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Posts Tagged 'filter filter'

Black Weekend Sale: prices slashed on over 200 products. This weekend only!

November 24 2023, Anita Maier

Are you looking for a good bargain for Christmas? Then take advantage of our Black Weekend sales. Among these special offers there is something for every astronomer and every budget. Prices apply from Friday 24th until Monday 27th November 2023.

 

Top Deals of Black Weekend!

 

Binoculars:

Omegon Binocular Hunter 10×42

Save 70 Euros now!

 

Omegon wide-field binoculars for star field observing 2.1×42

Save 40 Euros now!

 

 

Omegon Nightstar 20+40×100 Doublet binoculars with interchangeable eyepieces

Save 300 Euros now!

 

Telescopes:

 

Omegon Telescope N 150/750 EQ-3

Save 70 Euros now!

 

Meade Telescope AC 90/900 Polaris EQ

Save 200 Euros now!

 

Skywatcher

Skywatcher Telescope N 200/1000 Explorer 200P EQ5

Save 150 Euros now!

The sale is for a limited time only and while supplies last, for each article!

Seize the opportunity to save and order your Christmas presents this weekend!

Higher contrast for comet hunters: C2 Swan Band filter

September 29 2023, Stefan Taube

CS-Band-Filter

German manufacturer, Baader, has produced a new filter for 511 and 514 nanometre spectral lines which is available to fit both available filter thread sizes:

These Swan Band emission lines, which are named after their discoverer, are produced by carbon. They make up the majority of a comet’s gas tail in the visible spectrum. The filter only allows light from these two carbon wavelengths to pass through and blocks the ever-present light pollution. Structures within a comet’s gas tail, therefore, become more pronounced even in good observing conditions.

At the same time, it blocks the 501 nanometre OIII spectral lines. This increases contrast and makes it easier to distinguish comets with gas tails from comets with dust tails.

Both C2 Swan Band filters belong to Baader’s new CMOS-optimised filters:

New Baader UHC Filter

March 28 2023, Stefan Taube

10861_1

 

UHC filters are very useful aids in the fight against light pollution and natural sky brightness. They suppress artificial light but are transparent to wavelengths emitted by nebulous celestial objects. The effect of this for the observer and astrophotographer is considerably greater contrast.

The new Baader UHC-L filter is an all-purpose anti-light-pollution filter which also blocks LED lamp emissions in the blue part of the spectrum. Both passbands allow all of the light emitted by well-known nebulae through (the H-alpha and H-beta spectral lines of excited hydrogen as well as the OIII spectral lines of oxygen).

You can find all available filter sizes and formats here in our shop.

cmos-filter-groessen

The Baader UHC-L filter offers all of the advantages of the CMOS-optimised Baader filter:

  • Adapted for typical CMOS camera sensors
  • Reflex Blocker™ coating
  • Blackened edges
  • Every filter is individually polished and coated for optical precision
  • Life Coat™ coating for high durability

    Baader-Filter-Technologien

 

Video: Solar observation with telescopes and filter tips (with English subtitles)

October 19 2022, Marcus Schenk

Want to observe the Sun? Welcome to the solar observation club!

In this video we show you how to easily observe the Sun, sunspots or solar prominences using your telescope. Additionally, you will learn which filters and what additional equipment you need for this. Finally, fantastic images of the Sun await you. A guide for beginners and other fans of our central star. Solar observation is fun!

But beware… Never observe the Sun without a suitable solar filter! And never leave children unattended with a telescope or binoculars near the Sun!

Good to know: We will have a partial solar eclipse on 25 October. Secure your solar filter and solar eclipse glasses now – our stocks are limited.

From the video:

 

  1. Take care when observing the Sun
  2. What you must consider
  3. The technique of white light observation
  4. What is it and what can you see?
  5. Which filter works for me?
  6. What to consider for solar lens filters
  7. Glass or foil and finding the correct filter size
  8. How to locate the Sun quickly in your telescope
  9. Herschel wedges for refracting telescopes
  10. Observing solar prominences and chromospheres
  11. Impressions of the Sun in H-alpha


Products shown in the video:

 

Omegon 45791 solar filter

Omegon ProNewton N 153/750 OTA

iOptron GEM28 GoTo LiteRoc mount

Baader AstroSolar solar eclipse glasses

Astrozap solar filter for external diameters of 232 to 238mm

Baader AstroSolar® OD 5.0 A4 210x297mm solar filter film

Baader AstroSolar ASTF 200mm telescope solar filter

Omegon 150mm solar filter

APM Herschel wedge 2″ FastLock

MEADE 2″ Herschel wedge with ND3 filter and ceramic plate

Omegon Pro APO AP 72/400 ED Quintuplet OTA apochromatic refracting telescope

Coronado ST 40/400 OTA PST Personal Solar Telescope

Coronado ST 40/400 0.5Å OTA PST Personal Solar Telescope

Daystar QUARK H-alpha solar filter, Chromosphere

Daystar QUARK H-alpha solar filter, Prominence

Baader SunDancer II for observation and solar photography

October 7 2021, Stefan Taube

The Baader SunDancer II sun filter transforms smaller refractors quickly and simply into telescopes for solar observation using H-alpha spectral lines. In this wavelength, you can see the Sun’s chromosphere with dark filaments, bright radiation bursts and spectacular solar prominences!

Baader Sonnenfilter SunDancer II H-alpha 2"/1,25"

Baader SunDancer II H-alpha 2″/1.25″ solar filter

Simply position the SunDancer II between the diagonal mirror and the eyepiece and connect it to a power source. The filter is then automatically brought to the optimal operating temperature so that no adjustments are required during longer observations.

The SunDancer II can be safely used on refracting telescopes with apertures up to 80 millimetres. An additional energy rejection filter is only required in front of the telescope for objective apertures upwards of 80 millimetres; alternatively, the telescope can be dimmed using an optional 80mm screen in front of the lens.

Telescopes with secondary mirrors, such as Newtonian, Maksutov or SCTs, always require an additional energy rejection filter, regardless of their size.

The complete solar disc can be seen in telescopes with apertures of up to 600mm.

The T2 thread beneath the eyepiece clamp facilitates easy adaptation for larger cameras:

SunDancer II mit DSLR-Kamera

SunDancer II with DSLR camera

A power supply unit is included. For mobile observation, a  powerbank can also be used.

You can find further information on this particularly high-quality H-alpha filter for the eyepiece side here in our shop.

Astronomik MaxFR: Narrow band line filter for fast scopes

March 25 2021, Stefan Taube

The new filters in the MaxFR range are optimised for astrophotography using very fast telescopes, such as the Celestron RASA scopes or the Takahashi Epsilon astrographs.

Astronomik has made these filters available for the three most important spectral lines, namely OIII, H-alpha and SII, each available in half widths of 12 and 6 nanometres.

Astronomik Filter H-alpha 12nm

An H-alpha clip filter for Canon cameras from the MaxFR range

When you observe beneath brightened skies, astrophotography with line filters provides you with the best opportunties to capture successful images. Generally, an H-alpha filter is the first sensible purchase: Using this filter, you can effortlessly capture detailed images, even during the full Moon or beneath heavily brightened skies! It is also the correct filter for all nebulae which emit red light.

The OIII filter significantly increases your options as it enables all green/blue structures to be captured in detailed and high-contrast images. Planetary nebulae and star formation regions are especially rewarding targets!

The SII filter then completes your filter set, and enables you to create the same colour photographs as the Hubble Space Telescope using the three channels!

Which half width is right? In short, the use of 12 nanometre filters is ideal for DSLR cameras and all dark-current-limited cameras. Further suppressing the sky background using a narrower half width does not create more detail with these cameras. The 6 nanometre filters are the right choice for locations with more light pollution and for cameras with extremely low dark current, for example cameras with very good cooling. Especially in very starry regions of the Milky Way, the 6nm filter can also capture weak objects in high-contrast without them becoming lost in the mass of stars.

You can find an overview of all filters in the range here.

NBX – the new dual nebula filter from IDAS

October 19 2020, Jan Ströher

A new, high quality dual band filter has appeared on the market, in the form of the NBX nebula filter from Japanese company, IDAS.  It is especially efficient for nebula photography using fast optics, like the Celestron RASA, for example. Like the existing IDAS (Astro Hutech) nebula filters, the new NBX is of impeccable quality and workmanship.

The IGAD (Ion-Gun Assist Deposition) coating technology which has been specially applied to astronomical filters by the Japanese manufacturer, Astro Hutech, was originally developed for optical communication, where long-term stability (> 25 years) is required in rough field conditions.

IDAS NBX 48mm nebula filter

This leads to filters with robust coatings and durable spectral stability – even at extreme temperatures and humidity levels. This stability is especially important for bandpass curves with steep sides, such as H-alpha, LPS filters and other narrow band filters. Filters with IGAD coatings almost completely eliminate bandpass shifts of +/- 3 or 4nm, which are typical with standard filters.

The NBX is a dual filter which specifically focuses on OIII and H-alpha lines. The NBX‘s transmission curves in the H-alpha and OIII ranges are very clearly illustrated in these two figures:

Transmission curves in H-alpha

 

Transmission curves in OIII

 

You can see that the IDAS NBX filter primarily realises its full potential when used with very fast optical systems and astrographs, such as a Celestron RASA, especially fast Newtonian reflectors with f-numbers between f/2 and f/4 and special devices, such as the Officina Stellare Veloce RH 200 Mark II-AT (Riccardi-Honders).

The NGC 281 “Pacman” Nebula in the constellation Cassiopeia

This dramatically increases the contrast within emission nebulae, which predominantly consist of oxygen (OIII) or hydrogen compounds (H-alpha). Additionally, longer exposure times are no longer required, predominantly due to the use of the above-mentioned, extremely fast optics, but also due to the NBX filter’s special contrast effects. The filter is ideal for use with ‘one shot’ colour cameras and monochromatic CMOS cameras. An IR blocking filter is then no longer required. Additionally, the NBX is parfocal with other IDAS LPS nebula filters.

Good conditions for observing Venus

January 20 2020, Jan Ströher

In the coming weeks Venus, our “sister planet”, will become a good object for observing. The planet is a bright, easily detectable object in the morning or evening sky, but it is usually located very close to the horizon with corresponding atmospheric disturbance and rather short observing times. This will improve from around the end of January, when Venus will become progressively brighter and visible for longer in the evening sky. Then the planet will be found easily with the naked eye immediately after sunset and can be observed for almost four hours.

Even good binoculars, such as the Omegon Nightstar are suitable for observing. In telescopes with an aperture from around 90mm, Venus can already be identified as a small disc. Just like the Moon, the planet exhibits different phases, although details of the surface remain hidden owing to its very dense atmosphere. The cloud structures can be distinguished very well with telescopes from 130mm aperture. The use of a suitable filter (violet, dark blue, blue) is recommended to improve the contrast.

Credit: EXAME/JAXA/Divulgao, Brazil

Venus is the second innermost planet in our solar system and is a similar size to Earth. Its atmosphere consists of carbon dioxide, nitrogen, sulphur dioxide and various noble gases. This composition, combined with its proximity to the Sun, makes our neighbouring planet a hostile and mysterious world. As it orbits the Sun, Venus rotates backwards, that is in exactly the opposite direction to our Earth. Therefore on Venus the Sun rises in the west and sets in the east. After the Moon, the planet is the brightest object, but, just like Mercury it is only visible in the morning or evening sky – hence it is also given the designation “morning-” or “evening star”.

From mid-January, Venus dominates our evening sky immediately after sunset on the southwestern horizon. Between then and the end of March it changes its position from about 25° to 46° and reaches a brightness of -4.7mag by the end of April. During this period it moves towards the western horizon and passes through the constellations Aquarius, Pisces and Aries. In April it reaches Taurus and can even be found close to the Pleiades (M45) at the beginning of April.

From January to May it’s best to track Venus using a star chart.

Credit: Planetarium Bochum

Have fun observing Venus in 2020!

New: NB1 nebula filter from IDAS

March 25 2019, Stefan Taube

Luminescent emission nebulae, supernova remnants and planetary nebulae are all particularly beautiful objects pertaining to the night sky. This applies both to the simple process of visual observation, as well as to astrophotography. Nature illuminates such nebulae in specific spectral colours: the red light of hydrogen, the blue-green light of oxygen ions and also in the colours of sulphur and nitrogen ions.  Nebula filters enable these colours to pass through whilst blocking the diffused light of the natural luminance of the sky and of light pollution. The result is a marked increase in contrast.

With the Nebula Booster NB1, the filter specialists IDAS are introducing a new, very high-performing filter of this type onto the market, and one that is not overly expensive! As the transmission curve shows, the filter has high transmission and is permeable for all relevant spectral lines, with a surprisingly narrow passband: A real nebula intensifier!

Transmission curve IDAS NB1

 

The filter is ideal for photographing large nebula regions since it enables the typical colours of these objects to pass and blocks the disruptive skyglow. The filter quickly and completely cuts off near infrared up to 1100 nanometres. This is important since cameras are sensitive to this range, but telescopic lenses are optimised for the visible spectral range and are faulty in the infrared range.

IDAS Nebula Booster NB1

IDAS Nebula Booster NB1

 

The Nebula Booster NB1 is available with two versions which cover both of the common filter thread sizes and can be screw-fitted to the housings of eyepieces or cameras.

5 Simple Ways to See and Photograph the Lunar Eclipse and the Opposition of Mars

July 13 2018, Marcus Schenk

Attention all lovers of nature, amateur astronomers and night owls: the night of the 27th of July, 2018 will be totally different.  In this particular night, we will experience the Opposition of Mars and a rare Total Lunar Eclipse in Europe!  It is sure to be a midnight Summer dream, in the middle of warm temperatures and mystical experiences.

In this article, you will learn about, that which you can use to observe and photograph the Total Lunar Eclipse and Mars.

Another interesting point: currently, there are a number of other planets to see. Now is the perfect opportunity to jump into Astronomy.  You will be rewarded with a fireworks show of planets.  Mars, Jupiter, Venus and Saturn are waiting for you to rediscover them!

As the night slowly falls, the Moon will rise in the southeast.  Our satellite will look unusual and simultaneously fascinating.  Almost completely eclipsed, it will rise higher and higher.  The “blood Moon”,  which evoked fears and superstitions of death and destruction in earlier times, will be visible for us to witness with our knowledge and science in a relaxing manner and with a smile.

The highlight of this year: at a length of 1 hour and 44 minutes of totality, we will get to enjoy the longest Lunar Eclipse of the century! More information about this event is available below.

Now you can read on to learn about the 5 ways and effective products, to observe the Moon and the Planets. Let’s go!

 

1. Discover the Sky with Binoculars

The lunar eclipse is visible with the naked eye,  but with a pair of binoculars, the Moon in the Earth’s shadow becomes an especially intense experience. For an great observation, we recommend the Omegon Binoculars Nightstar 20×80.  These binos are a great alternative to a telescope or as an entry into Astronomy.  They are bright and something that you can always carry with you.  Just point the binos to the sky or mount them on a tripod.  Then you will see the Moon in all its glory and innumerable craters.  It is amazing with both eyes, as if you were there.  But there is more.  You can can even view  Jupiter and its moons as well as starclusters, such as the Pleiades or the Andromeda Galaxy.

Großfernglas 20x80

The Omegon Binoculars 20×80

2. Getting closer with a telescope

Much like a mega zoom into the cosmos: A telescope allows you to see real detail. Observe the entire Moon, singular lunar craters, Jupiter, or Saturn with its massive system of rings. However you want.  The possibilities are endless!  With a greater magnification, only available with telescopes, you will be able to see Mars for the planet that it is and not just the red “star” in the night sky.  The Omegon AC 70/700 AZ-2 is the most budget-friendly entry point.  With a 70mm aperture, it collects 100 times more light than the naked eye.  The eyepieces enable a 35x and 70x magnification, or in combination with a barlow lense up to 140x.  More details and more resolution is available in the Omegon AC 90/1000 EQ-2.  The telescope is our tip for entry into lunar and planetary observing.  With a 90mm aperture, you will be able to see many details, such as the cloud bands on Jupiter or the polar caps on Mars.

Einsteigerteleskop

The Omegon AC 90/1000 EQ-2 – Recommendation for entry into Astronomy

3. The simplest way to your own astrophotos

A photo of the lunar eclipse?  It’s possible with the simplest tools.

With a telescope, the path to your own photos is just a small step.  The best camera for such a task is right in your pocket: your smartphone!  Pick up a Smartphone adapter, which will keep your phone perfectly positioned above the eyepiece.  We also offer the more budget-friendly Omegon Smartphone Adapter, which demands a bit of finesse or the Omegon Easypic Universal.  This smartphone adapter is a self-centering and easy-to-use device.  It only takes one minute and you will already have taken your own lunar photo.

Smartphoneadapter

Omegon Easypic Universal Smartphone adapter

4. The right eyepiece is decisive, when it comes to details

With eyepieces, you often must separate the wheat from the chaff.  An eyepiece is essentially an extended arm of the telescope’s optic and you should put a lot of stock into selection, just as you would with a telescope itself.  A good tip would be to replace old or standard eyepieces with high quality ones, which can provide you with a significantly better image.  Excellent crispness and great contrast can be found in the Omegon LE Planetry Eyepieces for all 1,25“.  The customer reviews range from “just fantastic” to “you cannot believe it”.

The Family of Omegon LE Planetary Eyepieces

5. Color filters for better contrast

Much like a chain, the planets of Venus, Jupiter, Saturn and Mars will appear to us in a line, and all after darkness has fallen, during the most comfortable time of year.  The constellation of planets is so rare, that now is the time to jump into astronomy.  Amateurs can easily pinpoint the planets and see details of each.  Polar caps and other structures on Mars, or the big red dot on Jupiter become more visible with the appropriate color filters.  Placed into the eyepiece, filters can lead to an epiphany for any motivated observer.  The Omegon Color filter set features the most important ones for all planets.  Other contrast filters or our Lunar Filter are also a helpful inclusion to your collection.

Farbfilter für die Planetenbeobachtung

Color filter set with 6 color filters

 

Other information about the Total Lunar Eclipse and the Mars Opposition is available here:

Infographic: Total Lunar Eclipse on the 27th of June 2018

Mars Opposition 2018: How to Observe Mars and its Details