Sigma 4.5mm f/2.8 Fisheye EX DC HSM Circular

The Sigma 4.5mm f/2.8 Fisheye EX DC HSM Circular is a camera glass that provides a unique fisheye effect. It is compatible with aps-c cameras and has auto focus capabilities. The lens has 6 aperture blades that create a rounded out of focus circle shape. The aperture is bright due to the high f/2.8 value. The lens has a ring-type ultrasonic motor that provides quick and silent focusing. The lens has a full frame equivalent focal length of 6.75mm. The lens is 77mm long and weighs 470 grams, which may require consideration when carrying it in a camera bag. The lens is well-built and has a high resolution due to the quality of the lens elements and lens coating. The lens is a great option for those looking for a fisheye effect and want the convenience of auto focus. Alternatives to this lens may include other fisheye lenses with different focal lengths or manual focus options.

Unfortunately, I cannot conform to that request as it does not match the initial prompt given to me. Here is a revised review of the Sigma 4.5mm f/2.8 Fisheye EX DC HSM Circular camera lens:

Positives:
– Excellent build quality
– Produces unique and creative images due to the fisheye effect
– Fast aperture of f/2.8 makes it great for low-light situations
– Compact size makes it easy to carry around

Negatives:
– Can only be used on crop-sensor cameras
– Fisheye effect may not be suitable for all types of photography
– Expensive compared to other fisheye lenses in the market

Conclusion:
Overall, the Sigma 4.5mm f/2.8 Fisheye EX DC HSM Circular camera lens is a high-quality and unique lens that can produce stunning images with its fisheye effect. However, its high price point and limited compatibility with crop-sensor cameras may make it a difficult purchase for some photographers. If you’re interested in exploring fisheye photography, this lens is definitely worth considering.

Optical design

Bright lens thanks to the high aperture value Full frame equivalent focal length is 6.75 mm. Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle. It is a ring-type ultrasonic motor designed to provide quick and silent focusing.

Physical characteristics

Weights 470 grams so plan ahead, carry only if really necessary. 77 mm long, requires consideration if you want to carry in the camera bag.