Nikon Z8 Astrophotography Field Guide
An Unexpected Question
This guide started rather unexpectedly.
Someone recently asked whether I had any advice on using the Nikon Z8 for astrophotography. It isn't a subject I normally cover at Alan Young Photography, where wildlife and bird photography naturally dominate, but the question made me think.
By coincidence, I'd also noticed searches relating to Nikon Z8 astrophotography appearing in my website data. Clearly, a few photographers were arriving at AYP looking for answers I hadn't provided.
The slightly amusing part is that I had already pointed the Z8 skywards. In December 2025, I photographed the Moon using my Z8 and the NIKKOR Z 180-600mm at 600mm. No telescope, tracking mount or specialist astronomical equipment. In fact, the photograph above was taken handheld through a skylight at home.
So perhaps the question deserved a proper answer.
What follows isn't an introduction to specialist deep-sky imaging. It's a practical, technically detailed field guide to getting the most from the Nikon Z8 for the Moon, stars and night sky using conventional photographic equipment.
Why the Nikon Z8 Works for Astrophotography
Although designed as a highly versatile mirrorless camera rather than a specialist astronomical instrument, the Nikon Z8 has several characteristics that make it particularly capable for night-sky photography.
Its 45.7-megapixel full-frame sensor provides substantial resolution for recording fine lunar detail and gives useful cropping latitude when working with subjects such as the Moon. For wider night-sky photography, the large sensor also provides a good balance between resolution and low-light performance.
The Z8's electronic shutter removes the mechanical movement associated with a conventional shutter, eliminating shutter-induced mechanical vibration during the exposure. When the camera is securely supported, this eliminates one potential source of vibration during exposure.
Manual focusing is equally important. The electronic viewfinder and rear display allow the image to be magnified substantially, making it possible to focus carefully on a bright star or fine lunar detail rather than relying entirely on autofocus.
RAW capture is particularly valuable. Night-sky files can require significant adjustment to exposure, white balance, shadow detail and noise, so retaining the maximum available image data provides considerably more flexibility during processing.
But the Z8 also presents an interesting challenge: 45.7 megapixels are unforgiving. Small focusing errors, vibration and star movement that might be less obvious on a lower-resolution camera can become readily visible when files are examined closely.
That means technique matters.
Setting Up the Nikon Z8 for the Night Sky
Astrophotography benefits from taking control away from the camera. My normal wildlife setup of Manual exposure with Auto ISO is therefore not the starting point I would choose here.
For most night-sky work, use Manual exposure with a fixed ISO. This keeps exposures consistent and prevents the camera changing sensitivity as the composition or brightness of the sky changes.
RAW 14-bit is the natural choice. Night photographs often need considerable tonal and colour adjustment, so retaining the maximum information in the file is worthwhile.
For a camera mounted securely on a tripod, switch Vibration Reduction off. VR is designed to correct camera movement and generally offers no advantage when the camera itself is stationary. If shooting the Moon handheld, however, VR becomes extremely useful, as my 600mm example demonstrates.
Focusing
For stars, autofocus should not be assumed to find accurate infinity focus in a dark sky.
Select a bright star, magnify the live-view image and focus manually until the star appears as small and sharply defined as possible. Do not simply rotate the lens to its infinity stop. The most accurate position may differ slightly.
For the Moon, there is sufficient contrast for autofocus to work effectively, although magnified manual focus provides a useful confirmation when maximum detail is required.
Exposure Delay and Remote Release
When tripod-mounted, avoid physically disturbing the camera as the exposure begins. A remote release or the Z8's self-timer can achieve this without adding specialist astrophotography equipment.
The objective throughout is simple: remove every avoidable source of movement before worrying about exposure settings.
Photographing the Moon with the Nikon Z8
The Moon is often grouped with other astrophotography subjects, but photographically it behaves very differently. It is a brightly illuminated object, so the long exposures and very high ISO settings associated with photographing stars are generally unnecessary.
A good starting point with the Z8 is:
Exposure mode: Manual
Image quality: 14-bit RAW
ISO: 64-200
Focal length: around 400-600mm for detailed lunar photography
Aperture: around f/7.1-f/8
Shutter speed: approximately 1/250-1/1000 sec
Treat these as starting points rather than fixed settings. The Moon's brightness varies with its phase, atmospheric conditions and position in the sky. At longer focal lengths, a sufficiently fast shutter speed also helps minimise camera movement and the effects of atmospheric turbulence.
Protect the Highlights
Exposure is particularly important because the brightest lunar areas can lose texture surprisingly easily. Check the histogram and highlight information rather than judging exposure solely from the rear screen.
Slight underexposure is generally preferable to clipping important highlight detail. The Z8's RAW file provides useful processing latitude afterwards.
Don't Assume a Full Moon Gives the Most Detail
A full or nearly full Moon certainly makes an impressive subject, but it isn't necessarily the best phase for revealing surface relief.
When sunlight strikes the lunar surface at a lower angle, particularly around the terminator, shadows cast by craters, ridges and mountains reveal considerably more apparent texture and depth.
Choosing a Focal Length
For the Moon, longer focal lengths are preferable when the aim is to record surface detail. On the Nikon Z8, 400-600mm provides a very useful working range, with 600mm giving a substantial lunar image while retaining the flexibility of conventional photographic equipment.
For stars and wider night-sky photography, a much shorter focal length is generally more practical. Around 14-24mm is an excellent starting range for capturing broad areas of sky, while 20-35mm can provide a tighter composition with greater emphasis on individual constellations or areas of the Milky Way.
There is no single optimum focal length. The choice depends on whether the subject is the Moon, a broad star field, or a night landscape.
Photographing Stars: Shutter Speed Matters
Stars introduce a very different problem from the Moon. They appear faint, so we need longer exposures, but the Earth's rotation means that an exposure can quickly become long enough for stars to record as short trails rather than points.
The traditional 500 Rule suggests dividing 500 by the focal length to estimate the longest exposure before obvious trailing occurs. With a 24mm lens, for example:
500 ÷ 24 = approximately 21 seconds
For the Nikon Z8, I would regard that as too generous if the aim is genuinely sharp, point-like stars. Its 45.7-megapixel sensor resolves small amounts of movement very clearly.
A More Conservative Starting Point
For static tripod photography with the Z8, I would begin around:
Focal length | Starting shutter speed |
14mm | 15-20 sec |
20mm | 10-15 sec |
24mm | 8-13 sec |
35mm | 6-8 sec |
50mm | 4-6 sec |
These are starting points rather than fixed limits. Star movement varies according to where the camera is pointed in the sky, and acceptable sharpness also depends on the final image size.
Aperture and ISO
For stars, the objective is to collect as much light as practical within the limited exposure time. A fast lens is therefore a considerable advantage. An aperture around f/1.8 to f/2.8 provides a useful starting point, although some lenses may benefit from being stopped down slightly to improve corner performance and reduce coma.
Start around ISO 1600 to 3200 and assess the RAW file rather than relying solely on how bright the rear-screen preview appears.
Don't Underexpose Simply to Protect the Sky
With stars, increasing ISO does not actually make the sensor collect more light. The amount of light recorded is determined by aperture and exposure time. ISO controls how that captured signal is represented in the resulting file.
The practical aim is therefore to maximise useful exposure without allowing unwanted star movement or clipping important highlights.
After making a test exposure, magnify the image and inspect the stars. If they are beginning to elongate, shorten the shutter speed. If they remain sharp but the file is too dark, consider increasing ISO rather than extending the exposure beyond the point where movement becomes visible.
Check the Corners
Also inspect stars near the edges of the frame. At very wide apertures, some lenses can produce coma, causing stars to appear stretched or wing-shaped. Stopping down slightly may improve corner performance considerably, even though it costs some light.
Manual Focusing the Nikon Z8 at Night
Accurate focus is one of the most important parts of night-sky photography. A small error that looks acceptable on the rear screen can become obvious when a 45.7-megapixel Z8 file is viewed at full resolution.
For stars, switch the lens to manual focus and select a bright star. Use the Z8's magnified live view to enlarge it substantially, then adjust focus until the star appears as small and sharply defined as possible.
Do not assume that simply turning the focus ring to infinity will produce accurate focus. The true infinity position can vary with the lens and temperature.
Once focus is established, avoid touching the focus ring. Check it periodically during a longer session, particularly if the temperature changes significantly.
For the Moon, autofocus can work very effectively because there is ample contrast, but magnified live view remains useful for confirming critical focus before shooting.
Tripod, Vibration Reduction and Camera Movement
For longer exposures of stars, a stable tripod becomes essential. Once the Nikon Z8 is securely supported, the objective is to eliminate movement rather than compensate for it.
With the camera firmly tripod-mounted, I would normally switch Vibration Reduction off. For handheld lunar photography, however, VR remains extremely valuable, particularly at long focal lengths.
Avoid pressing the shutter release immediately before a long exposure. Use a self-timer or remote release so any movement introduced while operating the camera has time to settle.
Wind can be just as significant. A long lens, extended tripod centre column or loosely hanging camera strap can transmit surprisingly small movements into a high-resolution Z8 file.
For wide-field stars, keep the tripod low and stable where practical and avoid extending the centre column unnecessarily.
Long Exposure Noise Reduction and High ISO Noise Reduction
The Nikon Z8 provides two different forms of in-camera noise reduction, and it is useful to understand what each is doing.
Long Exposure NR is designed primarily to reduce fixed-pattern noise and hot pixels during long exposures. After the photograph is taken, the camera makes a dark-frame exposure of similar duration and uses this to identify and reduce unwanted artefacts.
The disadvantage is time. A 30-second exposure can therefore require roughly another 30 seconds of processing before the camera is ready again. For a sequence of night-sky photographs, that interruption can become significant.
High ISO NR affects JPEG processing rather than the underlying RAW data in the same way. When shooting 14-bit RAW for later processing, I prefer to retain control over noise reduction in software.
With the Z8, I would therefore start with:
Long Exposure NR: Off for repeated exposures, consider On for occasional single long exposures
High ISO NR: Low or Off
RAW: 14-bit
White Balance and RAW Processing
When photographing the night sky in RAW, white balance is not permanently baked into the image, so it can be refined during processing. Nevertheless, choosing a sensible value in-camera makes evaluating images in the field easier.
For stars and wider night-sky scenes, a fixed white balance around 3500-4000K can provide a useful starting point, particularly where artificial light pollution is present. Avoid treating this as a required value, however. Atmospheric conditions and local lighting can alter the colour considerably.
For the Moon, Daylight white balance provides a sensible neutral starting point.
The objective isn't to make every night sky blue. Preserve believable colour in the stars and lunar surface rather than processing towards a predetermined appearance.
Processing Nikon Z8 Night-Sky Files
Night-sky photographs can tempt us into aggressive processing because there is so much information hidden within a dark RAW file. The aim should still be to reveal detail without making the result look artificial.
In Lightroom Classic, begin with overall exposure and white balance before adjusting contrast. Highlights deserve particular care with lunar photographs, while star fields often benefit from restrained shadow adjustment rather than simply lifting the entire sky.
Noise reduction becomes more important as ISO rises. DxO PureRAW can be particularly useful with high-ISO Z8 files, but examine fine stars carefully after processing. Noise reduction should not mistake genuine small points of light for noise or soften subtle structure.
Sharpening deserves similar restraint. The Z8 already records considerable fine detail. With lunar images especially, excessive sharpening can create bright halos around crater edges and an unnaturally brittle surface.
Natural first, spectacular second.
Nikon Z8 Astrophotography Quick Settings
Setting | Moon | Stars |
Exposure mode | Manual | Manual |
File type | 14-bit RAW | 14-bit RAW |
ISO | 64-200 | 1600-3200 |
Aperture | f/7.1 - f/8* | f/1.8 - f/2.8* |
Shutter | 1/250-1/1000 sec* | Focal-length dependent |
Focus | AF or Manual | Manual |
White balance | Daylight | 3500-4000K* |
VR | On handheld / Off tripod | Off on tripod |
Focal Length | 400-600mm | 14-35mm typical |
* These are starting points rather than fixed settings. Lens choice, lunar phase, atmospheric conditions, light pollution and the area of sky being photographed can all require adjustment.
Final Thoughts
The Nikon Z8 doesn't require specialist astronomical equipment to make a start with astrophotography. A conventional lens, careful exposure and accurate focusing can take you surprisingly far.
The Moon photograph at the beginning of this guide is perhaps the best example. It was made handheld at 600mm through a skylight, using equipment normally intended for wildlife photography.
For more ambitious night-sky work, technique becomes increasingly important, particularly with the resolution of the Z8. But the principles remain familiar:
understand the light, control movement, focus carefully and make the most of the RAW file.
Sometimes it simply pays to point the camera in a different direction.
And occasionally through the roof. 🤓
This guide forms part of the growing Nikon Z8 practical photography resources at Alan Young Photography (AYP).
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