Large aperture humanistic lens Seven craftsman M28mm F1.4 trial experience
This article comes from Jiayou Online
The 28mm focal length lens is a very familiar and commonly used lens for people who love humanistic photography. Moreover, it is a unique focal length, and it is also difficult to use. People who like it will like this focal length very much. For example, the famous Ricoh GR series digital cameras use 28mm lenses, which have a large number of loyal fans. Compared to another commonly used focal length of 35mm in humanistic photography, 28mm has a larger depth of field, which brings a stronger sense of perspective. This article will introduce such a 28mm lens, Seven Craftsman M28mm F1.4.
Seven Craftsman M28mm F1.4 is a Leica M mount lens, Leica original factory also has the same specification SUMMILUX-M 28mm f/1, 4 ASPH. But undoubtedly, the Seven Craftsman M28mm F1.4 is more cost-effective, and it is also more suitable for use in full-frame mirrorless digital camera bodies such as Sony, Canon, Nikon, and Panasonic.
In order to build this M28mm F1.4, seven craftsmen used a double-sided aspheric glass, two ED glass, three high-fold rare earth glass, a total of 11 optical elements in 9 groups. The glass lens makes full use of the material selection characteristics of each piece of glass as much as possible. The image quality from the center to the corners has excellent performance. It explains that such an environmental portrait lens can easily be used in a small and dim indoor environment. Get ample angle of view and amount of light, and even record streets and buildings at night.
Schematic diagram of lens structure
lens MTF curve Figure
Introduction to the appearance of
Seven Craftsman M28mm F1.4 Mirror Body
Seven Craftsman M28mm F1.4 Mirror Body is made of all metal material and weighs about 488g. The lens body is equipped with an aperture ring, focus ring, distance scale and depth of field indicator scale. The overall size of the lens is moderate, and the damping feel of the aperture ring and focus ring are good. This is very important for a manual focus lens.
七工工M28mm F1.4 Coating
In terms of lens structure, Seven Craftsman M28mm F1.4 uses a design of 11 elements in 9 groups, including one double-sided aspheric glass, two ED glass, and three high-fold rare earth glasses. , It makes full use of the material selection characteristics of each piece of glass as much as possible, so that the image quality of the lens imaging from the center to the corners has an excellent performance. The lens filter size is 52mm, and the closest focusing distance is 0.7m.
七工工M28mm F1.4 aperture
Seven craftsman M28mm F1.4 aperture is a circular aperture composed of 13 aperture blades, the maximum aperture is F1.4, the minimum aperture is F16.
七工工M28mm F1.4 bayonet
Seven Craftsman M28mm F1.4 adopts metal bayonet, which is sturdy and durable. The brass area is used for lens focus shift adjustment.
Next, we will test the resolution of the Laohuaqi Artisan M28mm F1.4 in the actual scene. The entire scene has a rich level of detail, and the frontal composition is also used to ensure that the edge of the picture can also be in focus, so as to better reflect the resolution of the edge and be relatively objective.
Schematic diagram of interception area
resolution test Comparison table
Through the comparison, we can see that the various apertures in the center of the screen of the Seven Craftsman M28mm F1.4 lens perform well, and the image quality is the best when the aperture is F4. The resolution of the edges is reduced relative to the center, and the best aperture is also at F4.
vignetting test table
Through the real shooting test, we can see that the Seven Craftsman M28mm F1.4 has always had obvious vignetting, and it is not obvious with the reduction of the aperture Therefore, you need to pay more attention when shooting. However, in actual shooting, if you can consciously use the vignetting, you might get unexpected effects.
In terms of distortion control, Seven Craftsman M28mm F1.4 performed fairly well, only the center of the test screen only has relatively slight barrel-shaped distortion, so you don’t need to pay too much attention when shooting. .
As a lens suitable for humanity sweeping street shooting, the Seven Craftsman M28mm F1.4 is very good in terms of volume and is very suitable for use as an on-hook lens. At the same time, as a Leica M mount lens, the optical performance of the Seven Craftsman M28mm F1.4 is definitely incomparable with the original factory, and compared to the Leica camera, the Seven Craftsman M28mm F1.4 is more suitable for mounting the ring Used on Japanese full-frame mirrorless lenses, for these users, this is a large-aperture humanistic lens that can be experienced without too much price.
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