초점 거리, 조리개, 센서 크기, 초점 거리에 따른 과초점 거리와 허용 가능한 선명도의 근/원 한계를 확인하세요. 풍경 사진에 이상적입니다.
| 조리개 | 과초점거리 | 근접 한계 | 원거리 한계 | 전체 피사계심도 |
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과초점거리 H = f² / (N × c) + f, 여기서 f = 초점거리, N = 조리개값, c = 착란원(circle of confusion)입니다. 근접 한계 = (H × s) / (H + (s − f)). 원거리 한계 = (H × s) / (H − (s − f))이며, 음수이면 무한대를 의미합니다.
과초점거리에 초점을 맞추면 피사계심도가 최대가 되어, H/2부터 무한대까지 모두 선명하게 보입니다.
Hyperfocal distance is computed as H = f squared / (N x c) + f, where f is focal length, N the f-number and c the circle of confusion for your sensor. Near and far limits come from the standard depth-of-field pair: near = (H x s) / (H + (s - f)) and far = (H x s) / (H - (s - f)), with s your focus distance. When that far denominator falls to zero or below, the tool prints infinity.
The Sensor (CoC) dropdown is the setting most people overlook, and it feeds c directly: 0.030 mm for full frame, 0.020 mm for APS-C Nikon / Sony, 0.019 mm for APS-C Canon, 0.015 mm for Micro Four Thirds, 0.011 mm for 1-inch, plus 0.038 and 0.044 mm for medium format. Focal length, aperture and focus distance default to 24 mm, f/8 and 3 m, switchable to feet.
Circle of confusion is a convention rather than a measurement. These values work out to roughly the sensor diagonal divided by 1,440, which assumes a modest enlargement viewed at a normal distance. Pixel-peep at 100% and your usable depth of field will be noticeably shallower than the table suggests. The comparison rows also run f/2.8 through f/22 whether or not your lens offers them, and diffraction is not modelled, so the gain at f/22 is overstated.
Focus at the hyperfocal distance shown and everything from half that distance to infinity falls within the acceptable-sharpness limits. At the default 24 mm, f/8, full frame, that means focusing about 2.42 m away for sharpness from roughly 1.21 m onward.
Once your focus distance reaches or exceeds the hyperfocal distance, the far limit is unbounded. The tool detects that H - (s - f) has dropped to zero or below and prints the infinity symbol rather than an implausibly large number.
The presets are 0.020 mm for Nikon and Sony APS-C and 0.019 mm for Canon APS-C, reflecting their slightly different sensor sizes. Smaller sensors take a smaller circle of confusion because the captured image must be enlarged more to reach the same print size.
The table shows depth of field still growing at f/22, but it does not model diffraction, which softens the entire frame at small apertures. On most modern lenses f/8 to f/11 is the practical limit before diffraction cancels out the extra depth.
No. Focusing at infinity throws away the near half of your available depth of field. Focus at the hyperfocal distance instead and you keep infinity acceptably sharp while gaining everything from half the hyperfocal distance forward, which the tool shows for you.
Crop Factor & Equivalent Focal Length Calculator
Convert focal length and aperture between sensor sizes — Full Frame, APS-C, M43, 1" and medium format.
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Calculate equivalent exposures across aperture, shutter speed and ISO with reciprocal stops.
