Old Frog is a very famous domestic lens brand, which has many products with special specifications and provides users with many playable shooting artifacts. Today, we got an axis-shifting lens of the old frog just released, the model is the old frog FF S 20mm F4.0 C-Dreamer. This lens is full of playability and rich in adjustment ability, and supports bayonet systems such as Canon RF, Canon EF, Nikon F, Nikon Z, Sony E, Panasonic (Leica, Sigma) L, Pentax PK and Fuji GF, which almost meets most camera systems from SLR to micro-single.

Old frog FF S 20mm F4.0 C-Dreamer shift lens
The price of the old frog FF S 20mm F4.0 C-Dreamer shift lens is 6999 yuan. Compared with Japanese brands, the price competitive advantage of this lens is very obvious. If you want to taste the charm of architectural photography brought by the shift-axis lens, or want to add your own shift-axis lens, then the old frog FF S 20mm F4.0 C-Dreamer is definitely one of the key reference products.
Charm of architectural photography brought by shifting axis lens
Architectural photography is one of a wide range of photographic subjects, but if we shoot with a wide-angle lens, there will be a linear convergence problem caused by perspective. In particular, when we shoot buildings from the perspective of looking up, they are often the gathering shapes of the big and the small. The function of the axis-shifting lens is to eliminate this linear convergence problem, so that the photographed building can still remain horizontal and vertical, and this is the architectural photography effect pursued by professional photographers.

Old frog FF S 20mm F4.0 C-Dreamer real shot sample



Through the sample film, we can see that the old frog FF S 20mm F4.0 C-Dreamer shift lens eliminates the linear convergence problem when we look up and shoot. At the same time, when we were shooting, we still used the shifting bracket. This can better serve the shooting of shifting axis stitching.

When using the shifting bracket, the camera body is moved.
The most traditional way for us to move the camera is to fix the camera body and move the lens to complete the stitching shooting. This time, we used the old frog shift bracket, which is to fix the lens and move the camera body. The advantage of this is that the material photo has no parallax problem caused by the lens and can have a more perfect stitching effect.

Spliced samples taken with shifting bracket

Spliced samples taken with shifting bracket
As you can see, with the shifting bracket, our splicing effect is more perfect. When shooting indoors, there are many and complicated arrangements. With the shifting bracket to move the camera body to shoot, the effect is more perfect, and the stitching is more seamless, and the problem of linear convergence of each item is guaranteed.
Excellent lens optical quality
The old frog FF S 20mm F4.0 C-Dreamer shift lens itself also has excellent optical quality, which can bring us excellent shift samples.

The old frog FF S 20mm F4.0 C-Dreamer takes a real sample, and the red box is the screenshot area.

Zoom in on the screenshot area
It can be seen that the image quality of the old frog FF S 20mm F4.0 C-Dreamer lens is good, the detail storage record is very complete and clear, and the sharpness of the overall picture is also remarkable. Even with high-pixel cameras such as Canon EOS R5 and Fuji medium format, the resolution of the lens is excellent and can be perfectly adapted.

Backlight performance in extreme shooting environment
The backlight performance of the old frog FF S 20mm F4.0 C-Dreamer is good. Our shooting environment is a very extreme backlight environment, and the ghost in the picture is relatively slight. Glare and star glare are also the effects of the lens in the most extreme shooting environment. Generally speaking, it is no problem for us to use the old frog FF S 20mm F4.0 C-Dreamer lens for backlight shooting.

The lens hood can rotate 360 degrees.
In addition, because the hood of the old frog FF S 20mm F4.0 C-Dreamer lens itself can rotate 360 degrees, we can dynamically avoid many scenes that may produce ghost images.

Real shot sample of old frog FF S 20mm F4.0 C-Dreamer


The color reproduction performance of the old frog FF S 20mm F4.0 C-Dreamer lens itself is also excellent, which can bring very real reproduction effect to our daily shooting environment. The improvement of optical quality, resolution and color performance shows that the manufacturing technology and coating technology of the old frog lens are constantly improving, and the old frog lens is also leading the domestic lens to keep advancing.
Rich adjustment ability
Finally, let’s take a look at the rich adjustment ability of the old frog FF S 20mm F4.0 C-Dreamer lens.

Axis shifting adjustment of old frog FF S 20mm F4.0 C-Dreamer
The axis shifting adjustment of the old frog FF S 20mm F4.0 C-Dreamer lens is very simple, with a special adjusting ring, similar to the shape of the focus ring, and the axis shifting adjustment can be completed only by twisting. In addition, the lens is designed with a locking knob, which can prevent us from causing unnecessary damage to the lens during carrying.

Rotation of old frog FF S 20mm F4.0 C-Dreamer
Old frog FF S 20mm F4.0 C-Dreamer lens In order to make it convenient for everyone to take pictures of shifting axes at various angles or splicing materials, the lens provides rotation operation. Just press the switch to make the lens rotate. The rotation is limited every 15 degrees, and there is an angular scale on the lens, so you can see at a glance what direction you rotate.

The old frog pivot bracket also supports 360-degree rotation.
In addition, the shifting bracket of the old frog can also support 360-degree rotation operation. It is also designed with a scale, which angle the user can see very clearly.
The operation of the hood has just been introduced, so I won’t repeat it here.
The old frog FF S 20mm F4.0 C-Dreamer shift lens is very playable, the lens itself is excellent in workmanship, the overall use experience is also excellent, and it is also very convenient to use. The design and damping of the focus ring and aperture ring are good, and it is easy to use and feels excellent. The optical quality of the lens exceeds our expectation, and the architectural photographs we took are very satisfactory. We can see that the old frog lens has made remarkable progress in recent years. The price advantage of the lens itself is obvious. If you want to try the off-axis lens, or experience better architectural photography, and the budget is tight, then the old frog FF S 20mm F4.0 C-Dreamer is your first choice.
More samples of the old frog FF S 20mm F4.0 C-Dreamer lens:

