UV filter absorbs the ultraviolet radiation which is usually the main cause of a hazy and unclear photograph in exterior. This UV filter is multipurpose and it is suitable for a colorful as well as for a black and white photograph. The filter also protects the lens constantly against water, grease and scratching.
UV VFFOTO filters marked like as TITANIUM GOLDEN SERIES are devoloped, designed and completed in the Czech Republic. The components are being produced in China
Not only that they are equipped with 14 antireflective layers (7 on each side) but also they contain new 3+3 nanolayers with the most developed functions: improved resistance to scratching, water-resistance, improved resistance to grease, easier cleaning.
All of the filters in this series are produced using the first-class optical glass Schott N-BK7 (more information about this glass can be found here).
UV filters of this series are designated especially for digital cameras, but they can be also used for classical cine film reflex cameras.
For the reason custom - made filter, delivery time is 3-5 working days.
| used glass | optical glass Schott N-BK7 |
|---|---|
| average transparency | 99.63% (max. value 99.9%) |
| material of the frame | titanium |
| thickness of the glass | 0.9 mm +/- 0.1 mm |
| height of the frame after screwing | 3.4 mm - slim |
| number of antireflective layers | 14 (7+7) |
| nanolayers | yes |
| weight of the filter | 23 g |
| use of ordinary lens cap | yes |
| rear thread | M 82 x 0.75 mm |
| frontal thread | yes |
Why you should decide for the VFFOTO GS UV filter:
1. 14 (7+7) antireflective layers of high quality = the minimization of objectionable reflections,
2. closing external treatment of the filter using nanolayers = resistance against water, scratching and impurities, these layers improve the mechanical as well as the physical qualities of the glass Schott N-BK7,
3. original optical glass of high quality = it preserves even the finest details of the contours without having an impact on sharpness,
4. high transparency of the glass up to 99.9% = minimization of the loss of the light,
5. low design titanium frame = it provides no vignetting, it can be used with the ordinary lens cap, it is suitable for wide angel lenses as well as for telephoto lenses, titanium properties (hardness, very low weight, high durability) allow it to be used in the aerospace and space industry, neurosurgery, dentistry and orthopaedics; it is also used for the production of luxury wrist watches and jewelry and golf clubs and also for VFFOTO photographic filters for their trouble-free replacement on camera lenses,
6. a special hydrofobic treatment causes that the water drops are not spilling over but they are forming balls = the drop slips from surface by itself or it can be blowed out using the blowing balloon,
7. excellent price-quality ratio = a satisfied customer who will turn back,
8. precisely manufactured = reliability,
9. possibility to exchange the glass in casew of its damage,
10. 10 years guarantee - the final quality check of each piece takes place in the Czech Republic,
11. when buying this, the customer gets a bonus: 1x replacement of broken or otherwise damaged glass completely free of charge,
12. custom - made filter.
VFFOTO´s recommendation:
UV filter VFFOTO TITANIUM GS is recommended for thoese, who are looking for luxory and precise quality without compromise.
This filter is suitable even for the best lenses with the focal length of 17-800 mm (recalculated on full frame) from companies such as Canon, Nikon, Carl-Zeiss, Leica, Hasselblad, Olympus, Pentax, Fuji, Sony etc.
Evaluation of the picture in atelier - color shift (color temperature set to 3600 K for both images):
| Schott B270 | Schott N-BK7 | |
|---|---|---|
| refractive index (light of wavelength 580 nm) | 1.5230 | 1.5168 |
| reflectivity of the glass (light of wavelength 580 nm) | N/A | 8.1% |
| color of the glass (lambda 80/5) | 35/31 | 33/29 |
| hardness of the glass (Knoop100) | 542 | 610 |
| density of the glass (g/mm3) | 2.55 | 2.51 |
| transmission of the glass | see graph | see graph |
The lower value refractive index, the better glass for photographic purposes - there is less refraction (refractive index of the light in vacuum = 1).
The lower value the reflectivity of the glass is better.
The lower value color of the glass is better.
If is the hardness value of the glass higher, the glass is harder.
10 years guarantee
1x replacement of broken or otherwise damaged glass
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