506 m
Hyperfocal distance
253 m
Sharp from (focused at hyperfocal)
207 mm f/2.8
Full-frame equivalent
12°
Diagonal angle of view
Depth of field by subject distance#
135 mm at f/1.8 on APS-C (23.5×15.6 mm), circle of confusion 20 µm. “Background blur” is the size of an out-of-focus light at infinity as a percentage of frame width.
| Focus distance | Near limit | Far limit | Total DoF | Front / behind | Background blur |
|---|---|---|---|---|---|
| 30.0 cm (0.98 ft) | 30.0 cm | 30.0 cm | 0.0 cm | 50% / 50% | 261.12% |
| 50.0 cm (1.64 ft) | 50.0 cm | 50.0 cm | 0.1 cm | 50% / 50% | 118.04% |
| 75.0 cm (2.46 ft) | 74.9 cm | 75.1 cm | 0.2 cm | 50% / 50% | 70.06% |
| 1.00 m (3.28 ft) | 99.8 cm | 1.00 m | 0.3 cm | 50% / 50% | 49.81% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.8 cm | 50% / 50% | 31.56% |
| 2.00 m (6.56 ft) | 1.99 m | 2.01 m | 1.5 cm | 50% / 50% | 23.10% |
| 3.00 m (9.84 ft) | 2.98 m | 3.02 m | 3.4 cm | 50% / 50% | 15.04% |
| 4.00 m (13.1 ft) | 3.97 m | 4.03 m | 6.1 cm | 50% / 50% | 11.15% |
| 5.00 m (16.4 ft) | 4.95 m | 5.05 m | 9.6 cm | 50% / 50% | 8.86% |
| 7.00 m (23.0 ft) | 6.91 m | 7.10 m | 19.0 cm | 49% / 51% | 6.28% |
| 10.0 m (32.8 ft) | 9.81 m | 10.2 m | 39.0 cm | 49% / 51% | 4.37% |
| 15.0 m (49.2 ft) | 14.6 m | 15.5 m | 88.2 cm | 49% / 51% | 2.90% |
| 20.0 m (65.6 ft) | 19.2 m | 20.8 m | 1.57 m | 48% / 52% | 2.17% |
| 30.0 m (98.4 ft) | 28.3 m | 31.9 m | 3.55 m | 47% / 53% | 1.44% |
| 50.0 m (164 ft) | 45.5 m | 55.5 m | 9.95 m | 45% / 55% | 0.86% |
| 100 m (328 ft) | 83.5 m | 125 m | 41.1 m | 40% / 60% | 0.43% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
135 mm at other apertures (subject at 3 m)#
Other focal lengths at f/1.8#
Same lens settings on other formats#
When to use it#
At f/1.8, a 135 mm lens on APS-C is a natural choice for portraits and subject isolation. Focused at 3 m you get 3.4 cm of sharp zone; for maximum front-to-back sharpness focus at 506 m and everything from 253 m to infinity will be acceptably sharp.
See also the f/1.8 aperture guide.
Frequently asked questions#
What is the depth of field of a 135mm lens at f/1.8?
On APS-C, focused at 3 m, it is 3.4 cm; at 1 m it is 0.3 cm.
What is the hyperfocal distance for 135mm f/1.8?
506 m (1661 ft) on APS-C. Everything from 253 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources