Baader U-Venus-Filter (350nm)

Baader U-Venus-Filter (350nm)

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€ 210.00 Price excl. German VAT tax (19%): € 176.47

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  • Baader U-Filter (Venus and UV) 350nm.
  • Transmission peak approx. 80% at 350nm, bandwidth 60nm (320-380nm), completely blocking the entire spectral range from 200nm to 1120nm.
  • Dielectric multi-coating on optically polished Schott Glass.
  • Enables imaging in the deep UV spectral region. A "breakthrough" for imaging the planet Venus! Allows amateur astronomers to capture cloud structures of the Venusian atmosphere.
  • Successful astro-application of this filter requires a suitable UV-sensitive lucky imaging camera module (i.e. SKYRIS 274M) with at least a telescope of 5" diameter (a telescope with an 8" diameter is recommended).
  • Non-astronomical applications possible: e.g. check for paint damage on cars or state of health of plants and much more. Read more in the detailed description or with a translate tool on this (german) test review: Baader-U" in the "terrestric" Photography

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€ 210.00 Price excl. German VAT tax (19%): € 176.47

Product Questions

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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)
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)
What adapter would be needed to have the 2" UV filter work on a 72mm SIGMA 18-300mm lens?
Question by: James Pease on Jan 6, 2020 8:42:00 PM | 1 Answer(s)
How it is possible/which filter holder should I buy to mount 2" Baader filters (U Venuse filter, UV/IR cut filter) onto DLSR camera lenses with the diameter of 49 mm and 52 mm (Canon), please?
Question by: Petra Lesniaková on May 6, 2020 9:45:00 PM | 1 Answer(s)
Hello, what's the actual size of your 1(1/4)" filters in "mm"?
I have a Samsung lens 20-50mm, that is a 40,5mm. Can I use this filter size our I need a adapter? If I need a adapter... What adapter is suggested for this lens? Thank you.
Question by: Guido Grimaldi on May 13, 2020 6:19:00 PM | 1 Answer(s)
I am looking for Baader Planetarium Ultraviolet Venus filter. I s this the same as U-Venes Filter? I will be using it for UV reflective photography. I'm using a Nikon D70 camera with a 55 mm Nikor lens to be attached to the nikon base. Which attachment do I have to buy? I have step up and step down converters. Would those work? I use 52mm filters (IR pass as well as UV-IR block) with the same lens.
Please let me know ASAP. Also how much would delivery cost and the amount of time taken to send to Melbourne Australia?

Thank you
Question by: Sadra Zekrgoo on May 12, 2017 5:47:28 AM | 1 Answer(s)
Is it possible/adviceable to stack two of those filters to achieve even more suppression of VIS/IR-leakage? I.e. for applications different than astronomy? Will there be multiple reflexions or similar effects?
Question by: Toni on Jan 31, 2018 8:19:00 AM | 1 Answer(s)
Could I have a 1" UV-Venus (350nm) filter custom made?
Question by: Carolien Coon on Jul 3, 2017 5:01:00 PM | 1 Answer(s)
Is it possible to have this filter in a custom size such as 8x5 cm?
Question by: Federico on Mar 17, 2021 5:27:00 PM | 1 Answer(s)
Would it be possible to custom order this filter in 77mm threaded for DSLR lens filter?
Question by: Ian McDermott on Feb 26, 2018 12:00:00 AM | 1 Answer(s)
1. Can I mount Baader U-Venus Filter on Canon EF 50mm f/1.8 STM Lens which has a 49mm thread? If I can, which attachments should I buy?

2. Can I take UV portraits of peoples faces with a Canon T1i (converted to full spectrum) + Canon EF 50mm f/1.8 STM Lens + Baader U-Venus filter?
Question by: Daumantas Katilius on May 2, 2018 11:37:00 AM | 1 Answer(s)


Baader U-Filter (Venus and UV) 1¼“" and 2"

Baader U-Filter with a Transmission peak approx 80% at CWL 350nm , bandwidth 60nm (320-380nm), with complete blocking of the spectral range from 200nm to 1120nm. Dielectric multi-coated coating on optically polished Schott glass UG-11. Enables shooting in the deep UV spectral region; a wavelength range that was previous inaccessible for amateur astronomers. The Solar Calcium K-Line also is within the passband of this filter.

Important Note:

The Baader U-Filter was created for imaging Venus with a webcam, CCD and CMOS cameras. Using the filter for visual observations is impossible due to the eye's insensitivity to this spectral range (UV).


Requirements for Successful use of this Filter

  • UV sensitive imaging camera such as the SKYRIS 274M with at least a telescope of 5" diameter. A telescope with 8" diameter is recommended.
  • Single Shot CCD are not suitable for use with the U-Filter.


Another field of application is the recording of the flare structures of the solar atmosphere - not just the edge of the Sun, but also in the solar centre. The Calcium-K line, where the torch areas are clearly visible, lying in the passband of the filter. & Copy; Dominique Dierick
Venus Recording © W. Paech
Venus Recording © W. Paech
Venus Sickle – 2/3 closed, a rare photo © M. Rietze

Philosophy, Application and Technique

The planet Venus is surrounded by a closed cloud cover, which moves at high speed around the planet. Here, different cloud bands, which show a steady change of details form similar to the cloud cover of Jupiter. Unfortunately, these clouds can not be seen in visible light, unlike Jupiter, meaning Venus appears completely structureless. However, by using a camera that is sensitive to inaccessible wavelengths unlike the eye, this cloud structure detail can be seen, in particular using ideal wavelengths in UV range between 320nm and 390nm.

Since the early days of amateur astronomy, amateurs have been trying to work in this light. The difficulty is procuring a suitable filter to work precisely in this short wavelength region adequately. A sharp short-pass filter with high transmission is virtually impossible to produce. This also applies, surprisingly, to interference filters. While a theoretically ideal UV bandpass can be produced, there is inevitably at least one second passage window in the visible range. This is fatal because this undesirable area cannot be blocked with coloured glass. In such a case you would need again an ideal short-pass filter, which again is not produced in sufficient quality.

Amateurs have tried with modest success to create a filter for stacking one UV passage without a second passage area. This meant a strongly reduced contrast and modest transmission, which is not ideal. Those who believe you can make do with a less transmission filter are soon disabused. In addition the glass of many telescope optics in the UV have a much lower transmission, which does not help.

The good idea of using an excellent UV-interference filter with a second window in the visible light, and evaluate only the blue channel in the resulting images of the colour camera used of course does not either. The filter on the semiconductor is subject to the same problems mentioned above. Also the blue channel gets light from the other channels added to it. Since the semiconductor is not very UV sensitive, the low leakage of the visual light tends to be shifted to the UV. This double image show significantly the effect of refraction and can make the UV detail inaccessible due to this inefficient rejection of light outside of the 320-390nm spectral range.

With the latest dielectric coating technology, it is possible to achieve an ideal UV characteristic with the highest transmission while blocking other transmission windows. This has made it possible for the first time for an amateur astronomer to photographically observe the changing clouds of Venus and to say goodbye to the vacuous white crescent. All Baader filters are finely polished optically (increases image quality). High magnification during eyepiece projection is also possible, without reducing the sharpness of the optics.


Non-Astronomical Application Areas

These filters can be used in the observation, by technical photography, of nature. For instance they are used to determine the health of plants. Automotive experts can examine if a vehicle has been repaired as the repaired surfaces are very clearly seen due to differing reflectance. Many other applications are still in testing.

Left Picture: Dr. K. Schmitt is using our UV filters to assess the damage by disease. In this example to make the damage to Primroses clearly visible a normal daylight and a UV image are taken. Using a subtraction algorithm the difference in the image shows the damage much more clearly than in the visual image. The pictures were taken with a Nikon D70, Nikkor 105mm UV.

Right Picture: I am truly pleased with the new 2" Baader U filter. I thank you and your team for making it! A TRUE MASTERPIECE ! You can see an Ultraviolet capture using this filter on a Nikon D70 camera. The car is uniformly a metallic grey under normal, visible light. The non-factory paint job shows up only under UV. This is my year round test object. With best regards, Sincerely, Vivek Iyer.

The Baader U Filter is only produced in set sizes relevant for use with astronomical telescopes. However, we do produce a family of adaptor rings to mount any of our 2 inch (50.8mm) filters in front of any camera lens which has a filter thread. It is important to note that not all cameras and lenses are suited to UV photography and this could result in a low signal to noise ratio in the image produced. For best results it is advised to use a specialized camera body responsive to UV light (that does not have typical blocking filters that everyday cameras have) and a suitable UV-transmitting photographic lens which has adequate glass substrates for the transmission of UV light.


DSLR Adaptation

2 Inch Baader Filter Adaptation for DSLR Camera Lenses
2 Inch Baader Filter Adaptation for DSLR Camera Lenses

Our Baader DSLR 2" filter holder (#2408166) can be fitted to most DSLR camera lenses either directly or by using lens adapter rings.

Example: For adapting the Baader 2" U-Filter onto a camera lens with 77mm front filter thread you will need:

  1. Baader DSLR 2" Filter-Holder M48/SP54 (item #2408166)
  2. Baader Lens-Adapter-Ring SP 54/ M62 (#2958062)
  3. Baader Step-up Ring M62/M77(#2968077)

See related product for more information and guidance on fitting our Baader U-Filter onto a camera lens.

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7 Item(s)

Lotta E. Locklund 212/08/2021 01/08/202112:34
  • Rating:
Capturing the UV spectrum
I tried the Baader U-Filter with the purpose of capturing the UV spectrum and the aspects of it that our eyes can not retrieve. It was an investigation done incorporated with a project about UV light and its harmful, but necessary properties for life.

I used the filter on a Canon 700D camera body which I had converted to full-spectrum with an Astronomik MC clear glass. Being completely new to using bandpass filter and to any type of infrared and UV-photography I am very satisfied with the very impactful results, however it does take a bit of experimenting to get used to the limited amount of light that enters the lens even on the brightest of days.

I am also happy with the great support I have received from Baader Planetarium concerning questions surrounding this, to me, new field of photography.

Lotta E Locklund
Master of Architecture and Extreme Environments
Royal Danish Academy
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Dhr van den Herik 132/05/2020 12/05/202013:01
  • more than 3 month(s)
  • Rating:
UV pass filter with outstanding performance
U Venus filter from Baader is the best price quality filter currently on the market. purchased 5 filters so far and we are extreem satisfied with the performance and the delivery.
Highly reccomended.
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DDW 219/08/2020 07/08/202007:35
  • more than 3 month(s)
  • Rating:
Baader UV
good product, fast delivery. recommended.
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kds315 315/11/2018 12/11/201815:33
  • Rating:
Review of the Baader-U Venus Filter for reflected UV photography
Using this filter since many years now, as my work-horse filter for reflected UV photography. Has hardly ever let me down, delivers excellent images, sharp and rich in contrast. Only in very difficult lighting situations (direct sunlight, metallic reflections), there is some slightest NIR leakage visible, as the out-of-band blocking is only about OD3, which in most cases (> 95% of all my work) is fully sufficient.
  • results are sharp and rich in contrast, good IR blocking, just the right bandwith, high peak
  • just OD3 blocking, would wish for OD4
  • Watch my video
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T. Klemmer 282/10/2018 10/10/201811:50
  • Rating:
Aufnahmen mit dem Baader U (Venus) UV Bandpass Filter
Hier sehen Sie mein Fazit, den gesamten Testbericht habe ich Baader Planetarium als PDF zukommen lassen:

Der Baader U Filter ist perfekt um spannende Aufnahmen der dynamischen Venus zu machen. Durch die hohe Transmission können auch mit langsameren Systemen mit langen Brennweiten sehr gute Ergebnisse erzielt werden. Der relativ enge Bandpass ermöglicht es den höheren Stand der Venus auszunutzen. Eine Empfehlung für jeden ambitionierten Planetenfotografen!
Den gesamten Testbericht finden Sie hier bzw. unter dem Tab "Downloads":

Venusaufnahmen mit dem Baader U-Filter
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FernandoSC 11/01/2016 12/01/201602:58
  • Rating:
A must have for Venus photography
This filter is great. When the atmosphere is calm, the filter delivers spectacular details of the venusian clouds.
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D. Dierick 204/07/2015 24/07/201507:16
  • Rating:
Great filter!
.. here are two images made of the sun today in very heavy turbulence with a Baader UV pass filter and my Tak TOA130F filter, with DMK camera. It knocked my socks off !

I tried immediately the Baader solar continuum filter to check the difference and I must say the UV pass gives a much higher contrast and depth. Great filter!
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