quickly look over-processed when the sky is suddenly darker than in reality. And sharpen sparingly – glass and fence cost fine micro-contrast that no sharpening can fully bring back.

A common side effect is heat shimmer. It gets warm behind panes in the sun, and the air shimmers over the asphalt outside. That is not a glass defect but a weather issue; how to deal with it is explained in Avoiding heat shimmer.

Fence, glass or better to move?

Not every obstacle is worth the fight. Sometimes a change of position is faster than any technique.

Whether a spot offers mesh, glass or a clear view is shown by spot profiles and community photos, for example for the Hamburg observation deck, the Düsseldorf observation deck or Spectator Terrace B in Zurich. If you are waiting at a terminal window, by the way, you can take the glass tips over almost one to one – what is allowed there is covered in Photography in the terminal; photographing on board has its own additional rules, explained in the guide Photographing from the airplane window.

What to watch out for

• Protect the front element: At the fence, metal quickly rubs on glass. A lens hood as a spacer protects the lens; a protective filter is an option but can create reflections itself.
• Do not knock on the glass: If you set the lens on a pane, you transmit vibrations from footsteps or doors. Set it on lightly instead of pressing.
• Be considerate of others: On crowded terraces, the spot at the clean part of the pane is in demand. Taking turns is part of it – more on the etiquette in Proper behavior at the airport fence.
• What the operator allows is what is allowed: Signs on terraces and at fences apply. An overview of the legal situation is given in Is plane spotting allowed?.
• Bring a cleaning cloth: Fingerprints on your side of the glass balustrade you can often wipe off yourself – on the outside, unfortunately not.

Conclusion

Fences and glass are not knockout criteria but solvable optics problems. With the fence, you work with blur: lens close to the mesh, large opening, long focal length, subject far behind. With glass, you work with light: shoot head-on, shade, nothing bright behind you. If neither is enough, a change of position is not a failure but often the fastest solution. And which camera is particularly well suited for such situations is revealed in the comparison The best camera for plane spotting.