• Used for Light Pollution Reduction
• Improves Overall Image Contrast
• Broadband Fully Multi-Coated Optics
• Does Not Affect the Color Balance Image

Why you need Astronomic filters?

Often, when photographing the night sky with a long exposure the pictures happened to be overexposed or low-contrast. The reason is in camera that receives polluted light from artificial light sources of the cities. Astronomic filters effectively cut off this unnecessary light making image clear and of high-contrast.
Every astronomical filter has its own purpose of use and differs by specifications or light transmittance characteristics.

Light transmission specifications

Below is a light transmission chart of Kenko Astro LPR Type II filter. Colored vertical lines indicate the points of the spectrum coming from city lighting:
Red line - gas charging mercury lamp
Green line - gas charging sodium lamps

The chart shows that Kenko Astro LPR Type II filter cuts these spectrum of light coming directly from the street lamps.

Coating technology

Kenko Astro LPR Type II adopts precision coating based on Ion Assisted Deposition technology. In order to achieve the desirable coating specification each coating layer is sprayed on the surface of the filter with the help of ion particles creating coherent multilayer surface more durable, more harder comparing with the common coating.

Restrictions on the use of lenses

Unlike Type I model Kenko Astro LPR Type II is not changing the color balance, so it is primarily designed for photography.

However, when shooting with wide and standard angle lenses color shift can occur in peripheral areas of the image. For this reason the we recommend using Kenko Astro LPR Type II filter with 100mm telephoto lenses or more (converting to 35mm film).
Below is a sample shot with wide angle lens (24 mm for 35mm full size cameras).

However, if you leave only the central area of the frame, you can see how the filter effectively suppress light pollution.