Optolong L-eXtreme 1.25" Dual Band Filter
When will I receive it?
Products marked In stock are dispatched promptly — the exact delivery estimate for your address is shown at checkout, before you confirm the order.
For international shipments, delivery times depend on the destination and are always displayed at checkout before payment.
Products marked Available on order require 5–15 business days for processing. Our team will keep you updated promptly if anything changes.
What are the warranty terms?
Shop with confidence: all our products include a 24-month legal warranty for conformity defects, managed directly by our team.
Many brands also offer extended warranty coverage beyond 24 months — contact us to find out the specific terms for the product you're interested in.
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Can I return a product?
Yes: you have 14 days from delivery to return any product and receive a full refund — see our Refund Policy for full details.
Items must be returned in their original condition and packaging. Return shipping costs are the customer's responsibility.
Not sure which product is right for you? Contact us before buying — we'll help you find the perfect instrument so you won't need to return anything.
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Vai al moduloOptolong L-eXtreme 1.25” – 7nm Dual Band Filter for Astrophotography
The Optolong L-eXtreme 1.25” (M28×0.75 – 31.8mm) is a 7nm dual band filter, the evolution of the L-eNhance. It precisely isolates emission lines H-Alpha (656nm), OIII (500nm) and H-Beta (486nm) with up to 90% peak transmission and effective suppression of all artificial and unwanted light.
Compatible with DSLR, color CMOS and mono/color CCD. Perfect for high-contrast nebula imaging even under urban skies.
Technical Specifications
| Filter type | Dual Band (H-Alpha + OIII + H-Beta) |
| Bandwidth | 7nm |
| Peak transmission | Up to 90% |
| Format | 1.25” (31.8mm) – M28×0.75 |
| Thickness | 1.85mm |
| Surface quality | 60/40 (MIL-O-13830) |
| Parallelism | <30" |
| Wavefront RMS | 1/4λ |
| Clear aperture | 26mm |
| Recommended cameras | Color CMOS, DSLR, CCD mono/color |