Milky Way Photography from Guyana

Milky Way Photography from Guyana

Low latitude is an advantage: the galactic core climbs high in season, with southern treasures in the same sky.

From Guyana you are well placed for dramatic core arches when season, Moon, and weather align. Coastal light pollution pushes you inland for dust-lane detail, see Dark Skies in Guyana.

The galactic core photographed from the Rupununi savannah in inland Guyana, by the site's owner.

Season and timing

From Guyana the core is usable from about February to October: a pre-dawn target from February to May, up most of the night in June, and an evening target from July to October, with the most dark hours of core time in May, June and July. From November to January it is too close to the Sun. It culminates about 54° up in the south from Georgetown (58° from Lethem). Use the Milky Way Season Planner for exact hours on your dates. Always overlay Dark Sky Window for Moon and Stargazing Weather for cloud.

The core's season month by month from Georgetown and Lethem: hours of full darkness with the core high enough to shoot.

The Milky Way's core from Georgetown at 22:00 on each new-Moon night from February to October 2027, with the hours it is 15° or more up in the dark, and what the full Moon of 18 June does.

One night planned: the core, the Moon and twilight together, and the hours you can actually shoot.

Can you shoot the core at 21:00 tonight? The answer is worked out for tonight.

Field workflow

1. Pick a dark site and safe access.
2. Arrive in twilight; compose with a bright landmark if desired.
3. Use the Field Guide for targets and FOV vs focal length.
4. Shoot raw; track or untracked wide-field both work, match exposure to skyglow.
5. Keep lenses dry; bag the camera between sets if dew is heavy.

Where the galactic core is on tonight's sky over Georgetown or Lethem.

Settings starting points (untracked wide)

• 14-24 mm, f/2.8 or faster, ISO 1600-6400, about 8-18 s: the NPF rule, (35 × f-number + 30 × pixel pitch in µm) ÷ focal length, gives about 9 s at 24 mm f/2.8 and about 16 s at 14 mm f/2.8 on a 4 µm sensor (test trailing).
• Take darks/flats if you stack; otherwise expose carefully and denoise later.

The NPF rule from this section beside the old 500 rule: set your lens, aperture and sensor, and see how far a star near the core moves during your exposure.

Composition ideas

• Core over river, farm, or forest silhouette.
• Dark lane contrast on transparent nights.
• Panoramas for full arch, level the tripod, overlap 30%+.

Frames along the arch at the overlap you choose.

From Guyana, which months give the most dark hours with the core up?

• November to January
• February and March
• May, June and July (the right answer)
• September and October

May, June and July, as the season section says; the season chart above computes it month by month.

NPF rule: a 20 mm lens at f/2.8 on a sensor with 4 µm pixels. About how long before stars trail?

• About 25 s (the 500 rule on full frame)
• About 11 s (the right answer)
• About 4 s

(35 × 2.8 + 30 × 4) ÷ 20 = 10.9 s. The 500 rule gives 25 s on a full-frame camera, long enough to trail on a modern sensor. Try it in the exposure lab.

Next

• How-tos: Season Planner, Field Guide
• First light: Your First Astrophoto