Sigma 18mm F/3.5 ZEN
Ultra-wide angle prime lens • Film era • Discontinued
- Announced:
- · September 1992
- Production status:
- ● Discontinued
- Country of design:
- · Japan
- Original name:
- · SIGMA 18mm 1:3.5
- Class:
- · Slow full-frame ultra-wide angle prime lens
- · Professional model
Specification
| Optical design: | |
| 35mm full frame | |
| 18mm | |
| F/3.5 | |
| 10 elements in 9 groups | |
| Internal focusing (IF) | |
| Floating element system | |
| Canon EF [44mm] | |
| Minolta/Sony A [44.5mm] | |
| Nikon F [46.5mm] | |
| Sigma SA [44mm] | |
| 100.5° (35mm full frame) | |
| On Canon EOS APS-C [1.59x] cameras: | |
35mm equivalent focal length: | 28.6mm (in terms of field of view) |
35mm equivalent speed: | F/5.6 (in terms of depth of field) |
Diagonal angle of view: | 74.1° |
| On Sony DSLR-A/SLT-A APS-C [1.53x] cameras: | |
35mm equivalent focal length: | 27.5mm (in terms of field of view) |
35mm equivalent speed: | F/5.4 (in terms of depth of field) |
Diagonal angle of view: | 76.3° |
| On Nikon D APS-C [1.53x] cameras: | |
35mm equivalent focal length: | 27.5mm (in terms of field of view) |
35mm equivalent speed: | F/5.4 (in terms of depth of field) |
Diagonal angle of view: | 76.3° |
| On Sigma SD APS-C [1.74x] cameras: | |
35mm equivalent focal length: | 31.3mm (in terms of field of view) |
35mm equivalent speed: | F/6.1 (in terms of depth of field) |
Diagonal angle of view: | 69.2° |
| Diaphragm mechanism: | |
Diaphragm type: | Automatic |
Aperture control: | None; the aperture is controlled from the camera (Canon EF, Minolta/Sony A, Sigma SA) |
| Aperture ring (Manual settings + Auto Exposure setting) (Nikon F) | |
| 6 (six) | |
| Focusing: | |
| 0.25m | |
| 1:8.5 | |
Focusing modes: | Autofocus (AF), Manual focus (M) |
Autofocus motor: | Micromotor (Canon EF, Sigma SA) |
| In-camera motor (Nikon F, Minolta/Sony A) | |
Manual focus control: | Focusing ring |
Focus mode selector: | AF - M (Canon EF, Sigma SA) |
| None; focusing mode is set from the camera (Nikon F, Minolta/Sony A) | |
Manual focus override in autofocus mode: | - |
| Optical Stabilizer (OS): | |
| - | |
| Physical characteristics: | |
| 355g (Nikon F) | |
| ⌀78.5×57.8mm (Nikon F) | |
| Accessories: | |
| Screw-type 72mm | |
| Bayonet-type petal-shaped | |
| <No data> |
Source of data
- Manufacturer's technical data.
Manufacturer description
The new Sigma AF 18mm F3.5 ZEN. A super-sharp, super-wide, super-performance lens. With a field of view wider than a right angle, it is ideal for expanding your horizons and your point of view. Produces sharp, clear images in its entire shooting range from infinity to a super-close minimum focusing distance of only 9.8 inches (25cm).
- Covers an extended field of view of 100 degrees.
- State-of-the-art floating element system for top performance at all distances.
- Sophisticated internal focusing mechanism for compact design.
- Computer-aided designed optical formula for minimum distortion.
- Whisper-quiet, silky-smooth operation.
- Sigma "ZEN" finish helps prevent scratches and reflections, and gives you a non-slip grip.
From the editor
Introduced at Photokina 1992.
Notes
- The autofocus will not be available with Nikon D40, D40X, D60, D3000-D3500, D5000-D5600 digital SLR cameras.
- Sigma had to reverse engineer the communication protocol of the Canon EF mount to produce a version of this lens for Canon EOS 35mm film SLR cameras. As a consequence, this lens may not work properly with Canon EOS cameras (both film and digital) due to compatibility issues.
Frequently asked questions
What does the Sigma lens designation "ZEN" mean?
It means that the lens has a ZEN finish. ZEN is an acronym for Zeitgeist ("the spirit of the times"), Enhancement, and Nonglare. This nonreflective urethane resin finish was introduced around 1989 and replaced the old-style, painted satin-black finish. Sigma claimed it to be hard, strong, antichemical, nonslip, antiglare, and scratch-resistant, however, it actually had a tendency to peel off and become sticky as it aged.
Lenses with similar focal length
![Sony 20mm F/2.8 [SAL20F28]](https://lens-db.com/wp-content/uploads/2012/07/sony-20-28-01-125x150.jpg)
Comments (1)
I have this lens. Found at a thrift store for $10. The EF version will NOT work on any modern camera. So what can you do? If you do not mind shooting it wide open then get a cheap dumb adapter and use it in manual. Its a fun lens but only for experimental type photography that you will have to shoot in MF.