Long exposure photography is, at its most basic, the act of recording time rather than a moment. A shutter open for two seconds captures the arc of water tumbling over a weir; open for thirty seconds it records the rotation of car headlights into curved trails of light. In both cases, the photograph contains something the eye could not register directly — a compression of duration into a single static frame.

The Bohemian landscape offers material that suits this technique. The Vltava and Berounka rivers move through terrain that includes waterfalls, narrow gorges, and still pools. The hill country around Šumava has morning mist that moves slowly enough to photograph. The architectural rhythm of towns like Český Krumlov creates reflection surfaces that long exposures can resolve into near-abstractions.

Technical foundations

Long exposure work imposes hard constraints on equipment and technique. A stable tripod is not optional. A camera moved even slightly during a multi-second exposure produces a blurred image with no recoverable sharpness. Carbon fibre tripods are lighter for carrying over terrain; aluminium is cheaper and adequate when weight is less of a concern.

Remote shutter releases — either cable or wireless — eliminate the vibration introduced by pressing the shutter button directly. Many cameras include a two-second or ten-second self-timer as a built-in alternative. Mirror lockup (on DSLR bodies) reduces the vibration introduced by the mirror mechanism on exposures between 1/4 second and 1 second, where it is most audible and measurable.

Neutral density filters

In daylight conditions, achieving a shutter speed of several seconds requires reducing the amount of light reaching the sensor beyond what aperture and ISO adjustments alone can achieve. Neutral density (ND) filters are optically neutral glass or resin elements that reduce light transmission by a fixed number of stops.

Common values in use for landscape work:

  • 3-stop ND (ND8) — reduces light by a factor of 8. Sufficient for softening water movement in overcast conditions.
  • 6-stop ND (ND64) — a standard choice for daytime river photography, converting a correct 1/60s exposure into a four-second exposure.
  • 10-stop ND (ND1000) — used for extreme long exposures in bright conditions. A 1/250s base exposure becomes approximately four seconds.

Stacking multiple ND filters is possible but introduces increased risk of vignetting and colour cast. Single high-density filters are preferred for critical work. Brands with consistent optical quality include B+W, Lee Filters, and Hoya.

Golden hour landscape light

Golden hour light over a landscape — the hour following sunrise or preceding sunset produces directional light that long exposures record with a warmth not visible at midday. Image: Wikimedia Commons.

Czech locations for long exposure work

Český Krumlov and the Vltava bend

The Vltava makes a near-complete loop around the old town of Český Krumlov. The most photographed angle — from the castle viewpoint — shows the river curving around the historic centre. At dawn, before tour groups arrive, the scene is relatively static. A 30-second exposure from this position records the sky's colour gradient across the water surface.

Downstream, the river narrows and the current increases. Here, exposures of one to four seconds convert the surface into a textured blur while retaining the detail of riverbank vegetation and stone.

Divočák and the Berounka valley

The Berounka river valley west of Prague has a series of accessible banks and weirs between Beroun and Křivoklát. The weirs produce consistent white-water that photographs differently depending on shutter speed: at 1/500s the water is frozen mid-air; at 2 seconds it becomes a smooth pour; at 30 seconds the surface texture is almost completely eliminated, leaving only the shape of the fall.

Šumava — mist and forest

The Šumava highland region on the Austrian and German borders has a high frequency of fog and low cloud in autumn mornings. The forest contains several large peat bogs with standing water that reflects morning light effectively. Long exposures in these conditions — typically 15 to 60 seconds — record the slow movement of mist between trees as a soft continuous layer rather than discrete wisps.

The area around Modrava and the Vydra river is accessible but requires driving on unpaved roads. Weather forecasting for fog is unreliable beyond 24 hours; photographers who work in this area typically plan for two or three consecutive mornings to increase the chance of usable conditions.

Night and blue-hour exposure in Czech towns

Czech historic towns were largely not demolished during World War II, which means their centres retain medieval and baroque street lighting scales. Public lighting in these areas tends to be warm and relatively low-intensity compared to modern urban environments. This makes the period immediately after sunset — the blue hour — particularly useful: sky and artificial light reach a balance that avoids both the overexposed lamps and the underexposed stone visible later in the night.

Exposure management at night

A typical exposure in the blue hour in a Czech old town square: f/8, ISO 100, 30 seconds. This assumes a stable tripod. The resulting image records sky colour, architectural detail, and any moving elements — people, vehicles — as either blurred ghosts or, if they moved through the frame quickly, as near-invisible contributions to the exposure.

Managing the highlights around lamp posts and illuminated signage is the main technical challenge. Graduated neutral density filters help if the sky is brighter than the ground. HDR blending from multiple exposures is an alternative for extreme contrast situations, though it introduces processing complexity.

The relationship between aperture and long exposure

Long exposure work often uses smaller apertures (f/8 to f/16) not primarily for depth of field reasons but because smaller apertures extend the exposure time needed for a correct exposure. This creates a secondary visual effect: point light sources at small apertures produce starburst patterns due to diffraction around the aperture blades. Lamp posts and streetlights in night exposures render as multi-pointed stars at f/11 or f/16 where they would appear as smooth discs at f/4.

The relationship between aperture and depth of field in these contexts is explored more fully in the piece on understanding aperture and depth of field.

Post-processing considerations

Long exposure images on digital sensors are affected by sensor heat and long-exposure noise — random bright pixels appearing in dark areas. Most modern cameras include a long-exposure noise reduction function that takes a second exposure with the shutter closed (a dark frame) and subtracts the pattern from the main image. This doubles the time required per shot but produces cleaner results.

For photographers who prefer to handle this in post-processing, a dark frame captured at the same ISO and exposure length can be subtracted manually in software such as Adobe Lightroom, Capture One, or open-source alternatives including RawTherapee.

Colour casts introduced by ND filters can be corrected in raw processing. The shift is typically toward magenta or green depending on the filter brand and density; saving the correction as a camera profile or preset for a specific filter and camera combination saves time across a shooting series.