Svbony SV220 Dual-Band 7 nm 2 Nebula Filter (SKU: W9172B) Filters for Astronomy opinie

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Svbony 2" SV220 Dual-Band 7nm Nebula Filter is a professional astronomical filter that allows you to photograph planetary and emission nebulae and supernova remnants near cities and other areas polluted by sodium and mercury lamp light.

This filter is characterized by high transmittance for the Hα (656.3 nm) and OIII (500.7 nm) bands, while maintaining the ability to effectively cut out spectral lines emitted by city lighting, significantly improving c thus contrast in the obtained images. The improvement in contrast and detail of photographs is also due to the narrow transmission window, whose half-width for both transmitted lines is only 7 nm. The spectral characteristics selected in this way enable very good separation of red and blue-green light from other undesirable lines, and thus maximize the signal coming from the photographed objects.

The filter can be used with telescopes with a light intensity not exceeding f/5.

The most important features of the Svbony 2" SV220 Dual-Band 7nm Nebula Filter

• two-band nebular filter made of high-quality substrate
• recommended for use with telescopes with a maximum light intensity of f/5
• high transmission for the Hα and OIII lines with a half-width transmittance window of 7 nm
• efficient removal of light pollution

Technical parameters

• filter type: dual-band, nebular
• Filter diameter: 2"
• filter aperture: 44 mm
• filter thickness: 1.80 mm
• pass bands: Hα (656.3 nm), OIII (500.7 nm)
• maximum transmission in the transmittance window for the Hα and OIII lines: >94% and >90%
• half width (FWHM) for Hα and OIII lines: 7 nm
• blocking range: 30 - 1100 nm
• blocked bands: mercury and sodium lamp lines (589 nm; 435 nm; 578 nm)
• optical density equivalent for blocked bands: OD5
• surface finish quality: λ/4
• surface quality index: 60/40
• thread: M48x0.75
• weight: 12.5 g

Set elements

• Svbony 2" SV220 Dual-Band 7nm Nebula Filter

Guarantee

12 months

TEST PHOTO

(click on the photo to see full size)

OBJECT : NGC 2237 Rosette
SETUP
Telescope: Svbony 503 70/400 ED with dedicated flattener
Installation: Sky-Watcher HEQ5 and ZWO ASIAIR Mini
Filter: Svbony 220 DualBand 2" 7 nm
Exposure parameters: 8 hours after 300 seconds, gain 100, cooling to -20 degrees C