28mm f/2.5 Adaptall-2

28mm
f/2.5
Prime
180 g
Min focus 0.25 m

Quick answer

The Tamron 28mm f/2.5 Adaptall-2 is a wide-angle prime lens covering 28mm at f/2.5 for the Olympus OM mount. Its bright maximum aperture handles indoor and evening light reasonably well.

About this lens

A 28mm f/2.5 manual-focus wide-angle prime lens, the Tamron 28mm f/2.5 Adaptall-2 is designed for Olympus OM mount bodies. The wide view suits landscapes, architecture and environmental shots.

Tamron 28mm f/2.5 Adaptall-2 specifications

Brand: Tamron
Mount: Olympus OM
Focal length: 28mm
Maximum aperture: f/2.5
Lens type: Prime
Format coverage: full-frame
Released: 1979
Optical construction: 7 elements in 7 groups
Autofocus motor: none
Minimum focus distance: 0.25 m
Filter thread: 49 mm
Weight: 180 g
Length: 37.5 mm
Diameter: 64.5 mm

Specification source: en.wikipedia.org

What can you shoot with the Tamron 28mm f/2.5 Adaptall-2?

At 28mm this is a wide-angle prime, which typically suits:

Landscapes and cityscapes
Street and travel photography
Environmental portraits and interiors

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 (adapted mount, so sensor size depends on your camera). Not measured.

Sensor	Crop	Equivalent	Horizontal FOV	Diagonal FOV
Full frame	1.0x	28mm	65.5°	75.4°
APS-C	1.5x	42mm	46.4°	54.5°
Micro Four Thirds	2.0x	56mm	35.6°	42.2°

Try the field-of-view calculator

Frequently asked questions

What mount does the Tamron 28mm f/2.5 Adaptall-2 use?

It uses the Olympus OM mount, so it fits Olympus OM cameras directly and can be used on other systems through a mount adapter.

What is the focal length of the Tamron 28mm f/2.5 Adaptall-2?

It is a fixed 28mm lens with a maximum aperture of f/2.5. That makes it a wide-angle lens.

Is the Tamron 28mm f/2.5 Adaptall-2 a prime or a zoom lens?

It is a prime lens with a fixed 28mm focal length. Primes usually open wider than zooms; this one opens to f/2.5.

What is the Tamron 28mm f/2.5 Adaptall-2 equivalent on a crop sensor?

On APS-C (1.5x crop) it frames like 42mm on full frame, with a 46.4° horizontal and 54.5° diagonal field of view. On Micro Four Thirds (2x crop) it frames like 56mm on full frame, with a 35.6° horizontal and 42.2° diagonal field of view. These figures are calculated from the focal length and crop factor.