The Mamiya/Sekor SX 55mm f/1.8 is a 55 mm prime lens with a maximum aperture of f/1.8 for the M42 mount. Here are its field of view on different sensors, hyperfocal distances and the cameras it fits.
Focal length
55 mm
Max aperture
f/1.8
Mount
M42
Designed for
Full frame
Field of view by sensor
| Sensor | Diagonal angle of view | 35 mm equivalent |
|---|---|---|
| Full frame | 42.9° | 55 mm |
| APS-C (1.5×) | 28.8° | 84 mm |
| Canon APS-C (1.6×) | 27.6° | 88 mm |
| Micro Four Thirds | 22.3° | 110 mm |
Hyperfocal distance
| Focal length | f/2.8 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|
| 55 mm | 36 m | 18 m | 13 m | 9.2 m | 6.4 m |
Circle of confusion 0.030 mm (sensor size the lens is designed for).
Cameras that fit (2)
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Mamiya/Sekor SX 55mm f/1.8 equivalent to on APS-C?
About 82 mm (1.5×) or 88 mm on Canon APS-C (1.6×).
Which cameras is the Mamiya/Sekor SX 55mm f/1.8 compatible with?
It fits KMZ Zenit 122, KMZ Zenit 412LS (see the full list above).