* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.
Sigma 28-105mm F/4-5.6 UC II 2-Touch Manual Focus Lens For Olympus OM Mount {58}
Model #239369
* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.
This series of zoom lenses was created to give a lightweight lens that could be wide angle or telephoto or in-between. The focal length rules still apply to zoom lenses. The focal length is for the format the lens was designed for. This focal length is based on 35mm full-frame cameras or digital full-frame cameras. An SLR that uses a lens such as DX or APS-C most be multiplied by a factor to see the actual focal length that comes from using a sensor that is smaller than 24x36 size. If the lens is used with a full-frame SLR, the first number is the widest angle, the second the maximum focal length. If the second is less than 50mm, then it is a wide-angle zoom. If it goes higher than 50mm, it is a wide-angle to telephoto zoom. If the base maximum f/stop is a fixed number, the f/stop range will remain constant throughout the zoom range. If this number is two part, such as f/2.8-f/4, then the lens will only be an f/2.8 lens at the smallest millimeter. This will vary throughout the zoom range and will end at the maximum telephoto at the second f/stop. With a camera that meters through the lens, this change will be automatically adjusted. If you are using a flash that is not coupled to the meter, you must adjust the f/stop to compensate for the change. If not a TTL meter, then this must be adjusted in setting the exposure.
| Brand Name | Sigma |
|---|---|
| Filter Size | 58mm |
| Focus Type | Manual focus (only) |
| Lens Mount | Olympus OM |
| Lens Type | Wide-Angle, Standard / Normal |
| Max Focal Length | 105mm |
| Min Focal Length | 105mm |
