ND (neutral density - neutral grey) filter helps to redukce the light of all of the wavelengths (colors). While using ND filter, the photographer can extend the exposure time and change the size of the shutter according to his priorities, which allows him to have the length of the exposure under control even under extreme circumstances (sea, mountains, snow). Anyway, cheap ND filters don´t reduce the intensity of the light of all of the wavelengths regularly, which can cause color defects on the final picture.
Among the ordinary ND filters which contain a single glass with a given factor of darkening, you can also use so called variable filters; the construction of the variable filters is constituted by two polarizing filters that are turned opposite each other. The intensity of the effect can be set up by mutual setting of the variable filters to the specified extent - this can be done thanks to the possibility to rotate the moving part of the filter. The intensity of the exploitable darkening of the filter is changing together with the lens focal point. As the focal point´s length of the lens increases, the intesity of the exploitable darkening is increasing as well (see the table below). This filter can be used for landscape photography, as well as for portrait photography. A lot of film makers can´t do without this filter.
Variable ND VFFOTO filters marked like as PREMIUM SERIES are developed, 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.
These filters are being produced using first-rate polarizing foil of the Japanese company Nitto and the first-rate optical glass Schott B270 (more information about this glass can be found here).
ND filters of this series are designated especially for digital cameras, but they can be also used for classical cine film reflex cameras.
| used glass | optical glass Schott B270 |
|---|---|
| polarizing foil is sealed up all over its surface | yes |
| polarizing foil is sealed up on the sides | yes |
| black frame of the glass | yes |
| color shift | relatively small, around 500 K (it can be changing together with the intesity of the darkening of the filter) |
| thickness of the all glasses (4) | 2.5 mm +/- 0.2 mm |
| height of the frame after screwing | 5.9 mm - slim |
| material of the frame | aluminium alloy |
| number of antireflective layers | 14 (7+7) |
| nanolayers | yes |
| weight of the filter | 33 g |
| use of ordinary lens cap | yes |
| rear thread | M 67 x 0.75 mm |
| frontal thread | yes |
| time extension of | 2-5 EV (is valid for focal length about 35 mm) |
| light transmission | 50-3.125% (is valid for focal length about 35 mm) |
| HD quality | yes |
What can the variable ND filter 2-32x VFFOTO do - interior:
| lens focus (recalculated on full frame) | darkening | light transmission (%) |
|---|---|---|
| 16 mm | 16x | 6.250 |
| 35 mm or more | 32x | 3.125 |
VFFOTO´s recommendation:
This filter can be recommended 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 pictures in atelier - shift of the colors (the temperature of the colors is set up in both pictures for 3600 K):
Evaluation of the pictures in exterior - shift of the colors (the temperature of the colors is set up in both pictures for 5000 K):
Evaluation of the pictures details in exterior (100% magnification without sharpening):
The video was shoot by Petr Klempa (http://petrklempa.cz) using VFFOTO variable ND filter 2-32x:
10 years guarantee
the repair of the broken filter is 50% off of the filters current price for the members of VFFOTO club
Hodnocení přebíráme z Heuréka.cz
zobrazit všechny recenze
