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Photograph the corona only during totality, and only after the Moon completely covers the Sun’s bright photosphere. Keep a purpose-built solar-imaging filter securely mounted over the front of the lens during every partial phase and whenever any bright sunlight is visible. Remove it for the brief total phase, then replace it immediately at the first return of the photosphere. Never put eclipse glasses over a camera lens: they are for unaided eyes, not concentrated optical light.
The non-negotiable safety rule
Unfiltered sunlight can permanently damage both eyes and camera equipment. NASA states that looking directly at the Sun is dangerous to your eyes and your camera. A camera lens, telescope or binocular objective concentrates sunlight onto the camera’s internal optics and sensor; the damage can occur quickly, even when the image on the screen does not look unusually bright.
For any partially eclipsed Sun, mount a solar filter over the front of the lens. It must be designed for solar imaging, fit the exact outside diameter of your lens, and be held securely so wind or handling cannot expose the optics. A filter placed behind the lens is unsafe because concentrated rays have already passed through the objective. A loose sheet or handheld filter is also unsafe because it can shift or leave gaps.
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During a total solar eclipse, the filter may be removed only after the Moon has completely covered the bright photosphere. That short interval is totality, when the much fainter corona becomes visible. Put the filter back on before the photosphere reappears. During a partial or annular eclipse, no filter-free interval is safe: some bright photosphere remains visible throughout.
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Why eclipse glasses must not go on a camera
Eclipse glasses and handheld solar viewers are intended for direct viewing by the unaided eye. NASA specifically warns not to look at the Sun through a camera lens, telescope, binoculars or another optical device while wearing eclipse glasses or using a handheld solar viewer. Concentrated rays can burn through the viewer and reach the eye.
The American Astronomical Society (AAS) says special-purpose solar viewers conforming to ISO 12312-2 are required for direct viewing outside totality. A camera filter is a different product category: it must be made for solar imaging and sized for the lens. ISO 12312-2 eyewear compliance does not turn an eyewear product into a safe camera-lens filter.
Choose the filter before choosing camera settings
Searches for a “camera solar filter” can return products with very different purposes. Treat the filter as the safety-critical purchase and verify the listing and documentation before eclipse day.
| What to check | What acceptable equipment looks like | Why it matters |
|---|---|---|
| Mounting position | A rigid, front-mounted filter attached to the lens hood, a threaded adapter or a dedicated holder | Filtering before light enters the objective prevents concentrated sunlight from reaching internal components. |
| Fit | The stated size matches the exact outside diameter or adapter specification of your lens | A filter that is too small can leave a direct-light gap; a loose fit can be blown off. |
| Attenuation and purpose | Solar-imaging attenuation with manufacturer documentation; typical solar filters reduce visible and infrared energy by about 100,000 times | Ordinary neutral-density filters, stacked photographic filters and improvised materials are not established substitutes. |
| Condition | Rigid, clean material with no scratches, tears, pinholes, delamination or wrinkles that create openings | Even a tiny defect can admit hazardous sunlight. |
| Removal and replacement | A cover or holder that can be removed and reinstalled quickly without touching the glass | Totality is short, and the filter must return before the bright photosphere does. |
| Documentation | Clear instructions, intended use for solar imaging and traceable safety information | Do not infer safety from a generic “dark” appearance or an eyewear certification. |
Inspect the filter at home under a bright room light. Do not use it if you can see a pinhole, split, scratch through the filtering layer or a loose mount. Keep a front cap or protective case on it when it is not installed.
Understand the eclipse phases before you rehearse
Partial phases
Before and after totality, the unobscured photosphere is intensely bright. The filter stays on the lens for the entire partial phase. That includes the first and last contacts, crescent-Sun photographs and any moment when you are uncertain whether totality has begun or ended.
Totality
Totality starts only when the Moon has fully covered the bright face of the Sun. The corona then appears as a faint, extended halo. Remove the filter after the last bright photospheric sliver disappears, and replace it at the first bright return. Do not use a clock alone to decide: contact timing, clouds and your observing location determine the actual interval.
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Annular eclipses
An annular eclipse leaves a bright ring of photosphere around the Moon. Because the photosphere never disappears, there is no safe filter-free interval. Keep the solar filter installed for the entire event.
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- Identify the exact lens and filter diameter. Read the lens barrel or cap for the filter-thread or front-diameter marking, then verify how the chosen holder attaches. A threaded rear filter or a filter that covers only the camera body is not an acceptable arrangement.
- Install the filter and inspect the seal. With the camera powered off, attach the filter firmly. Gently check that it cannot rotate out, slide forward or lift at an edge. If the holder uses a retaining screw, tighten it without stressing the filter material.
- Switch to manual exposure and manual focus. Autofocus can hunt against a small, low-contrast solar disk, and automatic exposure can change as clouds pass. Focus on the filtered Sun in daylight, magnify the live view, and adjust until the limb is as sharp as your optics allow.
- Mark or tape the focus position. Once focus is set, prevent accidental movement. Recheck it after transporting the camera, because zoom rings and focusing rings can shift in a bag.
- Practice the filter sequence. Rehearse: start with the filter installed, remove it without covering the lens with your hand, make a short burst or bracket, then reinstall it. Practice while wearing the gloves or clothing you will use outdoors. The aim is a controlled movement, not speed at the expense of security.
- Set up vibration control. Use a stable tripod and delayed shutter release. Disable any automatic mode that might refocus or alter exposure between frames. A remote release is useful, but the delayed timer is sufficient if you cannot use one.
- Record the planned contact times. Keep a printed or offline schedule for your observing location. Build in a reminder to reinstall the filter before the predicted end of totality, while still watching for the actual return of sunlight.
Starting exposure settings for the filtered Sun
NASA’s photography guidance suggests starting around f/8 to f/16 with shutter speeds from 1/1000 second to 1/4 second for filtered partial phases. These are starting points, not universal settings. Haze, thin cloud, filter transmission, lens diameter and camera sensitivity all change the result, so bracket exposures rather than trusting one frame.
| Phase | Aperture guidance | Shutter-speed starting range | Filter status |
|---|---|---|---|
| Filtered partial eclipse | Approximately f/8–f/16 | 1/1000 s through 1/4 s, adjusted and bracketed | Front-mounted solar filter required |
| Totality and corona | Keep the aperture fixed while bracketing | Approximately 1/1000 s through 1 s | Filter removed only after complete photosphere coverage |
| Annular eclipse | Use the filtered partial-phase approach | Bracket within the filtered range | Filter remains installed throughout |
Use the camera’s lowest native ISO as a sensible starting point, then change ISO only when the available shutter and aperture range cannot produce a usable histogram. The supplied guidance does not establish one universal ISO value; exposure depends on the camera, filter and sky. Keep the same ISO while making a bracket whenever possible so the sequence is easier to compare.
Why totality needs a bracket, not one “correct” exposure
The corona has an enormous brightness range. The inner corona close to the Moon is much brighter than the long outer streamers. A single exposure cannot preserve detail across both areas. During totality, keep the aperture fixed and make a bracket from roughly 1/1000 second to 1 second. The shortest frames protect the bright inner regions; longer frames reveal progressively fainter outer structure.
Begin with the short end of the sequence, then lengthen the shutter in controlled steps. Watch the remaining totality time and do not let a complicated sequence delay filter replacement. If clouds or haze reduce contrast, repeat a few useful exposures rather than attempting an unnecessarily large series.
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Framing the corona and selecting a focal length
NASA Goddard Space Flight Center guidance puts a practical focal length near 1000 mm for easier framing and long coronal streamers. On 35 mm-equivalent equipment, keep the focal length roughly below 1500–1800 mm when you want the full-disk corona. The approximate solar image diameter is:
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- Make a filter on your own for any telescope / binoculars / camera, and for a fraction of what factory made filters cost.
- The sun will appear in a natural orange color when viewed through your telescope using this filter.
- WARNING: ALWAYS MAKE SURE THE FILTER IS WELL ATTACHED TO THE TELESCOPE/BINOCULARS, USING STICKY TAPE, TO KEEP IT FROM FALLING WHILE OBSERVING!
image diameter ≈ focal length ÷ 109
Use the same units for both quantities. At a longer focal length, the Sun occupies more of the frame, but you see a smaller portion of the outer corona and tracking becomes harder. A focal length that is too long can make it difficult to find the Sun, keep the disk centered and capture streamers extending beyond the limb.
Long telephoto setup
A long lens can produce a detailed disk and inner corona when mounted on a solid tripod. Leave enough margin around the Sun for drift and for the outer streamers. Check the field of view during the filtered rehearsal, not during totality.
Wide-angle environmental setup
A wide-angle camera can record the darkened landscape, horizon glow and the corona as part of the scene. It is a valid choice when a long lens is unavailable or when you want an image that shows the eclipse location. The same safety rule applies: keep the solar filter on whenever the bright photosphere is visible. During totality, removing the filter allows the corona and surroundings to be recorded together.
A practical eclipse-day sequence
Before first contact
- Mount the camera on the tripod and confirm the filter is secure.
- Set manual focus, manual exposure and the planned ISO.
- Test the delayed shutter release and confirm that the camera is recording to a card with adequate space.
- Make a few filtered test frames and inspect the Sun’s edge at high magnification.
During the filtered partial phase
- Keep the filter installed continuously.
- Use the f/8–f/16 and 1/1000–1/4-second ranges as starting points.
- Bracket when haze or cloud changes the brightness; do not compensate by removing the filter.
- Check framing periodically, because the Sun moves across the sky and a long lens has a narrow field of view.
At the approach to totality
- Stop changing menu settings and confirm the camera is in the preselected manual mode.
- Place the filter where you can retrieve it immediately after totality; do not set it on the ground or where it can be blown away.
- Watch the Sun, not only the countdown. Remove the filter only when the final bright photospheric sliver has disappeared and totality is visually confirmed.
During totality
- Start the short-to-long bracket, approximately 1/1000 second through 1 second, with the aperture fixed.
- Review framing only briefly; avoid spending the entire interval looking at the screen.
- Keep the filter in your hand or on a secure surface so replacement is immediate.
At the end of totality
- Replace the filter at the first unmistakable return of bright photosphere, even if your planned totality time has not elapsed.
- Confirm the filter is fully seated before taking another photograph.
- Resume filtered partial-phase settings and continue bracketing as conditions change.
Common mistakes and how to correct them
“The filter is behind the lens, so the camera is protected.”
It is not. A rear-mounted filter allows concentrated sunlight through the objective before attenuation. Move the filter to the front of the complete optical system and verify that no adapter leaves an uncovered opening.
“The view is dark, so eclipse glasses are safe on the lens.”
Darkness is not a safety specification. Eyewear is designed for the unaided eye, and optical devices concentrate the rays. Use a purpose-built, front-mounted camera solar filter instead.
“I can remove the filter for a partial crescent because most of the Sun is covered.”
Any visible photosphere is bright enough to require filtration. A thin crescent still contains intense sunlight. Keep the filter on until complete coverage at totality.
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- Black polymer is the most common filtering material for observing sunspots and granulation, through telescopes and binoculars.
- These sheets are a quality product of Thousand Oaks Optical, Arizona, a manufacturer of safe solar filters for over 30 years. "Stronger than Mylar with the filtering properties protected within the substrate. Guaranteed five years."
- Make a filter on your own for any telescope / binoculars / camera, and for a fraction of what factory made filters cost.
- The sun will appear in a natural orange color when viewed through your telescope using this filter.
- WARNING: ALWAYS MAKE SURE THE FILTER IS WELL ATTACHED TO THE TELESCOPE/BINOCULARS, USING STICKY TAPE, TO KEEP IT FROM FALLING WHILE OBSERVING!
“One totality exposure should show everything.”
The inner and outer corona differ greatly in brightness. Use the approximate 1/1000-second-to-1-second bracket so different frames retain different parts of the corona’s range.
“A very long lens is automatically better.”
Excessive focal length narrows the field, magnifies tracking errors and clips outer streamers. The 1000 mm guidance is a practical framing reference; staying below roughly 1500–1800 mm on 35 mm-equivalent equipment helps preserve the full disk and surrounding corona.
“Clouds mean I should remove the filter to brighten the image.”
Never remove it while any photosphere is visible. Bracket shutter speeds, adjust the camera’s sensitivity within your planned limits and accept that heavy cloud may obscure the image.
Will a solar filter damage the camera?
A correctly installed, purpose-built front solar filter is intended to reduce the sunlight entering the optical system; typical solar filters attenuate visible and infrared energy by about 100,000 times, according to NASA Goddard Space Flight Center guidance. The greater risk is operating without a suitable filter, using a damaged filter or allowing it to shift. Inspect the filter before every session, protect it from scratches and keep it attached whenever the bright photosphere is present.
Heat can still build in equipment left in direct sunlight for long periods, especially in a dark camera body or enclosed bag. Keep the camera shaded when it is not being used, but do not improvise a shade that blocks your view or loosens the filter. The filter’s optical safety, secure fit and condition matter more than how dark the live-view image appears.
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What the settings can and cannot guarantee
The aperture and shutter ranges above are measured starting points from NASA’s March 21, 2024 photography guidance, not a guarantee for every camera. A filter’s transmission, atmospheric haze, cloud thickness, sensor response and focal length all affect the histogram. The same shutter speed can produce different results on two cameras or through two filters.
Make the filtered Sun exposure decision before eclipse day, then use totality for the corona bracket. Do not experiment with autofocus, unfamiliar metering modes or a new filter during the few minutes when the photosphere is absent. Preparation protects both the equipment and the limited observing time.
Minimal safe kit
- Camera with manual exposure and manual focus.
- Lens selected for the desired field of view.
- Purpose-built, front-mounted solar-imaging filter that fits that lens.
- Stable tripod and delayed shutter release or remote release.
- Spare memory card and fully charged battery.
- Protective case or cap for the filter.
- Printed or offline contact timings for the observing location.
A tripod and delayed release improve sharpness, but they are secondary accessories. The filter is the component that prevents hazardous sunlight from entering the optical system.
Quick Recap
Final safety checklist
- Is the filter made for camera solar imaging rather than for unaided-eye viewing?
- Is it mounted over the front of the complete lens and secured against wind or accidental contact?
- Does it fit the exact lens diameter with no gap?
- Has it passed a close inspection for pinholes, tears, scratches and loose edges?
- Have manual focus, exposure, ISO and delayed release been rehearsed with the filter installed?
- Will you remove the filter only after totality begins and replace it at the first bright return?
- Are you prepared to keep the filter on for the entire event if it is annular rather than total?
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