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The H-Beta filter is a narrowband filter designed specifically for visual inspection. It mainly targets the 486nm (blue) spectral nebula. Filtering out interference from other light sources can improve the contrast of the nebula. When observing visually, in order to see a sufficiently dark nebula, it is necessary to ensure a sufficiently large luminous flux and use a large aperture telescope for observation. It is not recommended to use a small aperture telescope for observation. The hydrogen beta line with a center wavelength of 486nm in H-Beta is suitable for observing the Horsehead Nebula and California Nebula in Orion, which are difficult to capture. By using a filter, the Horsehead Nebula can be clearly seen. Filter 2 with metal bracket filter thread; Threaded to fit 2 eyepieces and threaded diagonal barrels
Specifications:
1. Brand: SVBONY
2. Model: SV132
3. Type: H-Beta
4. Size: 2 inches
5. Substrate: B270
6. Substrate thickness: 1.85mm
7. Wavelength range: 400-700nm
8.CWL:486nm±2nm
9. Half width: 25nm ± 2nm
10. T peak: 90%
11. Blocking: OD3 @ 300-1100nm
12. Aperture: 44mm
13. Surface quality: 60/40
14. Surface parallelism: 1/4 λ
15. Parallelism: 30
16. Net weight: 13.2g/0.47oz
The package includes:
SVBONY 2 H-Beta 25nm filter
Durable plastic casing
Logistics information
Our products are located in Hong Kong, China, and the logistics speed depends on your specific location. According to our experience, it usually takes about 15-20 days of transportation time
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How to choose the correct size:
Step 1 Please measure your foot length carefully.
Step 2 Please choose the correct size according to your foot length and chinese size.
For example, If your foot length is 255 mm , you should choose the size 8.
