We know, for Dslr Camera Lens, the aperture is a measure of quality is an important indicator. Large aperture lens quite as good as small lens aperture, score higher. In addition, we often hear a theory called constant aperture lens this also type lens is also seen as a symbol of high-grade lens. So, what is this constant aperture lens?
Your so-called constant lens, means the utmost aperture telephoto end and wide-angle end in the maximum aperture equal on the lens, and is not saying can not change the aperture with the lens. We all know the general zoom lens, aperture wide-angle end and telephoto end with the maximum aperture is not the same. For example, Canon EF-S 18-55mm F3. 5-5. 6 USM, its wide end (18mm side) in the maximum aperture is F3. 5, but the telephoto terminate (55mm side) to become F5. 6 maximum aperture that. However, wide-angle telephoto actually need regarding green large aperture, telephoto than wide angle necessary for a faster shutter pace, so, generally speaking, the telephoto end of the film could be more limited.
Definitely, this type lens has no such problems in the telephoto end can be maintained with a significant aperture wide-angle end with the same, so the version shooting range has increased. At the same time period, all the constant aperture improved lenses are large aperture contact (F2. 8 constant inside majority, there is a little constant F4. 0), the image quality is incredibly good, and in the mechanical properties also have good performance, therefore, a constant aperture lens naturally became a symbol of high-grade lens.
We could think, this type lens image quality fails to in itself will take much benefit, but constant aperture can be a feature of high-quality lens and is the main features. Therefore, we would probably usually use constant aperture lens to represent a type of grade. But, undoubtedly, a constant aperture lens can not be small, light weight, which is forced to make compromises.
Today, I would like to help recommend some “constant aperture” lens back.
This constant aperture lens are good, So I would recommend back.
- Tamron AF 28-75mm f2. 8 SP XR ZL Di LD Aspherical for Canon Digital slr Cameras
- Canon EF 24-70mm f2. 8L USM Standard Zoom lens for Canon SLR Surveillance cameras
- Nikon 80-200mm f2. 8D ED AF Zoom Nikkor Lens for Nikon Dslr Cameras
- Sigma 10-20mm f/3. 5 EX GIRLFRIEND OR BOYFRIEND DC HSM
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What two things will do a photographer want from your medium telephoto, large aperture lens such as the Sigma 85mm f/1. several?
The first may be Low-Light Performance, and the second would be Bokeh.
Why don’t you consider low-light performance? The Sigma supplies in spades.
It has an amazingly wide aperture with f/1. 4 with excellent construction. In fact, it makes the Canon 85mm f/1. 8 lens look and feel like a toy in comparison. The high quality create and excellent glass don’t disappoint, even wide available. Wide open is the concept for the lens’s largest aperture. Many lenses don’t perform well at either end with the aperture spectrum, but this one does. Reviewers report that there’s little or no vignetting or barrel distortion.
What is Aperture? 