About the Moon

The Moon is Earth’s only natural satellite. Tidally locked, it always shows the same face to us here on Earth. Its surface is a mix of cratered highlands and darker lava plains called maria. The changing light across its surface creates phases from thin crescents to a full disk. The terminator—the line between day and night—is where shadows are longest, revealing breathtaking surface detail. During thin crescents, earthshine can softly illuminate the dark side of the Moon, making it a fascinating imaging target.

Safety & Practical Notes

Unlike the Sun, the Moon is safe to observe and photograph without special solar filters. However, working at night brings its own considerations:

• Be aware of your surroundings, especially if setting up in the dark.
• Use a red-light torch to preserve night vision.
• Carry spare batteries and consider dew heaters for long sessions in damp conditions.
• Plan cable management to avoid tangling or tripping hazards.

What You’ll Need

Planning Your Session

Choosing the Best Phase

The best time to capture dramatic lunar detail is near the terminator during the crescent or quarter phases, when shadows are long and relief is highlighted. Full Moon is excellent for capturing the entire disk in colour but lacks shadow contrast.

Altitude & Weather

Try to image the Moon when it is high in the sky to reduce atmospheric distortion. Calm, steady air (“good seeing”) is more important than perfect transparency. Use tools like Astrospheric or Meteoblue to check seeing conditions.

Planning Tools

Apps such as PhotoPills, Stellarium, and SkySafari help you plan phases, altitudes, and the position of the terminator.

Setting Up: Step-by-Step

1. Choose a solid location: Place your tripod on stable ground. Use sandbags or weights if windy to minimise vibration.
2. Level the tripod: A level base ensures smoother tracking.
3. Mount your equipment: Attach the Seestar S50, telescope, or DSLR securely.
4. Allow optics to acclimatise: Give your telescope time to reach ambient temperature to avoid focus drift.

Tracking & Polar Alignment

If you’re using a smart telescope like the Seestar S50 in EQ mode, or a DSLR/mirrorless on a star tracker (such as MSM Nomad, Sky‑Watcher Star Adventurer, or iOptron SkyGuider Pro), you’ll need to do a polar alignment before capturing your lunar video.

Why Polar Alignment Is Necessary

Earth rotates on its axis, completing a full turn roughly every 24 hours. This movement causes the Moon and stars to drift across the sky. A tracking mount compensates by moving at the same rate in the opposite direction. For this to work, the mount’s axis must be aligned with Earth’s rotation axis. This is polar alignment.

Without polar alignment, your target will slowly drift and rotate in the field of view. While this might be fine for a single still, video clips for stacking—especially at high magnification—require the Moon to stay stable and correctly oriented across hundreds or thousands of frames.

Popular Star Trackers for Lunar Imaging

• MSM Nomad: Lightweight travel tracker using a laser pointer for fast alignment. Best for wide to medium telephoto lenses.
• Sky-Watcher Star Adventurer 2i: A robust, versatile tracker with sidereal, solar, and lunar modes. Handles small telescopes and heavier lenses.
• iOptron SkyGuider Pro: Precise portable tracker with lunar rate, ideal for long telephoto and small refractors.

How to Polar Align

• Seestar S50: Use the in-app EQ polar alignment tool. Follow the prompts to align to the celestial pole.
• Star Trackers: MSM Nomad uses a laser for quick polar alignment. The Star Adventurer and SkyGuider use an illuminated polar scope and mobile apps to align to Polaris (or Sigma Octantis in the south).
• Always level your tripod first and use fine adjustment knobs for accuracy.

Tracking Rate

The Moon moves slightly differently from the stars. If your mount offers a lunar tracking rate, use it. Otherwise, sidereal tracking is accurate enough for clips under 2–3 minutes.

What Happens Without Polar Alignment?

Even a good EQ mount will introduce drift and rotation without alignment. Over a video clip, this can shift surface details and soften your final stacked image.

Navigating to the Moon

For smart telescopes, use the Go-To function to slew directly to the Moon. With manual setups, frame the Moon through the finder scope or live view. For full-disk shots, centre the entire Moon; for close-ups, position the area of interest in the middle.

Focusing

Zoom in on the lunar limb or a crater and adjust focus carefully. Use live view at maximum magnification if using a DSLR, or the Seestar’s focusing controls. Good focus is critical; take your time and refocus if the temperature drops significantly during the session.

Capturing the Moon

Why Video Instead of Stills?

The atmosphere is constantly shifting. By capturing thousands of frames in a short video and selecting only the sharpest, you can “freeze” moments of steady seeing. This technique, known as lucky imaging, produces far more detail than a single still image.

Recommended Settings

• Video format: Use uncompressed AVI or SER.
• Exposure: Aim for a histogram around 60–70% to avoid clipping highlights.
• Clip length: 1–2 minutes for full-disk; 2–3 minutes for close-ups in EQ mode.
• ISO/Gain: Keep gain low to reduce noise. For DSLRs, start with ISO 100–200. For planetary cameras, adjust gain to balance exposure and noise.
• Aperture: For DSLRs, f/8–f/11 is a good starting point. Use the Looney 11 rule as a baseline: at ISO 100, use around 1/100 s exposure; at ISO 200, 1/200 s.

Pre-Processing in PIPP

1. Load your video into PIPP.
2. Select Lunar Mode to auto-optimise for Moon data.
3. Enable centre stabilisation and crop tightly to the disk.
4. Run quality analysis and discard the worst 20–40% of frames.
5. Export as a 16-bit TIFF sequence or FITS files for stacking.

Stacking Your Images

Using AutoStakkert!

1. Load your PIPP output into AutoStakkert!
2. Analyse the clip and add multiple alignment points across the surface.
3. Stack the best 10–30% of frames for maximum sharpness.
4. Export as a 16-bit TIFF for post-processing.

Using PixInsight or Siril

Both can align and integrate lunar frames using surface registration and sigma-clipping for noise rejection. Siril is a strong free option for Mac/Linux users.

Post-Processing

1. Apply gentle wavelet sharpening with ImPPG to bring out fine detail.
2. Adjust curves and histogram for contrast enhancement.
3. For colour lunar images, adjust white balance for a natural tone.
4. Apply subtle noise reduction to preserve sharpness.

Software Versions

What if I Don’t Have a Seestar S50?

This workflow works with any telescope or camera. For DSLR users, use a sturdy tripod or star tracker, a 300 mm or longer lens, and follow the same video stacking process. Even smartphone adapters on small telescopes can produce excellent lunar images using this workflow.

FAQ

Which phase should I shoot?

Crescents and quarters for dramatic detail; full Moon for full-disk colour.

Do I need EQ mode or a star tracker?

For short clips under 2 minutes, a static tripod works. For high magnification or mosaics, EQ mode or a tracker keeps the target stable.

Which filters are best?

Neutral density to cut glare, red/IR-pass for poor seeing, UV/IR cut for colour balance.

How do I avoid vibration?

Use a heavy tripod, avoid windy nights, use a remote shutter or timer delay, and allow a few seconds to settle after touching the equipment.

Why video over stills?

Video allows lucky imaging—selecting the sharpest frames to beat atmospheric turbulence, producing far better detail than single shots.