Diffuselight vs direct light

The light can reflect off of objects and surfaces, as well as be absorbed by certain materials. As it travels through space, light waves oscillate in multiple planes. However, a CPL filter is designed to ensure that light waves only oscillate in one plane, which allows for improved clarity and reduced glare. Additionally, the direction and degree of polarization can be adjusted by rotating a polarizer lens filter.

Check out our range of polarizer filters for camera lenses and find the best one for your need to level up your pictures.

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Coaxial illuminations are perfect for highly reflective materials which have a relatively flat surface. They are very homogeneous, but rather directed and produce contrast at edges and greater curvatures.

Absolutely. Some of the CPL filters are stackable, so you can get creative by combining them with other filters. It’s common to combine a polarizer with an ND filter for shooting water bodies. However, you can combine them with other filters as well.

Diffuse light is necessary for many applications, as soon as reflective, polished, glossy or metallic objects must be tested. It is particularly difficult if these surfaces are no longer perfectly flat, but individually shaped, wrinkled, curved or cylindrical.

Diffuselight Ceiling

The further the light is away, the more the soft illumination by means of the little stray light gets lost and the light becomes more and more directed. Bevels, engravings and errors, etc. which represent a no longer perfectly planar surface are still more emphasised.

The advantage of this lighting design is the "view" through the light source (in this case the mirror). The image as a whole looks very homogeneous and has only a general linear loss of light, the further the mirror moves away from the lamp. Tip: In order to avoid inhomogeneities, the illumination must be clearly larger than the area to be inspected.

Diffused light architecture

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Not only! While polarizing filters are highly effective in landscape photography, they can also be used indoors to reduce reflections on glass surfaces or enhance colors in certain lighting conditions.

This type of lighting couples light into the optical path from the side (coaxially). This is done with the help of a semi-transparent mirror which is illuminated sidewards and casts light downwards on the test object. The object reflects the light which reaches the camera through the semi-transparent mirror.

Only a dome light is able to produce truly diffuse light, avoiding reflections on the component to the greatest extent. Due to the homogeneous incidence of light from all spatial directions, irregularities and scratches are also illuminated very softly, uniform material appears homogeneous.

Diffuselight example

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To determine the correct size for your polarizer filter, check the diameter marked on your camera lens. It is usually imprinted near the front of the lens or mentioned in the lens specifications. Choose a CPL filter with the same diameter to ensure a proper fit. If you plan to use a polarizer filter on a camera lens of different diameters, take the filter matching the diameter of the biggest filter.

While you can leave a polarizing filter on your camera lens, it's important to note that the filter may reduce the amount of light entering the lens, particularly when fully polarized. Consider removing the CPL filter in situations where maximum light intake is crucial in poorly lit environments. Otherwise, you can keep the CPL filter on to benefit from reduced glare and enhanced colors in various shooting scenarios whenever it´s the effect that you want to get.

Diffuselight in computer graphics

These images typically appear rather "featureless". Reflections, shadows, surface irregularities, scratches, etc. are suppressed. Up to a surface angle of almost + / - 45 degrees, structures are illuminated uniformly. Other materials and components with different colours are clearly visible only now.

Diffuselighting Photography

Not every "diffuse" light source is truly diffuse. Here a direct comparison of the above-mentioned lighting types. An almost perfect reflection-free illumination is only achieved using dome illumination.

If you want to illuminate a test object as diffusely as possible, it is usually necessary to choose a small working distance. With increasing distance, the light source appears more direct. The consequence is a smaller illuminated solid angle. Stronger object curvatures are no longer illuminated.

Diffuselight bulb

Circular Polarizer (CPL) filters reduce reflections and light reflections from non-metallic surfaces. They can significantly help to improve the quality of photos:

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For cleaning a polarizer camera filter, use an air blower or a soft brush to remove any loose particles. If smudges or fingerprints persist, use a microfiber cleaning cloth or cloth dampened in distilled water. It’s important to avoid using abrasive materials that could scratch the filter or chemicals since they can damage the filter.

In the easiest case, a simple incident light illumination can be equipped with a diffuser, e.g. an LED ring light with diffusing panel. In this way, the directed light can be homogenised slightly better. Individual LEDs, for example, are no longer discernible on a reflecting material. The light, however, is still quite strongly directed and mainly comes from the direction of the illumination.

Diffused Light for Room

Attach the polarizer filter onto the front of your camera lens: simply screw it in or attach to the adapter ring. Once attached, rotate the outer ring of the CPL filter to achieve the desired effect. If you are using one of our filter holders, rotate the corresponding wheel on the holder. Experiment with the rotation to minimize reflections and optimize color saturation based on your shooting conditions.

Variations of this illumination are only slightly arched lights that can illuminate a much smaller solid angle. Tunnel-like dome illuminations have an elongated dome shape and are ideal for illuminating cylindrical objects.

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Rule of thumb: The closer the better, if you want to use the somewhat diffuse nature of the lighting in order to achieve soft illumination!

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Coaxial lighting, just like dome lights, must be very close to the object in order that the diffuse stray light can illuminate the surface very homogeneously. The longer the working distance, the more directed is the light; notches, scratches, etc. in the surface become more and more clearly visible again.

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