Manufacturer: Astronomik Filter
Product number: 8H00S9

EUR 119,00


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Astronomik Clip Filter for mirrorless APS-C Cameras of the Canon EOS M System
The ProPlanet IR 642 BP is the lastest addition to the family of Astronomik ProPlanet IR-pass filters.

The filter thrills because of its wide range of applications for daylight IR photography, high-resolution lunar and planetary imaging and for taking beautifull and deep images of H-alpha regions when used for astrophotography.

"BP" are short for "Bandpass": The filter gives you a 200 nm spectral window from 642 nm to 842 nm. Contrary to the other two ProPlanet filters it blocks the longer infrared. Together with the Astronomik ProPlanet 742 and the ProPlanet 807, you can now have three choices to match your needs when imaging in the IR. The Astronomik ProPlanet 642 BP will be the right choice for the best image quite often!

With the Astronomik ProPlanet 642 BP, you get three filters in one product: depending on the camera, it is a fine tool for daylight IR photography with a digital camer, reduces seeing and enhances contrasts in high-reslution planetary and lunar imaging and is a economically-priced H-alpha filter for the start into deep-sky astrophotography of H-alpha nebulae.

How it works:
The ProPlanet IR 642 reduces dusturbing atmospheric affects when creating monochrome planetary and lunar videos. This is achieved through a transmission window where the wavelangth range has to fullfill a couple of requirements:
the unsharpness which is caused by vertical motion of air in the atmosphere (seeing) are minimized
the camera sensitivity is used best
the wavelength range is tuned to the resolution and correction of the telescope.


The filter is designed for (astronomical webcams without built-in IR blocking filter or MC-modified DSLR cameras with video function. The wavelength range which passes the filter is a mixture of seep red and short wave infrared. Thus the filter is usable for colour imaging with the Astronomik L-RGB filter set for replacing the L filter under bad seeing, so that clearly sharper and less deformed images can be achieved. This enhances the usability of the images in postprocessing considerably. By including the H-alpha and [S II] lines, it is a wide-band, but economically priced alternative to pure line filters of those wavelengths.

The focal range for getting optimal results can be found between f/1 and f/30.

Description of the possibilities of the Astronomik ProPlanet 642 BP:
High-Resolution Lunar & Planetary imaging:

High-resolution imaging of the moon and the planets is a part of astrophotography which has evolved in the past 20 years at an incredible speed. You will need a low noise video-camera and dedicated image-processing like AstroStakkert, Registax or AviStack plus a infrared-pass filter to enter this field of astrophotography!

Why Infrared? Every observer knows the flickering stars and planetary disks when looking through an eyepiece or at your monitor. Slight differences in temperature and preasure result in a different index of refraction for "bubbles" of air. As these bubbles move, the image moves too! This effect is called "seeing".

This change in the index of refraction becomes smaller the further you go to the infrared (longer wavlengths), and due to that, the seeing becomes better too! When observing with the human eye we have no options: The human eye is not sensitive to infrared light. But with the sensor of our camera we can go to the infrared part of the spectrum and enjoy the steady air.

Deep-sky astrophotography:

At the well-known H-alpha emission line, the ProPlanet 642 BP reaches its maximal transmission of almost 100%. Whereas all photons of the beautiful H-alpha regions hit the sensor, shorter wavelengths with the bulk of the light pollution are blocked. If using an astronomically modified camera, the bandwidth is reduced to 40 nm. The result is an enormous gain in contrast due to a darker sky background.

Daylight IR imaging:

One initial point when develloping the ProPlanet 642 BP was daylight imaging with (modified) digital cameras.

For normal photography, an IR blocking filter is mounted directly in front of the sensor in the camera, as the sensors are sensitive up to more than 1100 nm. By removing this built-in filter, a camera can be used for the very interesting IR photography.

The Astronomik ProPlanet 642 BP starts transmittion in the deep-red spectral range and lets pass all light up to 842 nm. Thus you get images perfectly suitable for channel selection and allows for an outstanding color separation in postprocessing, as the starting wavelength of 642 nm, combined with blocking long-wavelength delivers especially constrasty images.

Notes:
The ProPlanet IR 642 BP is suitable exclusively for cameras without IR blocking filter. Especially with colour cameras without IR blocking filters it is the best to take monochrome images, as the Beyer matrix is not defined in IR and the camera gets ´color-blind´. The Astronomik Planet IR 642 Pro BP is not suitable for solar observation or photography, even if used with a solar filter.

Alternatives:
For luminance exposures (monochrome cameras) or colour imaging in the visual range, we recommend the Astronomik L filter. For pure IR exposures, we recommend the Astronomik ProPlanet 742 IR pass-filter or Astronomik ProPlanet 807 IR pass filter.

If the seeing is mediocre and if the telescope is smaller than 10" (250 mm), we recommend the use of the Astronomik ProPlanet IR 742.

If the seeing is very bad and the instrument is 10" (250 mm) or larger, the Astronomik ProPlanet IR 807 may be the better choice.

Compatibility:
The clip filters for EOS M can be used with the models M1, M10, M3, M5, M6, M6MkII and M50.

The transmission curve:

On the horizontal axis, the wavelength is plotted in nanometers. 400 nm corresponds to a deep blue, at 520 nm the human eye sees green, at 600 nm red.


At 656 nm is the known H-alpha emission line of hydrogen, around 500 nm the two [O III] lines of oxygen, at 486 nm the H-beta line of hydrogen, around 672 nm the two [S II] lines of sulfur. The square brackets indicate that these are forbidden lines.
On the vertical axis the transmission is plotted in %.
The dark red line shows the transmission of the filter.


A short guide for selecting the right filter
Lots of customers are overwhelmed by the vast number of filters offered by Astronomik. Due to that they give you a short guide how to select the right filter for your application below:

Astronomik´s normal recommendation for the "First Filter" is the CLS filter. The CLS blocks all unwanted artifical light pollution and natural airglow and gives you a dark background in your images. When using this filter you may expose much longer than without, so you will be able to pick much fainter structures and objects. The filter is designed in such a way that all objects are given in their natural colors - they would look the same if your human eye would be much more sensitive!

The CLS is the fist choice for any applications like night-scape photography and time lapse movies!

Important: The standard CLS has no built-in IR-blocker. In case your camera has been modified for astrophotography, please take the CLS-CCD which has a built-in IR-blocker!

If you have to work under a heavily light polluted sky, the UHC is a good choice too. Its transmission curve is very tight. It gives you the light from the Hß, [O III], Hα and [S II] lines in one single exposure. The reduction of light pollution is much stronger than the CLS/CLS-CCD, but the filter will work for gas nebulas only - any galaxies and open or globular clusters are filtered out! You will get "false colors" with the UHC, not natural colors like with the CLS/CLS-CCD.

The UHC-E has a more broadband light transmission. Here stars are less strongly suppressed, helpful for nebulae with star clusters.

If you want to die deeper into astrophotography, you should think about emission line filters centered on OIII, H-alpha and SII, available either with 12 nm or even 6 nm bandwidth. With these filters you can do ultra-deep images even under the worst sky you can imagine plus the full moon high up in the sky. The emission line filters isolate the light from a very tight range of wavelengths, don´t get any color information. If you want to create color images (false color like images from the HST), you will need all three filters to mix the three channels into a final color image.

When using DSLR cameras without IR cut filter in astronomy, we recommend the UV-IR block filters of the L-1, L-2 and L-3 series to correct chromatic aberrations when using refractive optics (camera lenses, refractors). Depending on the color correction of your scope you may use a wider spectral window for the luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.

If you use an optical system that is more or less free of chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction.

As protection against dust in DSLR cameras without IR cut filter, the MC clear glass filter is suitable. It blocks neither visible light nor UV or IR, but is parfocal with the other clip filters for Canon EOS R/RP full-frame cameras.

Especially made for planetary imaging are the ProPlanet IR pass filters. The IR light transmitted by them is less sensitive to air turbulence ("seeing"), which makes the images sharper, with increasingly longer wavelengths being increasingly less affected.
Transmission between 642 nm and 840 nm:more then 95%
Line Transmission:more than 90 % at H-Alpha, S[II] and N[II]
Blocking:wavelengths between 350 nm and 630 nm
Substrate:Precision polished optical glass
Substrate thickness:1 mm
Antireflective coating:completely resistant against high humidity, scratches and aging effects
Inserting and removing:within seconds
Camera and lens funtions:unaffected
1 Filter in plastic box



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