New design- Noise Cut Filter
LPS-P1
for CCD, small diameter（φ35.5、φ31.7）

The charecteristic light transmission rates.

With NRF-JPN、
【Noise Rejection Filter, JAPAN use】

due to global interest, the name has been changed to
LPS-P1
although, it is similar in many ways to conventional noise filters,
the differences between the LPS-P1and it's predecessors are detailed below.

Conventional noise reduction filters cut
　Mercury lamp emissions, (the peaks at) 365.0nm(g line)、404.7nm(h line)
　　　　　　　　　　　　　　　 546.1nm(e line)、577.0nm、579.1nm、623.4nm
　Sodium lamp emissions（peaks）589.0nm、589.6nm
　And completely the range of wavelengths from ultra-violet〜450nm or purple〜indigo and 540〜620nm or green〜red.
　
　As a result, previous types of noise filters became
　colourless or produced unnatural colours when used in astrophotography.。
　

The LPS-P1
　1. It intensively cuts noice at the source.
　2. It cuts as much as possible from the predominant penetration bands.
　3. That is to say, it has been designed along the new concept that for silver
salt and CCD colour photography, the colour balance and the abundancy of colour expression is important.
Noise in 3 colour CCD seperation and silver salt photography occurs at the following wavelengths
　1. Natural light（atmospheric luminescence）
　　　Oxygen atom　　　　557.7nm、630nm、636.4nm
　　　Oxygen numerator　　　　300〜400nm
　2. Artificial light（streetlighting etc.）
　　　Mercury peaks　　　　365.0nm(g line)、404.7nm(h line)
　　　　　　　　　　　546.1nm(e line)、577.0nm、579.1nm､623.4nm
　　　Sodium peaks　589.0nm、589.6nm
　　　Neon peaks　　　585.2nm、588.2nm、626.7nm、640.2nm

The LPS-P1, even with light pollution, preponderantly
removes the peaks of mercury and sodium lights.

LPS-P1spectral transmissions

This shows the peaks which LPS-P1removes.

LPS-P1　u.v. to i.r. spectral transmissions

Although the LPS-P1blocks infra-red to some extentthere are some leaks.
For silver salt this presents no particular problems. However in CCD photography, the LPS-P1should be used in combination with an infrared filter/
KouHei Sha has the LRGB type 2 and 3 infra-red filters out on the market
We also recommend SBIG's product, the RGB Filter.。

a comparison of the LPS-P1 and conventional noise filters.

The blue line shows LPS-P1、The brown line show2s conventional noise filters
LPS-P1がいかに多くの色情報をもっているかが分かります。

The following table shows the dependence on the angle opf incident light.

Over 25 to 30 degrees, the noise reduction is lost at all peaks.
We recommend that the lens is attached at less than 30 degrees (incidence 15 degrees).

In order to use LRGB and LCYM filters together, it is necessary to be able to attach the noise filters to the sides of the body.
Ko Ei Sha's sliding filter camera adapter can attach a filter to the body.

Orders and reservations can be made to：

KOHEISHA Co., Ltd.
　　　　　 　　　　　　e-mail　koueisha@sannet.ne.jp

　　　　　　　　　　　PLEASE.

Methods of payment

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