* Astronomy

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

Baader Semi Apo Filter 31.7mm[url=http://astronomia.co.uk/index.php/baader-semi-apo-filter-31-7mm.htm...

Blobrana · Blobrana

A star diagonal is designed to place the eyepiece at comfortable viewing position on an astronomical telescope. A star diagonal is either constructed from a prism or mirror, and reflects the path of the light at, usually, a 90-degree angle to the telescope's optical axis. Newtonian-type reflecti...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

Title: A complex multi-notch astronomical filter to suppress the bright infrared sky Authors: J. Bland-Hawthorn, S. C. Ellis, S. G. Leon-Saval, R. Haynes, M. M. Roth, H.-G. Löhmannsröben, A. J. Horton, J.-G. Cuby, T. A. Birks, J. S. Lawrence, P. Gillingham, S. D. Ryder, C. Trinh A long-standing an...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

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...

Blobrana · Blobrana

Baader Hyperion 8mm Eyepiece 1.25" Baader Planetarium Hyperion 68° Wide Angle Modular Eyepieces offer world-class performance and unique photo-visual features, at an unheard of price. Baader Planetarium has worked hard to give the Hyperions the world's finest optical coatings, superb...

Blobrana · Blobrana

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...

Topic		Started By	Replies	Last Post
	Hydrogen Alpha Filter Filter (Preview) 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...	Blobrana	1	Jun 2 12:50 2012 by Blobrana
	Star Analyser Grating filter Filter (Preview) 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...	Blobrana	5	Jun 1 05:34 2012 by Blobrana
	UV-IR CUT filter Filter Webcam (Preview) 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...	Blobrana	8	May 11 14:51 2012 by Blobrana
	Contrast Booster Filter Filter (Preview) 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...	Blobrana	3	May 5 18:23 2012 by Blobrana
	Baader Semi Apo Filter Filter (Preview) Baader Semi Apo Filter 31.7mm[url=http://astronomia.co.uk/index.php/baader-semi-apo-filter-31-7mm.htm...	Blobrana	1	Apr 22 21:33 2012 by Blobrana
	Star diagonal Diagonal (Preview) A star diagonal is designed to place the eyepiece at comfortable viewing position on an astronomical telescope. A star diagonal is either constructed from a prism or mirror, and reflects the path of the light at, usually, a 90-degree angle to the telescope's optical axis. Newtonian-type reflecti...	Blobrana	3	Apr 19 15:42 2012 by Blobrana
	Filters for Mars Filter Mars (Preview) 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...	Blobrana	1	Mar 18 05:47 2012 by Blobrana
	Filters for Saturn Filter Saturn (Preview) 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...	Blobrana	0	Jan 19 22:43 2012 by Blobrana
	Hydroxyl emission line filter (Preview) Title: A complex multi-notch astronomical filter to suppress the bright infrared sky Authors: J. Bland-Hawthorn, S. C. Ellis, S. G. Leon-Saval, R. Haynes, M. M. Roth, H.-G. Löhmannsröben, A. J. Horton, J.-G. Cuby, T. A. Birks, J. S. Lawrence, P. Gillingham, S. D. Ryder, C. Trinh A long-standing an...	Blobrana	0	Dec 9 12:15 2011 by Blobrana
	Baader Fringe Killer Filter Filter (Preview) 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...	Blobrana	1	Dec 8 15:46 2011 by Blobrana
	Oxygen III (OIII) Filter Filter (Preview) 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...	Blobrana	2	Dec 8 10:38 2011 by Blobrana
	Wratten #38A: Dark Blue Colour Filter Filter (Preview) 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...	Blobrana	2	Dec 7 22:07 2011 by Blobrana
	Wratten #11 filter Filter (Preview) 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...	Blobrana	0	Dec 3 09:31 2011 by Blobrana
	Baader Hyperion 8mm Eyepiece (Preview) Baader Hyperion 8mm Eyepiece 1.25" Baader Planetarium Hyperion 68° Wide Angle Modular Eyepieces offer world-class performance and unique photo-visual features, at an unheard of price. Baader Planetarium has worked hard to give the Hyperions the world's finest optical coatings, superb...	Blobrana	1	Nov 18 21:39 2011 by Blobrana
	Minus Violet Filter Filter (Preview) 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...	Blobrana	0	Nov 18 18:03 2011 by Blobrana
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