Sigma 18-50mm F2.8-4.5 DC OS HSM is a Variable aperture Auto Focus (AF)
Standard Zoom lens with Optical Image stabilization and APS-C / DX max sensor coverage, and it is designed to be used with
SA Mount cameras.
What type of photography is the Sigma 18-50mm F2.8-4.5 DC OS HSM lens good for?
The type of photography that you are planning to use the Sigma 18-50mm F2.8-4.5 DC OS HSM is an important decision factor. Here we have evaluated its suitability to various photography scenarios:
Reasons to Buy Sigma 18-50mm F2.8-4.5 DC OS HSM Lens
Here we've included a summary of the advantages and disadvantages of the Sigma 18-50mm F2.8-4.5 DC OS HSM lens in a list form to help you determine whether it offers the features you need.
| Optical Image Stabilization |
| Autofocus |
| Distance Scale |
| Hood supplied |
| Internal Focusing |
| Fast Aperture at Wide end |
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| No Weather Sealing |
| Variable Aperture |
Lens Mount
Sigma 18-50mm F2.8-4.5 DC OS HSM is compatible with cameras that have a Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma SD1 Merrill, Sigma SD1 and .
Sigma 18-50mm F2.8-4.5 DC OS HSM is also available in Canon EF , Pentax KAF3, Sony Alpha and Nikon F (DX) mounts.
Size, Weight and Filter Thread
Size and weight is a very important decision factor when searching for your next lens. Sigma 18-50mm F2.8-4.5 DC OS HSM has a maximum diameter of 74mm and total length of 89mm. It weighs 395g / 13.9 oz.
Sigma 18-50mm F2.8-4.5 DC OS HSM has a filter thread of 67mm. Below are links to the filters that we recommend you to consider for your Sigma 18-50mm F2.8-4.5 DC OS HSM:
Focal Range
Sigma 18-50mm F2.8-4.5 DC OS HSM has a focal range of 18-50mm and 2.8X zoom ratio which has a 35mm equivalent focal range of 27-75mm when used on a APS-C / DX format camera.
Optical Image Stabilization
The Sigma 18-50mm F2.8-4.5 DC OS HSM features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.
Zoom Method
Sigma 18-50mm F2.8-4.5 DC OS HSM features Rotary (internal) zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compared to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.
Maximum Magnification Ratio
Sigma 18-50mm F2.8-4.5 DC OS HSM has a Max Magnification Ratio of 0.24x and has a minimum focusing distance of 0.3m.
Below are the 3 Standard Zoom type Sigma SA mount lens alternatives with highest max magnification ratios:
Aperture
Sigma 18-50mm F2.8-4.5 DC OS HSM is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 18mm, and a max aperture of f4.5 and minimum aperture of f36 at 50mm .
| Focal Length |
Max Aperture |
Min Aperture |
|
18mm
|
F2.8 |
F22 |
|
50mm
|
F4.5 |
F36 |
Optical Formula
Sigma 18-50mm F2.8-4.5 DC OS HSM's optical formula consists of 16 elements in 12 groups . Following special elements are used in this design:
- 2 SLD glass elements
- 3 aspherical elements
Lens Hood
Sigma 18-50mm F2.8-4.5 DC OS HSM comes with a removable lens hood which is handy to reduce lens flare and glare in your photos.
Popular Comparisons of Sigma 18-50mm F2.8-4.5 DC OS HSM
Here are the eight most popular comparisons of the Sigma 18-50mm F2.8-4.5 DC OS HSM amongst Camera Decision readers.
Top Alternatives of Sigma 18-50mm F2.8-4.5 DC OS HSM Lens
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