Quick answer
The Tamron AF 20-40mm f/2.7-3.5 Aspherical is a ultra-wide to standard zoom lens covering 20-40mm at f/2.7 for the Sony A mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
This 20-40mm f/2.7-3.5 wide-angle zoom lens from Tamron fits Sony A mount cameras, with aspherical elements. It covers wide angles for landscapes, interiors and architecture.
Tamron AF 20-40mm f/2.7-3.5 Aspherical specifications
- Brand
- Tamron
- Mount
- Sony A
- Focal length
- 20-40mm
- Maximum aperture
- f/2.7
- Lens type
- Zoom
- Format coverage
- full-frame
- Released
- 1994
- Optical construction
- 15 elements in 12 groups
- Aperture blades
- 6
- Autofocus motor
- in body
- Minimum focus distance
- 0.5 m
- Maximum magnification
- 0.1x
- Filter thread
- 77 mm
- Weight
- 515 g
Specification source: dyxum.com
What can you shoot with the Tamron AF 20-40mm f/2.7-3.5 Aspherical?
At 20-40mm this is a ultra-wide to standard zoom, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
- Landscapes and cityscapes
- Street and travel photography
Its bright maximum aperture handles indoor and evening light reasonably well.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 20–40mm | 48.5–84° | 56.8–94.5° |
| APS-C | 1.5x | 30–60mm | 33.4–61.9° | 39.7–71.6° |
Frequently asked questions
What mount does the Tamron AF 20-40mm f/2.7-3.5 Aspherical use?
It uses the Sony A mount, so it fits Sony A cameras directly.
What is the focal length of the Tamron AF 20-40mm f/2.7-3.5 Aspherical?
It zooms across 20-40mm with a maximum aperture of f/2.7. That makes it a ultra-wide to standard lens.
Is the Tamron AF 20-40mm f/2.7-3.5 Aspherical a prime or a zoom lens?
It is a zoom lens covering 20-40mm, so you can reframe without moving. Its maximum aperture is f/2.7.
What is the Tamron AF 20-40mm f/2.7-3.5 Aspherical equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 30–60mm on full frame, with a 33.4–61.9° horizontal and 39.7–71.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Tamron AF 20-40mm f/2.7-3.5 Aspherical fit?
Any Sony A-mount camera, including Sony A100, Sony A200, Sony A230, Sony A290, and Sony A300 and 24 more.
Alternatives for Sony A from other brands
All Sony A lensesSame mount, overlapping focal range, closest maximum aperture first.
More Tamron lenses for Sony A
All Tamron lenses
Other 20-40mm lenses
Browse by focal length: 20mm lenses, 40mm lenses