EXPLORE SCIENTIFIC 1.25" H-Alpha Nebula Filter 7nm

The EXPLORE SCIENTIFIC H-Alpha filter allows photography of red glowing emission nebulae; narrow band version with 7 nm to increase contrast even in difficult urban conditions.

High-quality EXPLORE SCIENTIFIC H-Alpha filter
Only lets the emission lines of hydrogen pass
Absorbs all other emission lines and almost all artificial light
Ideal for use near the city, with heavy lightened skies
Band pass width: 7 nm
Better contrast and more details achievable for urban astrophotographers
Blocks almost all light from mercury and sodium vapor lamps
Many of the red glowing emission nebulae are only visible in full expansion on photos taken with these filters
In spite of the existing light pollution amazingly good image results are possible
Individual test certificate included to guarantee you receive a premium filter

Currently not available

Product number: 0310145

EAN: 4007922072753

WEEE-Reg.-Nr.: DE 34323861

Product information "EXPLORE SCIENTIFIC 1.25" H-Alpha Nebula Filter 7nm"

Apart from air turbulence, the brightening of the night sky is the greatest barrier to observing faint objects beyond the solar system. Due to streetlamps and other artificial lighting the sky in urban areas is no longer properly black. As a result, the contrast and thus the perception of deep-sky objects also suffer. However, depending on the type of celestial object, it is possible to filter out some of the interfering light making it easier to photograph the objects.

The EXPLORE SCIENTIFIC H-Alpha filter uses the characteristic of the so-called emission nebulae. These objects glow in certain colors, the so-called emission lines. The emission lines are associated with certain chemical elements - in this case the red glowing hydrogen. This filter blocks all other colors (and therefore almost all artificial light) and lets only the emission lines of hydrogen through. Especially the disturbing light of mercury and sodium vapor lamps is effectively blocked. The effect is amazing: Suddenly, nebulae become visible on the photos in places which appear completely empty without the filter.

The EXPLORE SCIENTIFIC H-Alpha Nebula Filter has been developed exclusively for astrophotography. Especially in heavy light-polluted skies many emission nebulae are only visible and shown in full expanse on astrophotos when using this filter. The H-Alpha nebula filters make astrophotography near the city possible and the use leads to amazingly good image results despite the existing light pollution. A must for every urban astrophotographer.

The EXPLORE SCIENTIFIC nebula filters are delivered with an individual test report - so you can be sure to get high quality filters.

This filter's narrow passband of only 7 nm bandwidth works out the faint emission nebulae or makes them visible even under difficult urban conditions.

FEATURES

H-Alpha filters are used exclusively for astrophotography
Allows photography of emission nebulae that glow in the light of red hydrogen
Many of these emission nebulae are only visible in their full expansion on photos taken with this filter
Blocks almost all artificial light, especially from mercury and sodium vapor lamps
Only allows the emission line of red hydrogen to pass through
Narrow band version for difficult urban conditions
Transmission bandwidth: 7 nm
Allows more contrast and detail for all urban astrophotographers
Ideal for use near cities, in heavy brightened skies
Individual test certificate included to guarantee you receive a premium filter

SCOPE OF DELIVERY

1x 1.25'' H-Alpha Nebula Filter

Batteries required:	0
Colour:	black
Extended warranty (years):	10
Eyepiece Barrel Diameter (mm):	31.7
Field of application [Telescope-filter]:	Light Pollution Filter for Astrophotography
Filter thread size (mm):	31.75
Material:	Glass, Plastic
Net weight (without access.) (g):	10
Telescope filter type:	Nebula filter

Produkt- und Sicherheitshinweise

Manufacturer:
Bresser GmbH, Gutenbergstraße 2, 46414 Rhede

Contact:
www.bresser.de

Warning notes

General safety instructions DANGER Risk of eye injuries! Never look directly at the sun or near the sun through this device. There is a risk of blindness! Children should only use the device under supervision. Keep packaging materials (plastic bags, rubber bands, etc.) away from children! There is a risk of suffocation! FIRE HAZARD! Do not expose the device especially the lenses to direct sunlight! The light concentration could cause fires. RISK of material damage! Do not dismantle the device! In case of a defect, please contact your dealer. They will contact the service center and may send the device in for repair. Do not expose the device to temperatures above 60°C!
Never look at the sun through an eyepiece/telescope without a certified protection filter. A moon filter can never be used for solar observation. The moon filter is only suitable for moon observation. The solar filter must be mounted in front of the telescope opening, not at the eyepiece. Otherwise, the concentrated light beam through the optics will immediately destroy the filter foil, leading to severe eye damage, including permanent blindness.
Never leave the optics unattended. Children and inexperienced adults could point the telescope at the sun without proper precautions and lose their eyesight.
Do not expose the device to high temperatures.

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