Square Filters Mark II (58)

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Mark II Photo Filters for Plug-in Filter Systems - Gorilla® Glass & Luminance Coating

The photo filters of the Mark II series from Rollei are suitable for 100-mm and 150-mm formats and are available as grey filters and grey gradient filters made from Gorilla® glass in the respective 100 mm x 105 mm and 150 mm x 170 mm formats. The durable, translucent and distortion-free filter glass is also coated several times by the so-called Luminance Coating, which is also dirt-repellent and scratch-resistant. In the process, our Mark II filters guarantee the highest degree of colour fidelity, which we regularly ensure by means of our strict quality assurance and the company’s own filter laboratory. The Mark II rectangular filters were already tested in the Chip magazine independent product test for filters and awarded the rating of VERY GOOD.  Also the smart functionality of our filter holder / plug-in filter systems are impressive due to their high level of compatibility.

Why purchase grey filters & grey gradient filters of the Mark II series?

For impressive pictures, most of the time you need more than just your know-how, experience, a good camera and a high-quality lens. Nowadays, analysis of the subject, the building, the person or the landscape, which is supposed to be recorded, is frequently lacking. The individual lighting conditions, contrasts and the horizon lines require your awareness of visual aesthetics and the specific moment. Naturally, functions such as HDRI and thus so-called bracket series/multiple exposure and digital image processing provide numerous options for creating a slick, virtually perfect picture from every image. But like life, whatever you try to record in your images, photography also consists of compromises and of setting individual priorities and focus areas, as well as one’s own taste concerning picture aesthetics and design. We, at Rollei, are fans of Slow Photography and think that it is a wonderful feeling to have an individually designed picture in the box after detailed adjustment of a snapshot instead of cobbling together several poor images to make a “digital patchwork work of art”. And it is precisely here that our Mark II photo filters are used.

Photo filters like our Mark II gradient filters and grey filters for insertion into the filter holder enable you to adapt to all circumstances and lighting conditions and give professional and amateur photographers the feeling for unique picture design again, which cannot be replaced by post-processing of RAW files.

In addition, our plug-in filters have further advantages:

  • They are suitable for several kinds of lenses, right through to ultra-wide angle lenses
  • They prevent vignetting
  • Plug-in filters offer more combination options than screw-on filters
  • Plug-in filters can be changed considerably faster than screw-on filters and that facilitates more dynamics and flexibility in adjusting to changing lighting conditions, e.g. when you are shooting the sunrise or sunset
  • Grey gradient filters for filter holders make a precise adjustment on the relevant horizon line possible, by pushing them up or down because in the case of many subjects the horizon line is not in a central position. However, circular filters always have the horizon line in the centre and it cannot be shifted.

Mark II 100-mm and 150-mm grey gradient filters

Grey gradient filters facilitate shots of subjects with high dynamic range, for example, and thus different degrees of brightness and numerous contrasts, without the sky looking unstructured, for example, or some areas being photographed too brightly and others too darkly. What is perceived on location by the miracle of the human eye as rich in contrast and diverse, often becomes an under- or overexposed pablum in the picture, especially in the case of subjects with very high dynamic range like a backlit landscape, an uneven horizon line, a skyline or a rugged mountain landscape or a sunrise or sunset by the sea. However, because the individual areas of a picture section, which can be divided roughly into the top, the middle and the bottom, receive different quantities of light from the sun, they are captured using a uniform exposure time. The grey gradient filter ensures that less light from brighter areas and more light from darker areas hits the image sensor during the exposure time to compensate for this disadvantage of the latter in handling differences in brightness and contrasts in comparison to the human eye. Therefore, there are also different grey gradient filters for different situations.

The grey gradient ensures that every area in the selected image section receives the ideal quantity of light. In addition dealing with grey gradient filters slows things down because above all, landscape photography should not be one thing – and that is hectic. You can also tell that from your pictures at the end. It is not about perfection. It’s a question of authentically recording what has been seen and experienced. Everyone can do multiple exposures and later have a good picture generated by the computer from several differently exposed images. But capturing an impressive picture by means of our own perception and an awareness of the subject, for us, that is photography. In addition certain exposure errors like overexposure cannot always be corrected by digital post-processing since some image data is lost. Because the contrast and/or the dynamic range of a shot was too high, e.g. because of components rising up in forested mountain ranges or on a skyline, then even post-processing can’t be of any more help. If parts of the picture are eroded, you can’t get the light back afterwards.  However, if picture depths are too dark, then however noise occurs when the pictures are brightened. However, the bracket series with HDRI reaches its limits, if there is a question of moving subjects, such as a fast swell. Thus, Mark II gradient filters are still essential for landscape photography in spite of DSLR, DSLM and HDRI. We recommend that beginners resort to one of our Mark II photo filter sets, e.g. the Mark II Advanced 100-mm Rectangular Filter Set, which comprises a Mark II Soft GND8 Filter, a Mark II Reverse GND8 Filter and a Mark II ND1000 grey filter, which is ideally suitable for sunrises and sunsets.

Mark II grey gradient filters:

  • are available for 100-mm and 150-mm filter holders
  • guarantee the highest degree of colour fidelity
  • are available as soft GND, medium GND, hard GND & reverse GND filters
  • are available with a gradual neutral grey gradient (GND) in different ND strengths (GND4, GND8, GND1 and GND32)
  • avoid overexposure of the sky with a correctly presented landscape at the same time

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

Gorilla®* Glass

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.

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