Additional mirrors in photography

Wide-angle additional mirror and telephoto additional mirror can be added, but the imaging quality will not be good. Wrap the protruding part of the lens with a special outer frame, and the lens is installed on the frame.

With this frame, many lenses can be used.

"Polarizers need to increase exposure several times, which is generally used for large aperture fixed-focus lenses; There are two kinds that cannot be mixed!

The filter to reduce exposure is called grey mirror, which is generally used for large-aperture fixed-focus lenses; "

Correctly speaking, polarizers can be divided into circular polarization (CPL) and linear polarization (PL). The specific principle is huge, so you can find it yourself. At present, most of what you see is cpl, which means that you can make the sky bluer and the grass greener, but in fact you can eliminate the polarized light on the surface of the object, thus restoring the true color of the object. Cpl has some restrictions when it is used. First of all, when the optical axis of the lens forms a 90-degree angle with the sunlight, the effect is the best. Second, it will reduce the two-step exposure, so it needs a larger aperture or a slower shutter. The third is to reduce the image quality.

CPL is expensive and hundreds cheaper. Domestic products can be used and cheap, but the degree of image quality degradation is higher than that of imported ones.

It is medium gray aND nd that reduce the luminous flux. After nd, there are different EV attenuation files according to different values. For example, ND2 means dimming 1 gear, nd4 means 2nd gear and nd8 means 3rd gear. The highest one is nd900, which is used to shoot solar eclipses.

The above two filters are suitable for all kinds of zoom/fixed focus lenses, as long as you can find something corresponding to your lens aperture. I really can't find it, and there is another thing called the connecting ring, which can be matched with lenses and filters with different calibers.

This A-series ring frame is rare. I wonder if there is one in the domestic market. When using, you should first press a release button next to the lens, and then turn it around the reduced part of the lens to take it off. Then install the connecting ring frame and rotate it to fix the direction.