Special filter for visual observing celestial bodies, stars and constellations.
Kenko Astro LPR Type II filter is designed for photographing of astronomical observation of celestial bodies, stars and constellations.
Kenko Astro LPR Type II cuts off light pollution from artificial lighting of city streets (mercury and sodium gas charging lamps), and transmits only the light spectrum of stellar objects.
The filter does not affect the color balance of the 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.
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.
Kenko Astro LPR Type II features 6 sizes: 1.25ʼʼ (american size) for eyepiece, 48mm, 52mm, 67mm, 72mm, 77mm to screw on the objective lens of telescopes, SLR cameras and spotting scopes.
|Name||Kenko Astro LPR Type II|
|Country of Origin||Japan|
|Coating||Multilayer, interference coating technology:IAD (Ion Assisted Deposition) spraying via ionized gas, which makes coating resistant to external physical influences and increases the strength of the glass.|
|Complectation||Filter, Light transmittance graph, manual, plastic round case.|
|Item||JAN code||Net weight, g||Gross weight, g||Rim thickness, mm|
|American ASTRO LPR Type 1||4961607331705||6||38||5.1|
|48S ASTRO LPR Type 1||4961607348703||12||44||5.1|
|52S ASTRO LPR Type 1||4961607352700||14||46||5.1|
|67S ASTRO LPR Type 1||4961607367704||24||74||5.5|
|72S ASTRO LPR Type 1||4961607072738||27||77||5.5|
|77S ASTRO LPR Type 1||4961607077733||30||80||5.5|
The Orion nebula
Messier Objects (or Seven Sisters) open cluster in the constellation Taurus
Veil nebula in Cygnus constellation (NGC 6992)
Milky Way and some deep space objects in Scorpius-Sagittarius constellation (M6-M7-M8-M20 and M21). Left cut is without Kenko Astro LPR Type II and right cut is with Kenko Astro LPR Type II.
Shutter speed for both cuts: 30c
ISO: 3200 for left cut and 6400 for right cut
Lens: Sigma 150mm f2.8 EX
Camera: Nikon D700
Support: Sightron nano.tracker and Slik tripod
Place: Iran, Zanjan Province
Post production: Adobe Photoshop CC
Kenko Astro filter type II by X-light photography (September 4, 2016)
The Kenko Astro LPR filter is one heck expensive filter. Priced at 32000 JPY or about USD 320 for the 77mm version, this is the most expensive filter I have bought till date. But what is so interesting and so good about this filter? Well, the name of the filter will sort of explain itself – Astro Light Pollution Resistant (LPR) filter… read further
General care and handling of the photographic filter
1. Use filter carefully and always keep it clean. When cleaning use cleaning tissue or cleaning cloth. But before that remove as much dust and dirt as possible from the lens with a blower or brush.
2. Avoid unnecessary cleaning of your filter.
3. Filter is made of glass. When it is broken glass fragments may injure.
4. Do not disassemble filter by yourself.
5. When the filter is not attached to the lens, store it away from sharp objects. They may damage the filter glass.
6. Keep filter away from children.
7. Keep filters in plastic hard-sided case or filter pouch.
8. Keep filters dry and away from direct sun light.
9. Avoid storage in high humidity environment. Moisture drops due to the high humidity or dew on the filter can burn the coating and create traces on the glass surface that can be hardly wiped off.
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