The maximum possible rating for this lens is five stars. In terms of value for money (Elks are far more expensive than other animals), it is the best option in the 20-30 mm size range. In favor are: 1) Superb color accuracy; you'll notice the difference while using a zoom lens (only Elks can compete, but they also have a corresponding price). 2) The lens is noticeably sharper than the Canon EF 50 f/1.4 USM (with the same aperture) and is nearly as good as it gets. 2) Many aperture blades for a pleasing bokeh effect. Thirdly, beginning at an aperture of f/1.8, bokeh may be varied widely, allowing, for instance, for the backdrop to be blurred even when it is relatively close. A relatively tiny aperture value (below f/1.4) is required for such a focal length. Landscapes and full-length portraits using a universal lens, no. 4. 5) The cheapest light filters are those that are less than 58 millimeters in diameter. In addition to protecting against dust and moisture, internal focusing also improves optical geometry, leading to fewer aberrations. 7) This lens has relatively low levels of chromatic aberration at these aperture settings. One drawback is that 1) a lens hood, which is essential for glare reduction and damage prevention, is not provided. 2) The physical aperture is still narrow, even when compared to the thread diameter for 58 mm filters (not to be mistaken with the aperture as a result of the aperture value), which degrades image quality in challenging lighting circumstances and when seen at 100% scale on high-megapixel matrices. More light is gathered and better optical resolution is achieved with larger diameter glasses.
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