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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.
FEATURES
SCOPE OF DELIVERY
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
Technical Data
| OPTICAL SPECIFICATIONS | |
|---|---|
| Filter thread size | 31.75 mm |
| GENERAL TECHNICAL DATA | |
| Colour | black |
| Eyepiece Barrel Diameter | 31.7 mm |
| Material |
|
| Extended warranty | 10 years |
| DIMENSIONS & WEIGHTS | |
| Net weight (without access.) | 10 g |
Technical Data
| OPTICAL SPECIFICATIONS | |
|---|---|
| Filter thread size | 31.75 mm |
| GENERAL TECHNICAL DATA | |
| Colour | black |
| Eyepiece Barrel Diameter | 31.7 mm |
| Material |
|
| Extended warranty | 10 years |
| DIMENSIONS & WEIGHTS | |
| Net weight (without access.) | 10 g |
Product reviews
EXPLORE SCIENTIFIC 1.25" H-Alpha Nebula Filter 7nm
What our customers say:
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