UHC-L / Ultra-L-Booster-Filter

More Views

Images uploaded by Customers

Add Your Review with Images
UHC-L / Ultra-L-Booster-Filter

Please choose product variant below to see price and SKU number

€ 98.00 Price excl. German VAT tax (19%): € 82.35

Please choose product variant below to see stock status  

  • Visual and photographic UHC-L Nebula filter with highest transmission
  • Ultra High Contrast L Filter blocks city lights and increases contrast of nebula and comets (C2 lines)
  • Can be used as LED-opimized Luminance filter for RGB-Imaging wtih skyglow suppression
  • Blue transmission optimized to block blueish skyglow caused by LED car- and streetlights.
  • Creates a much brighter image than a conventional Nebula filter
  • Ideal for deep-sky observers. This UHC-L filter is the perfect visual complement to narrowband OIII filters.
  • Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
  • Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim

* Required Fields

€ 98.00 Price excl. German VAT tax (19%): € 82.35

Product Questions and Answers

Do you have a question about this product? Then we would like to ask you to first look through the existing questions and answers, most likely your question has already been answered and you will get the desired information much faster this way. Your question is not listed? Then please click on the button "Ask a question".

Sort by ASC
What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

Rating of Question

What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

Rating of Question

I’m interested whether this filter would be good for cmos imaging of galaxies from B5 skies. LED light pollution is becoming an increasing problem from nearby city. How would this compare with say Neodymium filter?
Question by: Tom Gray on Apr 18, 2023 10:39:00 AM | 2 Answer(s)

Rating of Question



Baader UHC-L DeepSky Filter

Planeoptically polished

Baader UHC-L DeepSky - Alle Filter
All Baader UHC-L DeepSky Filter
1¼", 31mm, 36mm, 2", 50.4 mm, 50x50 mm, 65x65mm

Baader UHC-L Nebula filter with highest transmission, realistic star colors, also usable as highly effective LED-optimized luminance filter for LRGB imaging.

The Baader UHC-L filter is the classic allround "light pollution rejection filter", but now also blocked against the main LED emissions in the blue part of the spectrum. The passband curve corresponds to a wide dual-band filter without distorting star colors. The two passbands transmitt all light emitted by the known gas nebulae (the H-alpha and H-beta lines of fluorescent hydrogen as well as the OIII line of oxygen), while both the atmospheric most disturbing stray light from LED lamps and intense bluish car headlights as well as further stray light from classical street lamps and the natural night sky glow (airglow/skyglow) of the atmosphere are blocked to a large extent. At the same time, the UHC-L filter is coated with latest technology (CMOS-optimized) and therefore blocks false light much more effective than all previous UHC filters.

Use of the UHC-L filter

The application of the UHC-L happens mainly in visual and photographic observation of emission nebulae (star forming regions, planetary nebulae, supernova remnants) under medium to highly polluted skies. Its use is also interesting for comet observation: It passes the OIII line at 501nm as well as the two C2 lines at 511nm and 514nm which are characteristic for the gas tail of many comets.

This UHC-L filter is the successor of the well-proven plane-optical polished Baader UHC-S filter. It consequently complements it with the advantages of CMOS optimization (no disturbing halos, blackened filter edges, Life-Coat™-coating) while providing an improved transmission spectrum adapted to also cover modern LED light pollution. It provides a brighter image than many classic LPR (Light Pollution Rejection) filters and is therefore not only suitable for large, fast instruments, but also for smaller telescopes collecting less light, where a large exit pupil cannot be achieved. This applies for long-focal length telescopes as well as for small aperture telescopes that only have an eyepiece socket for 1.25" eyepieces. Unlike the single line or dual.line narrowband filters, the image is also bright enough for high magnification, while not diminishing the number of stars. For deep-sky observers, therefore, this UHC-L filter is the perfect visual complement to narrowband OIII filters.

The UHC-L filter is also excellent for photographic use. It does not just block polluting terrestrial light sources, but at the same time it serves as a luminance filter (L-filter), since it blocks all UV and IR transmission like a UV/IR cut filter. An additional UV/IR-cut filter is therefore not necessary: Cameras without a built-in UV/IR-cut filter thus deliver significantly sharper images on refracting telescopes. Both classical photographers and users of EAA/LiveStacking do benefit from the increased sharpness of stars and better contrast of nebulae, as well as the improved transmittance in H-alpha.

Like all Baader CMOS-optimized filters, Baader UHC-L filters likewise are plano-optically polished, with ultra-hard, sputtered dielectric coatings. Even a one-hour bath in boiling water cannot harm these filters! They are scratch-resistant and can be cleaned as often as desired.

The Baader UHC-L / Ultra-L-Booster Filter offers all the advantages of the CMOS-opitmized Baader filters:

  • Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
  • Reflex-Blocker coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • Identical filter thickness to existing standards, with utmost care for parfocality
  • Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
  • Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
  • Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

Baader Blogpost:
New CMOS-optimized Baader Filters

Related Articles

Additional Information

Technical Data not yet specifiedPlease choose product variant from dropdown above to see technical data of your chosen product

You may also be interested in the following product(s)

Overall Average Rating:
3 reviews
5 star
4 star
3 star
2 star
1 star
  • Date - Newest First
  • Date - Newest First
  • Date - Latest First
  • Highest Rated
  • Lowest Rated
  • Most Helpful

3 Item(s)

Dr.Georg N. Nyman 87/03/2023 29/03/202313:34
  • Rating:
Ausgezeichnetes Kontrastfilter für OSC Kameras
Ich habe diesen Filter für meine QHY600C Kamera bezogen und an mehreren Ha/OIII Nebelfeldern ausprobiert. Da die QHY600 eine Vollformatkamera ist, ist diese Größe sinnvoll um mit meinem RASA11 starke Vignettierungen vermeiden zu können. Eine Vignettierung ist nach wie vor vorhanden, die ist aber mit gut gemachten Flats komplett zu eliminieren.
Die Himmelsbedingungen für die Aufnahmen waren nicht besonders gut - das Seeing war durschnittlich und es zogen immer wieder hohe leichte Schleierwolken durch, die den Kontrast von Ha leicht und den von OIII deutlich reduzierten. Dennoch ist das erhaltene Ergebnis mehr als zufriedenstellend - ich finde es wirklich sehr gut. Die starke Ha Region des angepeilten Ziels - NGC2264, wurde gut differenziert wiedergegeben und die OIII Bereiche sind farblich neutral gut unterschiedlich herausgekommen. Trotz der durch das suboptimale Wetter beschränkten Summenbelichtungszeit erhielt ich mit einem vertretbaren Aufwand im Postprocessing ein durchaus respektables Ergebnis.
Aufgefallen ist mir auch, dass auch dieser Filter - so wie alle 2- oder 3-Bandfilter der leistbaren Preisklasse, im "Leerlauf" einen Farbgradienten beim Vollformat und der großen Öffnung des RASA (2,2) aufweisen - auch dieser Gradient ist mit den entsprechenden Flats komplett eliminiert worden und nachher bei dem entwickelten Stacks nicht mehr erkennbar.
Alles in Allem finde ich, dass diese Neuentwicklung eine sehr sinnvolle und wichtige Ergänzung für die Erstellung von OSC Aufnahmen darstellt.
  • Das finale gestackte und entwickelte Bild hat eine feine Farb/Kontrastdifferenzierung
  • Ein leichter Farbgradient bei Vollformat und Öffnung 2,2 an den Rohdateien - Flats sind unbedingt notwendig
Show more comments (-5) Hide comments
A.BRINGMANN 183/07/2023 03/07/202309:33
  • Rating:
UHC-L / Ultra-L booster filter 2'' opens up new fields of activity
I have chosen The Angel Nebula (NGC 2171) as a test object for the new Baader UHC-L / Ultra-L booster filter filter. This faint reflection nebula has filled me with desire and respect for years, as all my previous attempts at this object have practically failed.

The normal wide open LRGB filters do not provide sufficient contrast at my location (Bortle 5).

Only this wonderful UHC-L filter changed the game from the ground up. Admittedly, the night was moonless, but the visibility was not as good as in the high mountains or Namibia.

Nevertheless, the result is amazing for me and awakens in me (an inveterate narrow-band photographer) an undreamt-of desire for new fields of activity, unbelievable!

How to colour this luminance can be seen here:
Many thanks for your kind review! Since unfortunately it is not possible to render links in a product review, we have linked it again here: www.astrobin.com/jbza9k
Show more comments (-5) Hide comments
Christoph Kaltseis 51/02/2023 21/02/202310:54
  • Rating:
Der UHC-L / Ultra-L-Booster Filter ist top
Alnitak, 15x60s; Bin 2, aufgenommen mit den PlaneWave Delta Rho 350, f/3

Der neue UHC-L / Ultra-L-Booster Filter ist top; Nach dem Stacking und Aufdrehen der Daten ist nichts zu bemängeln! Kein Halo, kein Reflex; er ist genauso gut wie die neuen CMOS-optimierten RGB Filter.
Show more comments (-5) Hide comments

3 Item(s)

What kind of abuse are you reporting?
    Please, wait...