Sigma AF 28-105mm f/4-5.6 UC

The Sigma AF 28-105mm f/4-5.6 UC is a camera glass that can be used with different camera brands. It can focus automatically or manually, giving you flexibility in your photography. It has lens elements that are coated to reduce glare and improve image quality. The manufacturing time of this photographic lens is not mentioned. The aperture of this lens ranges from f/4 to f/5.6, which means it can capture a decent amount of light. The build quality of this glass is decent, but it is not weather-sealed. The resolution of this lens is not specified, but it should be good enough for most photography needs.

Alternatives to this lens could be other zoom lenses with similar focal lengths, such as the Canon EF 28-105mm f/3.5-4.5 USM or the Nikon AF 28-105mm f/3.5-4.5D IF. The bokeh, or the quality of the out-of-focus areas in your photos, is not mentioned.

Positives:
– Great value for the price. It’s an affordable lens that still provides decent image quality.
– Lightweight and compact, making it easy to carry around for everyday use.
– The zoom range is versatile, allowing the lens to be used for a variety of situations from wide angle to short telephoto.
– Decent sharpness throughout the zoom range when stopped down.
– Good color rendition and contrast.

Negatives:
– The lens suffers from distortion at the wide end, especially at 28mm.
– Chromatic aberration is also noticeable in high contrast scenes.
– The build quality feels a bit cheap and plasticky compared to higher-end lenses.

Conclusion:
Overall, the Sigma AF 28-105mm f/4-5.6 UC is a decent budget lens that offers good value for the money. While it has some flaws, such as distortion and chromatic aberration, these can be corrected in post-processing. However, if you’re looking for a lens with better build quality and optical performance, you may want to consider investing in a higher-end model.

Optical design

Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle.

Physical characteristics

With a lens filter diameter of 58 mm commonly filter size, offers a wide range of filter options. 71 mm long, requires consideration if you want to carry in the camera bag. Weights 340 grams so plan ahead, carry only if really necessary.