11–20 cm
Typical length (family range)
1/800 s
Shutter: perched / still
1/2500–1/3200 s
Shutter: action / flight
f/5.6–f/7.1
Aperture
36,592
Research-grade sightings in N. America
Recommended camera settings#
ModeManual + Auto ISOLock shutter & aperture, let ISO float
Shutter (still)1/800 s
Shutter (action)1/2500–1/3200 s
Aperturef/5.6–f/7.1
FocusAF-C + subject/eye detectionBird-eye AF with continuous focus (AF-C/AI Servo); fill at least a third of the frame.
DriveHigh-speed burst
Lens400–600 mmFull-frame equivalent
Focal length needed to frame it#
For a subject about 16 cm long filling a third or half of the frame width horizontally. Small birds demand long lenses and a close approach — a blind or feeder setup helps.
| Distance | ⅓ of frame (FF) | ½ of frame (FF) | ⅓ of frame (APS-C) | ⅓ of frame (MFT) |
|---|---|---|---|---|
| 5 m (16 ft) | 356 mm | 520 mm | 237 mm | 178 mm |
| 10 m (33 ft) | 712 mm | 1,040 mm | 475 mm | 356 mm |
| 15 m (49 ft) | 1,068 mm | 1,561 mm | 712 mm | 534 mm |
| 20 m (66 ft) | 1,424 mm | 2,081 mm | 949 mm | 712 mm |
| 30 m (98 ft) | 2,136 mm | 3,121 mm | 1,424 mm | 1,068 mm |
| 50 m (164 ft) | 3,559 mm | 5,202 mm | 2,373 mm | 1,780 mm |
About the Purple Finch#
The purple finch (Haemorhous purpureus) is a bird in the finch family, Fringillidae.
Summary adapted from Wikipedia via iNaturalist (CC BY-SA 4.0).
Field-craft tips#
- Thistle and sunflower feeders attract goldfinches and siskins.
- Bird-eye AF with continuous focus (AF-C/AI Servo); fill at least a third of the frame.
- Sightings peak in April and May, which is when you'll have the most chances.
Ethics#
- The welfare of the animal comes first: if it changes its behaviour because of you, you are too close.
- Stay on trails, respect closures around nests, leks, dens and haul-outs.
- Avoid playback and baiting in sensitive seasons; never bait predators.
- Don't share precise locations of rare, nesting or roosting animals publicly.
More Finches, Euphonias, and Allies#
Frequently asked questions#
What lens do I need to photograph a Purple Finch?
At about 16 cm long, a purple finch fills a third of a full-frame image at 10 m with roughly 712 mm, or at 20 m with 1,424 mm.
What shutter speed should I use for a Purple Finch?
1/800 s when it's still; 1/2500–1/3200 s for action.
When is the best time to photograph a Purple Finch?
Observations in North America peak in April and May. Early morning and late afternoon give the best light and activity.
Sources & licences#
- iNaturalist — Observation data CC BY-NC; photo licence as credited
- Wikipedia — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources