Hence, 35mm lenses are more usable for landscape photography as they require shutting down the aperture to obtain a good sharpness.

Optical path difference (OPD) refers to the difference in the distance that light travels in two different paths, taking into account the refractive index of the medium through which it travels. This concept is crucial in understanding phenomena like interference patterns, where the interaction of light waves can lead to constructive or destructive interference based on their phase differences, which are influenced by the optical path difference. OPD is particularly significant in situations involving thin films, where light reflects off different surfaces and creates patterns based on the varying distances traveled by the light waves.

Opticallenses

In this part, all the lenses have been used for outdoor and indoor shootings with the UV transmitting bandpass filter of Kolari. Now than the theoretical performance has been tested, it is time to evaluate the concrete performance of each lens in term of exposure, contrast and sharpness for UV photography.

Enlarging lenses offer an impressive sharpness for close portraits, despite their rarity and the requirement of a focusing helicoid adapter.

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The 45mm flange distance of M42, plus 35mm from the helicoid gives a minimum flange focus distance of 80mm. We we get infinity focus about 10mm off the stop, plus about 45mm focus throw. Reproduction ratio is about 0.4x.

UltravioletLens Glasses

The indoor test was realized in a studio using professional Broncolor strobes. Contrary to the outdoor test, here the setup is fixed to show the difference of exposure of each lens.

As explained in the presentation of UV photography, not all lenses can be used with UV transmitting bandpass filters because of anti-UV coating applied on their elements. UV-capable lenses can be divided into 3 categories:

UV contactlenses

In this part, an UV torchlight with an inside 365nm Nichia LED is placed in front of a full-spectrum camera. Then a picture for UV photography is taken with each lens tested to show the UV light transmission through it. The parameters are not changing between each shot:

Thin Film: A layer of material that is only a few wavelengths thick, which can create interference patterns due to the reflection and refraction of light at its boundaries.

Flange focus distance on the Nikon EL-Nikkor is 90mm for the original version. The newer one (105mm f/5.6N) has a flange focus distance of 100mm. The new model isn’t as good for UV photography.

Here the Steinheil 50mm F/2.8 appears to have the best performances. Both Nikon D and E have close results with a small advantage for the D version. Finally, the Yongnuo 50mm F/1.8 has the worst theoretical performances.

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Contrary to 35mm lenses, here all 50mm lenses are really close in term of contrast and shooting parameters. These results relativize the previous theoretical comparison as the Yongnuo 50mm lens is offering the same performances than the two Nikon 50mm lenses. The Steinheil 50mm keeps offering the best transmission to reach a much detailed portrait.

For each lens tested, the sensibility was fixed at 1600iso and the aperture was adjusted to obtain the same exposure and the best sharpness for a shutter speed faster than 1/6s. This limitation is the maximum shutter speed allowing neat static portrait using a tripod.

This indoor comparison confirms that all 50mm lenses offer close results and are all usable with studio strobes. While the Steinheil 50mm is still the best 50mm lens.

These 3 categories have one similar point: they are all cheap. Indeed, each UV-capable lens tested in this article will not cost more than 150$, with a mean price of 70-80$. As a comparison, professional dedicated UV lenses made of quartz have the following prices:

The best shot at 35mm is given by the Soligor, which allows the best contrast in the center and the best sharpness. A large amount of vignetting is due to the wide aperture required by the low UV rate.

A change in the phase of a wave, often resulting from reflection or transmission at an interface, which affects how waves combine with one another.

Here, the Optomax and the Soligor have really close performance, while the Nikon has a lower capacity to transmit UV light.

I use a K&F concepts E to M42 adapter with the Fotasy 35-90mm helicoid. The M42 adapter is one with a standard M42 45mm flange distance, and not one of the ultra-thin filters that just adapts the physical mount.

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The soligor has become rather difficult to find in good shape, at least, as of 6/21/22. The one or two I did find seem to be fetching a much higher price tag than 40$ now.

HOW TRADITIONAL CAMERAS WORK. Traditional cameras, also known as film cameras, operate with a chemical reaction. When you take a photo with a film camera, light ...

Interference: A phenomenon that occurs when two or more light waves overlap and combine, leading to patterns of brightness and darkness due to constructive and destructive interference.

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UV lens camera

What helicoid adapter did you use for the Nikon EL 105mm? I just picked one up as well as one of your UV Bandpass filters and I’m having trouble figuring out what adapter I need.

Samyang AF 85mm f/1.4 Nikon F Mount Lens ... Whether you are looking for a specialised macro lens for detailed close-ups, a wide-angle for stunning landscapes, ...

For the outdoor test, a cloudy day in the end of winter was chosen. The UV rate was the lower possible, allowing to use the UV transmitting bandpass filter of Kolari in the worst UV condition. This test shows that even without hard sunlight, UV portrait is still possible. Moreover, it informs about the worst adjustments you would have to do to shoot in UV. This way, you are assured to make better adjustments than those of this test.

To sum up, 50mm is the easiest focal lens to use: it is easy to find an UV capable lens for each camera brand. As a result, when adding a macro extension tube, these 50mm lenses are capable of easily shooting macro photography.

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The meaning of HALF-WAVE PLATE is a crystal plate that reduces by 1/2 cycle the phase difference between the two components of polarized light traversing ...

The goal here is to show the maximum level of UV signal coming on the sensor with the configuration given below. Here are the results: