Manufacturer: Astronomik Filter
Product number: 8H00XR

EUR 159,00


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Astronomik Luminance filters L-1, L-2 and L-3
*The luminance channel is probably the most important for a great final image!*] Now you can select a luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the luminance channel!

Astronomik now offers you a range of three different UV+IR blockers as Luminance Filters. The different spectral window of each new luminance filters is designed to tune your setup to get the sharpest image from any optical design and any camera.

You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels.

While the high transmission level is a great aspect of the new Astronomik luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers have perfect colour correction, so it can be the width of the spectral band pass of the luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (chromatic aberration), making stars appear soft or bloated. In such cases, image processing can become difficult, so having a slightly narrowed spectral window in your luminance filter can reduce or eliminate this damaging effect.

Choosing the right filter characteristics
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 completely free of any 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 and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.

The transmission curve characteristics and coatings of the new luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.

Like all Astronomik filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains.

Additional note for observers working under light polluted skies:

If your observing site suffers from light pollution you should try to use Astronomik´s CLS-CCD as a replacement for the Luminance filter. The transmission curve of the CLS-CCD will give you approximately the same amount of energy in all three colour channels while blocking nearly all unwanted arifical light pollution. Customers who replaced the Lx filter with the CLS-CCD are amazed by the increased quality of their data. This small change gives you the opportunity to take much deeper images from your current observing site.

The technical challenge:
Do you own a Sony alpha 7 digital camera for astro-imaging? Then you have surely encountered the following problems:
Large filters for large camera lens objectives are very expensive.
If you place a filter holder between your camera body and lens, you loose the ability to focus to infinity.
For very fast (low f/ number) telescopes like the Vixen R200SS or the Takahashi “Epsilon” astrograph, a filter drawer or a filter wheel cannot be used since the distance to the corrector lenses would be changed.
With long exposure times, your camera’s sensor chip is exposed to more dust.


With the Astronomik Clip-Filter System you can take care of all of these problems at once!

The patented Astronomik Clip-Filters are made of black anodized aluminum and laser-cut on state-of-the-art machines. They can be inserted within seconds directly into the camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain operational!

The Clip-Filter System also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clear filter does not have a filter effect and only acts as a dust shield.)

Compatibility:

The Clip-Filter are sucessfully tested with the bodies Sony Alpha 7, 7r and 7s. (Astronomik will test other/future models and add them here.)

The manufacturer has made a short video which shows installation and removal of the clip-filter for Sony Alpha:



The filters are not suitable for Sony alpha 3000 to 6500 or Sony alpha NEX cameras.
Type:Interference bandpass filter
Maximum transmission:more than 95%
Substrate:Precision polished optical glass
Antireflective coating:Completely resistant against high humidity, scratches and aging effects
Mounting:Clip-mounted for Sony Alpha cameras
Inserting and removing:within seconds
Camera and lens funtions:unaffected
1 filter in plastic box



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