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Baader Semi Apo Filter
(Preview)
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Eyepiece
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1
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4166
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Baader Semi Apo Filter 31.7mm[url=http://astronomia.co.uk/index.php/baader-semi-apo-filter-31-7mm.htm...
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Contrast Booster Filter
(Preview)
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Eyepiece
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3
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4075
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Baader Contrast Booster Filter The Baader Contrast Booster Filter takes contrast enhancement and skyglow reduction to the optimum level possible. Not only does the Baader Contrast filter deliver a significant enhancement of planetary and lunar contrasts, but it is designed to completely elim...
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Baader Fringe Killer Filter
(Preview)
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Eyepiece
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1
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2925
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Baader Fringe Killer Filter 1.25" Achromatic refractors, particularly short-tube telescopes with fast focal ratios suffer from noticeable chromatic aberration or false colour (seen as a blue/cyan fringing on high contrast objects). The 1.25" Baader Planetarium Fringe Killer fi...
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Oxygen III (OIII) Filter
(Preview)
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Eyepiece
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2
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2676
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The 1-1/4" OIII narrowband filter isolates just the two doubly-ionised oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photo...
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Wratten #38A: Dark Blue Colour Filter
(Preview)
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Eyepiece
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2
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1518
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Wratten #38A: Dark Blue Colour Filter (17% transmission): A popular filter for the study of Jupiter's disc; owing to the filter's strong rejection of orange and red wavelengths. Increases contrast between the reddish belt structures and enhances detail of the Red Spot. Also useful for the study...
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Filter thread
(Preview)
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Eyepiece
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2
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2698
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Most eyepieces nowadays have threaded barrels to accept filters. Quality diagonals also may have threaded barrels, (which is convenient, as you do not have to swap filters when changing eyepieces). Quality filters should also be 'stackable' allowing two or more(?) filters to be used at the same t...
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Solar Filters
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1 2
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(Preview)
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Telescopes
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13
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12107
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Baader A4 AstroSolar Solar Filter Material ND 5.0 Baader Planetariums AstroSolar safety film is a specially manufactured streak- and blisterfree foil. It attains the optical performance of planeparallel glass filters. The base material is not "Mylar". High density coatings on bo...
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Wratten#80A Blue Filter
(Preview)
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Eyepiece
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2
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5144
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#80A Blue (30% transmission): (2-stops) The most popular filter for the study of Jupiter and Saturn. 3200 K to 5500 K. Enhances contrast of rills and festoons in Jupiter's cloud belts as well as details of the Red Spot. Brings out detail in Saturn's belts and polar phenomena. Very useful as a cont...
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Filters
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(Preview)
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Telescopes
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15
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10139
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Lunar and Planetary Filters To bring out contrast in the clouds of Jupiter and Saturn, or see fine detail on the surface of Mars, you should consider a set of inexpensive coloured-glass planetary filters that thread into your eyepieces. Here's a quick guide to choosing a few filters that will help y...
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Polarizing filter
(Preview)
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Eyepiece
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0
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1129
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A polarizer is an optical filter that passes light of a specific polarization and blocks waves of other polarizations. It can convert a beam of light of undefined or mixed polarization into a beam with well-defined polarization. The common types of polarizers are linear polarizers and circular po...
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Light-pollution filter
(Preview)
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Eyepiece
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2
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4253
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Sky Watcher 1.25" anti-light-pollution nebula filter (LPR) These contrast-enhancing anodised aluminium, optical glass filters are designed to block out the wavelengths of light emitted by mercury-vapour light and other common causes of light pollution, whilst providing higher trans...
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Ultra High Contrast Filter
(Preview)
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Eyepiece
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0
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1099
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The narrowband UHC filter, like the O-III filter, isolates the two doubly ionised oxygen lines (496 and 501nm) in addition to the hydrogen-beta line (486nm) emitted by planetary and most emission nebulae. This filter permits superb views of objects like the Orion, Lagoon, Swan and other extended...
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Minus Violet Filter
(Preview)
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Eyepiece
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0
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1377
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Minus Violet Filters are used primarily to eliminating blue halos around bright stars in colour photography using refracting telescopes. They will to a lesser extent reduce visual chromatic aberration in achromatic refractors, (though a yellow filter will probably be better). The filter t...
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UV-IR CUT filter
(Preview)
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Eyepiece
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8
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10351
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UV-IR CUT filter will block undesirable ultraviolet and infrared rays that may interfere with the image. The filter will remove the IR chromatic aberration in lens imaging systems, and give pinpoint star images with digital and CCD-equipment. This is especially important where the digital imag...
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Wratten #11 filter
(Preview)
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Eyepiece
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0
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1213
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A Wratten #11 yellow-green filter is similar to a vintage pale green-yellow filter made by Voigtlander, and used for colour correction in photography. For astronomy, the filter will enhance contrast on the moon, and reveal detail on Mars (darkens the maria), Jupiter (cloud structure/the Great R...
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Star Analyser Grating filter
(Preview)
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Eyepiece
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5
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4222
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Star Analyser is a blazed diffraction grating in a 1,25" filter thread. You can screw it to a eyepiece or to a webcam, small astronomy CCD camera. It will split star light into a spectrum from blue to red like a prism (or rainbow). Such spectrum can tell many things about a star or other target - like...
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Filters for Saturn
(Preview)
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Eyepiece
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0
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1157
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Filter tips for observing Saturn: A #82A Light Blue filter is a popular filter to highlight low contrast features on the planet. A #11 Yellow-Green filter (78% transmission) is also a nice general filter to observe Saturn. The filter will increase the contrast of any dark surface detail on the plane...
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2" filters
(Preview)
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All queries go here
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2
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1623
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Just read your excellent review on LPR filters, but why are the 2" filters so expensive?
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Filters for Mars
(Preview)
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Eyepiece
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1
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2898
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Although I'm a purest for a clean light transmission through a telescope i'm also a big fan of filters. Filters can have a large and real effect on your observations. Mars appears as a tiny red/orange disk even in large telescopes so filter colour, light transmission, telescope magnification, and...
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Green filter
(Preview)
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Eyepiece
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6
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3950
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A #58 Green filter (24% transmission) rejects red and blue wavelengths. The filter is usually used to increase contrast on Venus, or the Martian polar ice caps; but it does a reasonable job of increasing contrast on nebulae. The filter, centred around the 530 nanometres spectral region, includes...
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Calcium K filters
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1 2
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(Preview)
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Eyepiece
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10
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11435
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Backyard Calcium K filters range from a diagonal inserted into a telescope, rear mounted filter or a complete telescope system. All three designs do the same thing, block unwanted light and pass the Calcium K emission line. Read more...
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Solar Equipment
(Preview)
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Telescopes
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3
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2059
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Solar Equipment Click to Play | View Details
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Hydrogen Alpha Filter
(Preview)
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Eyepiece
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1
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2326
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The sun has two prominent element spectral lines: Hydrogen Alpha and the Calcium K-line (at 3933 Angstroms). A hydrogen-alpha filter, or H-Alpha filter, blocks all parts of the solar spectrum except the alpha spectral line of Hydrogen at 656.281nm (6562.8 Angstroms), and allows you to see fine de...
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Wratten #25 Filter
(Preview)
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Eyepiece
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2
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3941
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A Wratten #25 (or Cokin #003 Red) red filter will block all other wavelengths of light below 580 nm. The filter will enhance contrast on Mars, Jupiter, and Saturn and solar (with a solar filter) features. A red eyepiece filter, such as the Wratten #25, will darken a sunspot umbra, causing it to stand o...
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Wratten #21 Filter
(Preview)
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Eyepiece
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0
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2714
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Antares #21 Orange Filter 1.25" 46% transmission Reduces transmission of blue and green wavelengths. blocks visible wavelengths below 530nm. Useful on Mars for Maria and sharpen the bounderies between yellow/orange area...
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X-ray diffraction grating
(Preview)
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Telescopes
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0
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2396
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Title: First results from a next-generation off-plane X-ray diffraction grating Authors: Randall McEntaffer, Casey DeRoo, Ted Schultz, Brennan Gantner, James Tutt, Andrew Holland, Stephen O'Dell, Jessica Gaskin, Jeffrey Kolodziejczak, William W. Zhang, Kai-Wing Chan, Michael Biskach, R...
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