“what strength is it? uv lenses are avaiable in a number of intensities. what is this filter's intensity?”
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I think strength is a little misleading when referring to an Ultraviolet (UV) filter for camera lenses. UV filters should allow all visible light to pass through the filter, and only filter out light on the Ultraviolet range of the light spectrum. In the past there were certain films that were sensitive to some parts of the UV spectrum, but digital camera sensors are not sensitive to UV rays. It is true that there are two different classifications of UV filters called L37 or L39. L37 filters remove all UV rays in the range of 370nm and shorter, while the L39 filters remove all UV rays shorter than 390nm. Since digital camera sensors are not sensitive to UV rays either type of UV filter will have the same exact effect on the image captured, which is none at all. In fact the only benefit to having a UV filter attached to the front of a digital camera lens is to protect the front lens element, which is a very important thing to do. In all my years none of my SLR/DSLR lenses have ever been without a UV filter attached to the front of each lens. To be honest I don't know if this Rocketfish lens is a L37 or L39 UV filter, but if it is going to be attached to the front of a digital camera lens it makes no difference. Hope this helps!
Sorry, there was a problem. Please try again later.UV filters have no power to them, they block some of the blue light from the sunlight and protect the end glass of the lens. they are clear in color. the glass is flat and have no curve. you must be thinking about "ND" filters they come in different intensities and come in a set of three with numbers of intensities on each one of them for shades of darkness... they work like a pair of sunglasses on your lens. # 2 grey # 4 darker grey #8 almost black.
Sorry, there was a problem. Please try again later.Next to nothing. Used primary for lens protection.
Sorry, there was a problem. Please try again later.It's a UV filter. I don't understand "intensity." It just cuts the UV, really unnecessary with a digital camera that already has perfectly adequate UV cut off in the low pass filter already in place over the sensor. I use it solely for lens protection and it is unnoticeable for visible and IR photography.
Sorry, there was a problem. Please try again later.I know this is old, but I wonder if the question is really about "neutral density" filters and not UV filters. I suppose there could be some different densities of UV filtering, but I tend to think there is mainly just one. In ND filters, however, I do see ones that are like 2x, 4x, etc. These are designed, I think to drop the overall light intensity by a factor of 2, or 4. They are neutral in that they are not supposed to alter colors and I think they can be stacked to some extent to filter out even more light.
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