Description: The H-Beta filter is a narrowband filter specially designed for visual inspection. It is mainly aimed at the 486nm (blue) line spectrum nebula. It filters out the interference of other light and can improve the contrast of the nebula. During visual observation, in order to see a sufficiently dark nebula, it is necessary to ensure a large enough luminous flux, and it needs to be observed with a large-aperture telescope. It is not recommended to use a small-aperture telescope for observation. The beta line of hydrogen with a central wavelength of 486nm in H-Beta is suitable for observing the difficult-to-capture Horsehead Nebula in Orion and the California Nebula. Through the use of filters, the Horsehead Nebula can be clearly seen. Filter with metal mount 2" filter threads; about svbony
Price: 266.63 USD
Location: Rowland Heights, California
End Time: 2023-10-16T07:12:27.000Z
Shipping Cost: N/A USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
Size: 2.0 in
Country/Region of Manufacture: China
Compatible Brand: Universal
Type: H-Beta
Compatible Model: Uniserval
Features: Padded
Compatible Series: Universal
MPN: F9102B
Substrate: 5.B270
Substrate Thickness: 6.1.85mm
Wavelength Range: 7.400-700nm
CWL: 8.486nm±2nm
FWHM: 9.25nm±2nm
T peak: 90%
Blocking: OD3 @300-1100nm
Clear Aperture: 12.44mm
Surface Quality: 13.60/40
Surface parallelism: 14.1/4λ
Brand: SVBONY
Parallelism: 15.30"
Net Weight: 16.13.2g / 0.47oz
Thickness: 1.85mm
