Mark II grey filters for 100-mm & 150-mm filter holders
The Mark II ND filters / grey filters are classic photo filters. Just like those of polarising filters the effects of ND filters are practically inimitable. Like grey gradient filters, grey filters also comprise a distortion and reflection-free neutral grey hue. This is uniform only for grey filters, instead of being phased out to transparent at the bottom. Due to the shading, longer exposure times can be attained by day or with the open aperture with back light or sunlight, since they reduce the quantity of light that hits the image sensor.
Thus, based on the ND strength, they facilitate different effects such as photographs of water surfaces with a velvety soft effect or filtering people out in front of buildings by longtime exposure, which is optimal for architectural photography. Many situations present the opportunity for expedient use of a grey filter. For example flowing movements, which the human eye cannot perceive as such in a picture. You can reduce the shutter speed in order to obtain certain effects such as representation of flowing movements.
Patches of fog, rivers, waves, lakes, and streams of clouds – all of those are typical situations, in which you can work with ND filters. The flowing movements are captured by the slow shutter speed and light is “swallowed” accordingly by the grey filter in order to create a gentle, calm picture, in which movements are to be suspected nevertheless.
In addition, grey filters are frequently combined with grey gradient filters in order to obtain more exciting effects. Here also, the Mark II filter holder system with the associated ND and GND plug-in filters offers many advantages since up to three different filters can be combined without a problem and can be flexibly changed and adapted to lighting conditions in seconds.
Also for grey filters it is suggested that you have different strengths in your personal photo equipment in order to be able to react flexibly. Here we recommend the Mark II 100-mm ND Filter Set for long time exposure, which comprises the Mark II 100-mm ND8 Filter, the Mark II 100-mm ND64 Filter and the Mark II 100-mm ND1000 Filter.
Mark II rectangular filters for filter holder systems in the profile
With immediate effect, Rollei is reverting to Gorilla Glass®* for its particularly high-quality rectangular filters. The filter glass of the current production series is thus not only extremely weather-proof but also doesn’t lose its optical characteristics due to careless or markedly rough treatment. In the process the special treatment of the Gorilla®* glass affects the molecular level directly. By means of a bath in a simmering, hot alkaline solution a precisely planned exchange of ions is started, which not only protects the raw material better against mechanical pressure but also clearly works against ruptures and scratches by means of an increased surface tension. Even in the event of profound damage the coating prevents further splintering of the material on the edges.
Gorilla®* glass is already innately, particularly translucent and distortion-free. The specific kind of glass guarantees that these outstanding optical characteristics are not impaired by contamination or damage. In addition, the filter glass benefits from the special coating developed by Rollei, whose quality is monitored regularly and stringently.
It is not only demanding photographers, who are among the beneficiaries of the unusual characteristics of the Gorilla®* glass. Display screens on premium smartphones and tablets are also manufactured from this particularly resistant material. The American company Corning Inc., can look back on more than 160 years of experience in the production and coating of special kinds of glass and lenses. Therefore Rollei rectangular filters can be manufactured from just 2-mm thick Gorilla®* glass and effortlessly meet all quality requirements that we apply to Rollei professional filters with a particularly low weight.
Resistant filters for use in nature and landscape photography
Rollei rectangular filters are made of 2-mm thick Gorilla glass®* but exhibit the best optical characteristics, when they are confronted with contamination due to water, fat, oil or dust. The special glass from the USA cannot be put off its stride even by the strongest energy source on our earth. The sun can strongly affect the rectangular filters, without causing damage, material changes or softening in the process.
Optical distortions are a thing of the past
The outstanding characteristics of the glass material with regard to freedom from distortion and light transmission are not impaired by the finish but are protected to a great extent. The resistance of the Gorilla®* glass is increased even more in interaction with the coating process developed by Rollei. The optical characteristic values of the Rollei rectangular filters are stipulated exactly and complied with precisely.
Luminance Coating for colours that are faithfully rendered in every detail
Reflections can lend an entirely individual look to photos or can completely ruin them. In order to use these optical effects purposefully, you must make sure to prevent their random occurrence. For this Rollei is now relying on a special treatment that it developed itself for our particularly high-quality filter glass. In the process the extreme light transmission and colorfastness are not impaired.
The specialised process is based on completely precise Rollei specifications, adherence to which is constantly examined, and, which can also lead to the refusal of complete deliveries. Due to the additional coating, the already extremely high-quality Gorilla®* glass from the special manufacturer, Corning Inc., which is resident in the US Federal State of New York, is able to combine three special characteristic fields in itself which are actually in opposition to each other:
- Extreme resistance to weather conditions, contamination due to dust, sand, liquids, fats or oils as well as damage, scratches, pressure effects and ruptures.
- Protection against light reflections and optical distortions.
- Outstanding optical values within the ranges of light transmission and colour neutrality.
You can fully rely on the impressive weather resistance and robustness of the additionally coated Rollei rectangular filters made from Gorilla glass®* even in extreme situations. Even bad knocks or unintentional contact with sharp, pointed objects make amazingly little difference to coated and colour neutral filter glass.
The optical tolerance values do not leave any leeway for quality defects: The colour curves of the glass must behave absolutely uniformly within the range of 400 to 800 nm. Otherwise they cannot bear the Rollei name. You can add reflections, colour deviations or special effects afterwards. The image material represents a neutral, reflection- and distortion-free basis for your creative ideas.
Photographic filters of the highest quality
The appropriate procedure is carried out in accordance with Rollei’s specifications and with narrow tolerance values and then carefully tested for quality. In order to achieve the best possible combination of optical quality and mechanical ruggedness this coating is still used in addition to the already extremely high-quality Gorilla®* glass. Rollei rectangular filters of the newest generation and the highest quality are the result.
Therefore, in the future, you don’t have to deviate into ranges with a lower risk of reflection, which may not set the scene for your subject that perfectly, but can completely rely on the high-quality, scratch-resistant, coated Rollei filters. Colour fidelity in particular is a genuine quality criterion in top-of-the-range filters since it is only with an absolutely colour neutral coating that the optical characteristics of the original subject are also captured on the memory card.
Stringent approximate values for unique filter photography
Our optical approximate values are strict: The visible range, within which the course of the curve of the colours must behave uniformly, ranges from 400 to 800 nm. If these results are not achieved, the filter blanks are not approved for further processing. Only the best types of glass become Rollei rectangular filters.
It isn’t only photography purists who prefer this approach. Fans of subsequent digital image processing begin gladly with the highest possible proximity to the lighting ambience found.
High-quality photo filters - Engineered and Quality Controlled in Germany
Quality is not a unique event, but a continuous process, which must be improved again and again and be adapted to the desires of customers and the possibilities of the technology. Therefore, after careful and intensive preliminary work, we introduced an unusually strict quality management process at Rollei, which guarantees the high quality of our professional filters over time. This quality management strategy documented as “engineered and quality controlled in Germany” involves different procedures and basic conditions, which far exceed customary specifications in the sector. In the process we proceed in an extremely structured manner and leave no result to chance:
The defaults and quality expectations of Rollei are all based on the following production steps.
The particularly high-quality Rollei Mark II rectangular filters for professional photographers and discerning amateurs include optical characteristics, which could not be guaranteed at the same time if there were lower quality guidelines. Therefore all criteria must always be fulfilled at any time. Compromises in one discipline would also immediately have an adverse effect on other aspects. Consequentially, the approval of new production samples is exclusively in the hands of the Rollei filter specialists.
However, series production does not mean a loosening of expectations for Rollei under any circumstances. Relentless quality control according to the AQL (acceptance quality limit) principle is performed before delivery of the production batches: If a precisely calculated quantity of products examined by random sampling falls through the cracks, the whole batch does not receive approval.
The delivered filters must then pass yet another final examination at Rollei once again in accordance with the strict AQL specifications before the products may be finally delivered to retailers and end customers.
In view of the already extremely high-quality raw materials and under consideration of the comparatively large quantity of substandard items the quality principle, “engineered and quality controlled in Germany” may seem somewhat too strict to many customers but you can always rely on the quality of your Rollei professional filters even in particularly challenging shooting situations.