Zeiss Interlock Compact 2.8/21 (M42-mount) 21mm F2.8 Manual Focus & Iris M42-Mount Compact Type Lens, 43.3mm Image Circle, 42 Megapixel Rated
$1,783.00
| Focal length | 21 mm |
| Aperture range | f/2.8 – f/22 |
| Number of elements / groups | 11 / 9 |
| Min. working distance (object to sensor) | 250 mm (0.82 ft.) – ∞ |
| Min. free working distance | 160 mm (0.52 ft.) – ∞ |
| Angular field* (diag. / horiz. / vert.) | 91 / 81 / 59° |
| Max. diameter of image field | 43.3 mm (1.7") |
| Flange focal length | 18.0 mm |
| Coverage at close range | 281 x 187 mm (11.0 x 7.3"), line 319 mm (12.5”) |
| Image ratio at close range | 1:7.81 |
| Filter-thread | M 52 x 0.75 |
| Weight | 448 g (1.0 lbs.) |
| Camera mount | M42 (18.0 mm FFD) |
