During a discussion at a meeting of photographers in the United States, Roger Cicala, photographer, writer and columnist, raised a question about the usability of the UV filter and how it can sometimes damage the result.
Cicala shows the before and after tests performed between a lens without filter and showing the difference in images, then talks about the differences between filters that use optical glass and simple glass. It tested several models of UV lens filters for DSLR cameras and the results showed sharper and better illuminated images in some cases where the filter was not needed. Isn’t that a surprise? Cicala is known for his meticulous tests and for taking off his glasses, so it’s safe to say she knows what she’s talking about here.
- Some images showed color variations.
- Many aberrations and low contrast.
- As in environments with adequate lighting the filter retained more light.
- Although the sharpness was the same in all tests.
- But is that enough to make it worth not using filters?.
The answer to this question is NO, of course, but your story still had repercussions to generate a great debate about UV filtering: do you still use or can it affect your photos?As demonstrated in your tests, lens filters where there are already good light conditions, their use becomes useless and the absorption of “useful light” can reduce the intensity of colors and increase reflections.
Below are some comparisons of enlarged images, taken with different models and brands of UV filters that Cicala has published on its page.
Another important point addressed by him was the durability of the filters and the quality of the material used, many unknown brands have used good optical lenses in the construction of the UV filter, while other more famous ones are only ordinary lenses, and this harms the user, because optical glass is specially built to properly treat UV rays , with the exception of such rays only. In excess, the most common already had variations to prevent the entry of common white light, obscuring images for example.
In addition, filters made of this material are not resistant and can scratch the front of your lens instead of protecting it. After checking the optical material of the glass, also check the elastic ring, if it is aluminum and polished, so as not to scratch the material.
In short, common sense prevails. It is necessary to have experience and care when choosing and using the UV filter, respecting the lighting conditions of the environment in which you are and your photographic equipment!