The Schneider-Kreuznach Retina-Curtagon 1:4/28mm is a 28 mm prime lens for the DKL mount. Here are its field of view on different sensors, hyperfocal distances and the cameras it fits.
Focal length
28 mm
Max aperture
—
Mount
DKL
Designed for
1.53× crop
Field of view by sensor
| Sensor | Diagonal angle of view | 35 mm equivalent |
|---|---|---|
| APS-C (1.5×) | 53.6° | 43 mm |
| Canon APS-C (1.6×) | 51.6° | 45 mm |
| Micro Four Thirds | 42.2° | 56 mm |
Hyperfocal distance
| Focal length | f/2.8 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|
| 28 mm | 14 m | 7.2 m | 5.0 m | 3.7 m | 2.5 m |
Circle of confusion 0.020 mm (sensor size the lens is designed for).
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Schneider-Kreuznach Retina-Curtagon 1:4/28mm equivalent to on APS-C?
It is designed for a 1.53× sensor, giving a full-frame equivalent of 43 mm.