Astronomik L-3 UV-IR Block EOS Clip-Filter

Codice articolo: 8H00SL

• The Astronomik L-3 IR/UV Blocking Clip-Filter is directly inserted into the camera body and works as a luminance filter and dust protection.
  ♦ Blocks UV and IR

  ♦ Narrow spectral range, good for users of refractors with a less-than-perfect color correction

  ♦ Fine-optically polished substrate

  ♦ Clip-mounted for Canon EOS cameras with APS-C sensor

  ♦ Inserting and removing within seconds

  ♦ All camera and lens functions remain unaffected

  ♦ Completely resistant against high humidity, scratches and aging effects

  ♦ 10 years warranty by manufacturer

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.

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 Canon EOS cameras with APS-C sensor
Inserting and removing: within seconds
Camera and lens funtions: unaffected