Long exposure photography requires careful technique to avoid common errors that waste time and ruin images. Issues such as uncovered viewfinders, active image stabilization on a tripod, and physically touching the shutter button introduce unwanted light or motion blur that degrades the final result.
Additional pitfalls include miscalculating ND filter exposure times, autofocusing after darkening the lens, using overly small apertures, stacking filters incorrectly, and relying on low-quality glass. Each problem has a straightforward fix, from using remote triggers and exposure calculator apps to investing in quality filters and enabling mirror lock-up.
Long exposure photography is beautiful because it lets you manipulate time. You are slowing down the world, blurring water into silk, and turning moving clouds into paint strokes.
Getting a long exposure right takes preparation. It is frustrating to spend minutes waiting for a single exposure only to realize a tiny oversight ruined the frame. I used to assume every seasoned photographer had this dialed in, but these simple technical slips trip up people all the time.
Let us break down the common mistakes that waste your time in the field, and how to fix your workflow.
1. Leaving the Viewfinder Uncovered
This is a massive issue for DSLR shooters, but mirrorless users can mostly skip it. When your shutter stays open for 30 seconds or a few minutes, stray ambient light creeps into the tiny opening of your optical viewfinder. This creates strange purple or orange light leaks right across your image.
The Fix:Â Cover the viewfinder. Some high-end bodies have a built-in shutter switch. If yours does not, a piece of black gaff tape works perfectly.
2. Forgetting to Turn Off Image Stabilization
Vibration Reduction (VR) or Image Stabilization (IS) is incredible when you shoot hand-held. On a tripod, it does the exact opposite. The system expects movement, so it hunts for vibrations that are not there. This artificial correction actually creates motion blur during a long drag.
The Fix:Â Make it a habit to click off the stabilization switch on your lens or inside your camera menu whenever you lock down onto a plate.
3. Missing the Math on ND Filters
Neutral Density (ND) filters are the secret to daytime long exposures because they act like sunglasses for your lens. A 10-stop filter cuts light by a factor of 1,000, which means you must calculate your exposure time carefully. Guessing leads to completely blown-out highlights or muddy shadows.
The Fix:Â Lean on tech to save your time. Use an exposure calculator app. Pull a base exposure reading without the filter, plug the shutter speed into the app, select your filter strength, and let the software tell you the exact time you need.
4. Letting the Camera Autofocus After Darkening the Lens
If you slap a heavy ND filter onto your lens, the camera sensor sees nothing but pitch blackness. If your focus mode is still set to automatic, the lens will hunt endlessly when you press the shutter, losing your sharp focus point.
The Fix:Â Focus first, then lock it down. Compose your scene, lock your focus while the glass is clear, switch the lens or body to Manual Focus, and then carefully slide or screw on your filter.
5. Pushing the Aperture to f/22
It is tempting to choose a tiny aperture like f/22 to block out light and get longer shutter speeds. The problem is optical diffraction. When light passes through a microscopic pinhole, the waves bend and blur, softening your entire image.
The Fix:Â Keep your lens in its optical sweet spot, which is usually between f/8 and f/11. Use a stronger ND filter instead of a tiny aperture to get those longer times.
6. Physically Touching the Shutter Button
Even the steppest, heaviest tripod setup cannot completely isolate the camera when your finger physically presses the shutter button. That tiny initial nudge creates a micro-shake that softens the final image.
The Fix:Â Use a remote shutter release cable or a wireless trigger. If you do not have one in your bag, use the built-in two-second exposure delay timer in your camera settings so the camera settles before the curtain opens.
7. Neglecting the DSLR Mirror Slap
If you are still shooting with a traditional DSLR camera, the mechanical mirror flips up rapidly right before the shutter opens. That physical slap sends a vibration through the camera body right at the start of your exposure.
The Fix:Â Turn on Mirror Lock-Up mode (M-Up), or shoot using Live View so the mirror stays raised before the exposure begins.
8. Stacking Filters in the Wrong Order
When you need to stack multiple filters to achieve a very dark exposure, order matters. Putting a light filter behind a dark filter can introduce weird internal reflections and color banding.
The Fix:Â Always position your darkest ND filter closest to the actual element of the lens, then stack any lighter filters or polarizers out in front of it.
9. Buying Cheap Glass Filters
Your final image is only as good as the worst piece of glass the light has to travel through. Cheap, budget filters will ruin a great lens. They introduce heavy color casts, magenta or green hues, and noticeably soften your details.
The Fix:Â Invest in high-quality, color-neutral filters. Dealing with nasty color shifts in post-processing wastes hours of editing time that you could spend with your family instead.
10. Trashing the Tripod Setup
A flimsy tripod is useless for long exposures. Wind, passing cars, or shifting dirt will shake the legs. If your platform moves even a fraction of a millimeter during a two-minute shot, the frame goes in the digital trash bin.
The Fix:Â Use a solid, stable tripod. Fully tighten every single adjustment knob. If your center column has a hook underneath, hang your camera bag or a sandbag from it to anchor the system into the ground.
Efficiency in the field means getting the shot right on the first try. Missing a step ruins the workflow and pulls you away from creating a meaningful story with your frame.
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