Why do you want to buy a movie?

In landscape photography, 72mm, 77mm and 82mm are the most common lens groups in Quan Huafu. These lenses are most suitable for the square filter system of100 mm x100 mm+000 mm. Compared with the ring filter directly connected to the lens, the square filter system has the following advantages:

First, multiple lenses can be adapted at the same time. In addition to the super wide-angle lenses with bulb shapes such as Tamron15-30mm2.8 and Nikkor 14-24mm F2.8, a larger 150mmx 150mm system is needed. As long as the adapter ring corresponding to the lens aperture is used, different square filter systems can be connected.

Second, there are no dark corners. When using ring filters or other filters, dark corners will be formed around the screen because the aperture or size of the filter is too small. Some dark corners are just vignettes, but some dark corners cannot be removed because the filter box blocks the four corners of the screen.

Thirdly, the square filter system can easily realize filter combination. Whether it is a medium gray gradient mirror with antireflection mirror, an antireflection mirror with polarizer, or a light protection filter with antireflection mirror. The square filter system is much more flexible than other filter systems.

Common filter combinations

The most commonly used combination of landscape photography should be CPL polarizer and dimming filter. CPL polarizer is a kind of filter whose ability is often underestimated: when shooting a scene with reflection or specular reflection (such as the reflection of a smooth mirror of a building or a calm water surface), adjusting the polarizer to filter out the incident light in a certain direction can effectively strengthen or remove the reflection and highlight the key points of the picture you want to express.

In addition, in the shooting of urban night scenes, in order to prolong the exposure time in the evening and reduce the negative impact of urban artificial light sources on shooting, the combination of six-segment dimming filter and light loss prevention filter can also be used.

Haida 100 series NanoPro reducer Nd3.0 (file 10).

Haida 100 series NanoPro night vision glasses

Sealing-the primary consideration standard of filtration system

The first factor in evaluating dimming filters and filtering systems is compactness. Six to ten times the long exposure. A slight light leakage will cause serious damage to the image quality. Slight light leakage may be difficult to detect when shooting, but once the brightness is properly improved in the later software, the invisible light leakage (usually magenta in the middle of the picture) will seriously affect the picture.

The cube 100 system of Haida University consists of a filter ring, a filter holder and a lens. No light leakage was found when using the reducing mirror.

Glare resistance

A good dimming filter should not add extra glare to the picture except the glare when the lens faces the direct glare or the oblique glare. Neither of Haida's two filters found any additional lens glare when used.

(No filter, example of lens glare)

(Glare does not increase after adding a filter)

Ease of use and durability

The time required for each installation of the filtration system and the firmness of the installation are very important indicators of the filtration system. The annular adapter ring installed on the screw is easy to install, and the accuracy and stability can be guaranteed.

Adapter parts for filter clips and adapter rings can also be quickly installed. Finally, install the filter bracket with the adjusting screw. As long as the operation is skilled, the whole installation process can be completed in one minute.

I tried to install my Nikkor 16-35mm F4 lens (77mm caliber) and Sigma 24mm F 1.4 lens (77mm caliber), but I didn't find any installation difficulties due to tolerance and poor workmanship during the whole process. In addition, the material of the whole filtration system is also very important, and good materials are in place to protect the deformation after impact and fall.

The filter bracket with poor material is easy to be installed or disassembled due to accidents such as falling. Haida's filtration system is made of plastic only where the filter clip contacts the filter screen (to prevent scratching the surface of the filter screen), and other parts are made of solid materials, which is very solid as a whole.

What needs to be added is that for photographers who have installed more than two filters, the filter system provided by Haida can install a third slot through additional accessories, which also adds points to ease of use.

The portable packaging of the integral filtration system is a simple nylon cloth bag, which is light, simple and practical. However, the original packaging of the filter lens is an iron box. If you pursue portability, you may need to buy a protective bag for the filter.

Practical guide to reducing mirrors

The function of subtracter is to prolong and flexibly control the exposure time on the premise of ensuring the image quality of camera. The camera image quality assurance mentioned here refers to the parameters that can ensure the image quality in most landscape photography: adjust the aperture to F4-F 1 1, and control the sensitivity to ISO 100 (or below) to ISO320. If the aperture is too large or too small, the picture definition will decrease due to the depth of the scene or diffraction effect.

In my practical experience, the six-speed reducer and the ten-speed reducer are most needed. When the light starts to dim at sunrise and sunset, the sixth-order lens (the number at the top of the filter is 1.8) is most useful, which allows the photographer to extend the shutter time to about 30s at the longest.

(No filter)

(using Haida 100 series NanoPro ND 1.8)

For sunny environment and most sunny conditions, the exposure time can be effectively extended by choosing a ten-stage decompressor, and it can be flexibly controlled within a certain range.

(No filter)

(using Haida 100 series nano Pro ND3.0)

But under the strong light at noon or during the day. Even with 10 step-down lens, under the conditions of ISO 100 and F 1 1, the exposure time can only be extended to 5s or even shorter. In this case, it is not recommended to use multiple reduction lenses to extend the exposure time, but to simulate the effect of long exposure by post-superposition.

The image quality of multi-reduction lens is more attenuated, and improper operation or improper sealing is more likely to lead to light leakage. Moreover, the bright contrast of objects in strong light environment is large, and even through the reduction mirror, the bright contrast of the environment can not be reduced to make the picture softer.

Film appreciation

16-35mm f/4.0, 30s, f/9, ISO 250

(using Haida 100 series NanoPro ND 1.8)

16-35mm f/4.0， 15s，f/ 13，ISO 100。

(using Haida 100 series NanoPro ND 1.8)

16-35mm f/4.0，25s，f/ 10，ISO 100。

(using Haida 100 series NanoPro ND 1.8)

24 mm f/ 1.4, 6 seconds, f/ 10, ISO 100.

(using Haida 100 series NanoPro ND 1.8)

16-35mm f/4.0， 15s，f/9，ISO 100。

(using Haida 100 series NanoPro ND 1.8)

16-35mm f/4.0, 20s, f/8, ISO 125.

(using Haida 100 series nano Pro ND3.0)

16-35mm f/4.0， 1/ 125s，f/9，ISO 100。

(using Haida 100 series nano Pro ND3.0)

Ps: The uploaded pictures are somewhat degraded. Please forgive me for the inconvenience, crab crab ~