How to Photograph a Rainbow: Where to Stand, When They Appear, and Why the Sun Has to Be Behind You

You have probably watched a hundred rainbows and photographed maybe three of them well. The difference is almost never the camera — it is where you were standing and which way you were facing.

A rainbow is not an object sitting out in the landscape. It is a geometric event that exists only for you, at your exact position, with your back to the sun.

Once you understand that one fact, the whole thing turns predictable. You stop hoping a rainbow shows up and start knowing where to look for it.

Why The Sun Has To Be Behind You

Sunlight enters a raindrop, bends, bounces off the back inner wall of the drop, and bends again on the way out. That bounce sends the light back toward the direction it arrived from — toward the sun, and back to your eyes only when the sun is behind you.

This is the whole reason you will never catch a rainbow while facing the sun. The light has to come over your shoulder, strike the rain hanging in front of you, and return.

The bending also does something subtler: each color bends by a slightly different amount, so white sunlight fans out into its spectrum on the way through. That dispersion is why you get separated bands of red, orange, and violet instead of one white arc.

The easiest way to find the center of any rainbow is to look at the shadow of your own head. The bow is always a circle drawn around that exact point, called the antisolar point.

Raise or lower the sun and that shadow moves, and the bow slides with it. Your head's shadow is the bullseye every rainbow is aimed at.

The 42-Degree Rule, And Where It Puts You

Every primary rainbow sits at the same angular distance from that antisolar point: about 42 degrees. Red lands on the outer edge near 42 degrees and violet on the inner edge near 40, and that spread never changes.

Because the angle is locked, the only real variable is how high the sun sits. A low sun pushes the antisolar point higher above the horizon, which lifts the arc into a tall, dramatic semicircle.

A high sun does the opposite, pressing the bow down until most of it falls below the horizon. This is the one lever you actually control — by choosing when to shoot.

When Rainbows Appear — And When They Can't

Most people never connect the next part: if the sun is higher than 42 degrees above the horizon, there is no rainbow to see from the ground. The whole arc has dropped below the horizon line, and you would need a cliff, a plane, or a tall building to look down into it.

In practice that hands you two daily windows — the hours after sunrise and the hours before sunset — when the sun sits low enough for a full, standing arc. It is the same low, raking light that makes golden-hour light worth chasing.

In high summer the midday sun climbs well past 42 degrees, so an afternoon storm rarely throws a visible bow until the sun drops later in the day. In winter the sun stays low from dawn to dusk, and a rainbow can appear at noon.

From a plane or a high ridge, the geometry opens up entirely. With the antisolar point now below your feet, the bow can complete into a full 360-degree circle — the version no one standing on flat ground ever sees.

What Conditions Actually Produce One

A rainbow needs two things at once: direct sun and falling rain, sitting in opposite halves of the sky. Overcast drizzle will not do it, because the sun has to break through cleanly from behind your back.

The most reliable producer is a passing shower — a discrete cell of rain drifting away from you while the sky clears behind your back. Watching that cell move on the weather radar tells you when the gap will open and the sun will catch the back edge of the rain.

Frontal passages and convective afternoons are your best bets, especially when you can see a bright, hard edge to the clouds. The same unstable air that builds photographable lightning often leaves a clean rainbow in the clearing behind it.

You do not even need weather to make one. A waterfall, a garden sprinkler, or sea spray will throw the same 42-degree bow if you put the low sun at your back and look into the mist.

The Double Bow And The Dark Band Between

When a rainbow is bright, look for a second, fainter arc outside it. That secondary bow sits around 51 degrees from the antisolar point and comes from light that reflected twice inside each drop.

The secondary bow's colors run in reverse, with red on the inside facing the primary. Between the two arcs the sky looks noticeably darker, a genuine optical feature worth composing around rather than cropping out.

Feature	Primary bow	Secondary bow
Angle from antisolar point	~42°	~51°
Internal reflections	One	Two
Color order, outer to inner	Red to violet	Violet to red
Brightness	Bright	Noticeably fainter
Red edge faces	Outward	Inward

How To Photograph It — The Polarizer Trick First

If you take one thing from this guide, take this: put a circular polarizer on the lens. Rainbow light is strongly polarized, so rotating the filter will visibly deepen the colors against the sky — or, turned the wrong way, make the bow vanish entirely.

Beyond the filter, expose for the bright sky rather than the dark foreground. A slight underexposure saturates the colors and keeps the storm clouds behind the arc dramatic instead of washed out.

Shoot RAW so you can recover the dynamic range between the luminous bow and the shadowed land beneath it. And shoot quickly, because most rainbows last only a few minutes before the rain or the sun moves on.

Resist the urge to fully neutralize your white balance in editing. A touch of coolness preserves the storm-light mood, and over-correcting toward neutral tends to mute the very colors you came for.

Anchor The Arc To Something On The Ground

A rainbow floating in empty sky is a color test, not a photograph. The picture comes alive when the arc connects to something real — a ridgeline, a single tree, a row of buildings, a lighthouse.

Use a wide lens, roughly 16 to 24mm on full frame, to fit the primary bow's full 84-degree span and still hold a horizon. For a double bow you will want wider still, since the secondary pushes the scene past 100 degrees.

When the light goes soft and the air stays heavy, the same atmospheric thinking behind fog photography applies here. Let the rain and haze behind the bow carry the mood instead of fighting for a clean sky.

Move Your Feet, Not Just Your Lens

Because the bow is centered on your antisolar point, it belongs to you alone and travels as you travel. Step left and the whole arc steps left; you can never walk up to the spot where it seems to touch down.

Use that. Shift your position until the base of the bow lands exactly where you want it — behind the barn, into the lake, onto the skyline — instead of waiting for the sky to arrange itself for you.

It is also why two photographers standing a hundred feet apart capture genuinely different rainbows. The arc is a personal coordinate, not a fixed landmark on the horizon.

The Short Version

Put the sun at your back, wait for the hours when it sits low, and turn toward a shower drifting away from you. Find the shadow of your head, measure out 42 degrees, and the bow will be there.

That is the kind of seeing we build every brief around — reading the sky as a set of decisions rather than a table of numbers. It is the whole reason Vesper exists.

Rainbow Photography FAQ

Can you photograph a rainbow with a phone?

Yes — modern phone cameras handle rainbows well, and their wide default lens easily fits the full arc. Tap to expose for the bright sky rather than the dark ground, then pull the exposure slider down slightly to saturate the colors.

What camera settings work best for a rainbow?

Shoot RAW, keep ISO low, and meter for the bright sky so the colors stay saturated. A circular polarizer rotated to its strongest setting will do more for the image than any single exposure adjustment.

Why can't I ever reach the end of a rainbow?

Because the bow is centered on the shadow of your own head and stays a fixed 42 degrees from it. As you walk toward it, the antisolar point — and the entire arc — moves with you, so the end retreats at exactly your pace.

Can you see a rainbow at night?

Yes, though rarely. A bright full moon behind you can light a faint moonbow in falling rain, following the same 42-degree geometry. Moonbows look white to the eye but reveal real color in a long-exposure photograph.

Does rain have to be falling on me?

No — the rain needs to be falling in front of you, in the part of the sky opposite the sun. You can stand in dry sunshine and photograph a bow in a shower a mile away, which is often the cleanest way to see one.

What is the best lens for a full rainbow?

A wide-angle lens around 16 to 24mm on full frame captures the primary bow's 84-degree span with room for a horizon. Go wider for a double rainbow, or switch to a telephoto to isolate one glowing leg against a dark hillside.