Astroklar Rectangular Filters

There's a good reason why scientific sky telescopes are located on islands or in sparsely populated regions. The steadily increasing light emission from cities and conurbations, also known as light smog or light pollution, makes observing and photographing stars or other celestial objects incredibly difficult. However, the unpleasant haze also disrupts "normal" night shots and city panoramas. DSLR and DSLM photographers can use the Rollei Astroklar Night Light Filter to reduce the effects of light pollution. The artificial light sources that cause the most light pollution are sodium vapor lamps (light wavelength approx. 590 nm) and mercury vapor lamps (light wavelength 545 nm and 580 nm). Among others, our night light filters block these wavelengths, thus enabling shots of clear starry skies and night shots without a yellow cast - even in large cities and their surrounding areas.

Less Light Smog, More Detail and Clarity

A special coating largely removes the yellow and orange light waves from the light, which are primarily responsible for the disturbing light haze. Not only do images of the night sky and stars gain significantly in contrast and clarity, but the advantages of this high-quality special rectangular filter, available in 100 x 100 mm width, are also evident in nocturnal city photography. In architectural or long-exposure shots in urban environments, even delicate structures and contrasts in the subject are preserved and no longer "break out". Due to the extensive filtering of warmer light components, your images will generally turn out somewhat cooler, so always perform a manual white balance and choose a color temperature between +700 K and +1,500 K of the spectrum without filter insertion to ensure the color authenticity of your images.

Best Optical Glass, Double-Sided Nano Coating

So that you can use your Rollei Astroklar filter even for demanding projects and in adverse weather conditions, the high-quality optical glasses have been coated on both sides with a special nano-coating. This additional protective layer not only reliably prevents reflections caused by uncontrollable light sources, which are particularly disturbing in night shots, but also has strong water, oil, and dirt-repellent properties. Cleaning your Astroklar rectangular filter thus becomes child's play - if it's even necessary. The light transmission when using the Astroklar filter is reduced by 2/3 of a stop or f-stop. In general, we recommend, not only when combined with other filters such as neutral density filters, polarizing filters and graduated neutral density filters in the filter holder, the use of a tripod and/or a remote release.