Optolong H-Alpha 7nm 1.25" (31.8mm) v.2
When does the delivery take place?
Delivery times vary depending on the country and destination postal code. They will be shown at checkout and apply only to products currently in stock.
For products marked as Not in stock, processing may take between 5 and 15 days. If delays occur, our customer service will contact you with timely updates.
What are the warranty terms?
All our products come with a 24-month legal warranty. Some brands provide extended warranty. Contact us for more info.
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Can I return a product?
You have the right to return a product within 14 days from delivery, as stated in our Refund Policy. Return shipping costs are the responsibility of the customer. Items must be returned in their original condition and packaging. Please contact us before returning.
Bester H-alpha-Linienfilter für die Astrofotografie von Emissionsnebeln mit höchstem Kontrast und der Wiedergabe zartester Nebeldetails.
♦ schmalbandiger (<=7 nm) Linienfilter für wichtige Nebellinie
♦ bevorzugt für CDD-Kameras mit Full-Frame-Transfer-Technik
♦ 2 mm dick und somit homofokal mit vielen anderen Filtern von Optolong
♦ Interferenzfilter
♦ feinoptisch poliert
♦ mehrschichtig hartvergütet - reflexfrei und weitgehend kratzfest
Specifications
- CWL(centre wavelength): 656.3nm
- Fwhm: 7nm
- Tpeak: <85%
- Coating Wavelength: 300-1100nm
- Optical Denisity: OD3
- Surface Quality: 60/40
- Transmitted Wavefront RMS: λ/4
- Parallelism (arcsec): 30s
Reference Spectrum
Manufactruring Technique
- Fine-optically polishing for double-sides—— Ensure accurate λ/4 wavefront and <30 seconds parallalism over the both surfaces
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Ultrasonic wave cleaning substrate with purified water—— Cleanup by 13 purified water tank to remove inpurities and dust effectively
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Iro source assisted coating—— For durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.
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Constantly stringent quality testing processes—— Each filter was tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product
Package Details
- Silver Cardboard Box
- Plastic PP Case
- Imported high pressure EVA case lining