Sigma 135-400mm f/4.5-5.6 APO Aspherical

The lens has aspherical elements which help to reduce distortion and increase sharpness. The lens also has APO (Apochromatic) glass which helps to reduce chromatic aberration. The lens has a good build quality and is made to last. The lens has a variable aperture which means that the maximum aperture changes as you zoom in and out. The lens has a good resolution which means that your photos will be sharp and detailed. The lens has a good bokeh which means that the out of focus areas will be smooth and pleasing to the eye. The lens is available in different mounts which means that you can use it with different camera brands. There are alternatives to this lens from other manufacturers which offer similar features. The lens is suitable for wildlife, sports, and other types of photography where you need a long reach. The lens has a good autofocus system which means that it will focus quickly and accurately. The lens also has a manual focus option which means that you can adjust the focus manually if you prefer. The lens has a good lens coating which helps to reduce flare and ghosting. The lens is made by Sigma which is a well-known manufacturer of photographic lenses. The lens takes time to manufacture as it is a complex piece of equipment.

Positives:
The Sigma 135-400mm f/4.5-5.6 APO Aspherical camera lens is an excellent choice for those on a budget. It is priced competitively and offers a good range for outdoor photography, especially for wildlife. The autofocus is fast and accurate, making it a pleasure to use in challenging shooting situations. Overall, I found this lens to be a reliable performer, providing sharp and detailed images.

Negatives:
One negative aspect of this lens is its weight. At times, it can feel bulky and cumbersome, making it difficult to carry it around for extended periods. Also, the aperture range is not as wide as some of its competitors, which could be a problem in low-light conditions.

Conclusion:
Overall, I think the Sigma 135-400mm f/4.5-5.6 APO Aspherical camera lens is an excellent value for the money. It’s well-built, produces good quality images, and offers a decent range for a budget telephoto lens. While it does have some downsides, these are relatively minor in the grand scheme of things. If you’re on a tight budget and looking for an affordable telephoto lens, this one is definitely worth considering.

Optical design

Has 9 aperture blades, with this amount of aperture blades you will be satisfied with the result. Great choice mainly for good light conditions

Physical characteristics

Weights 1245 grams so it is a heavy lens, consider using its own lens bag. 181 mm long, with this size carry only if you use it. With a lens filter diameter of 77 mm this lens deserves a good quality filter, this is commonly filter size, provides a range of filter options.