OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter

OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter

availability:In stock

Shipping: Free Airmail
Dispatch: Ships within 2-5 business days
Estimated Delivery: Between

$271.99

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Product Description

Specifications:

Brand

 OPTOLONG 

Item

 Clear Sky Filter

Size

 77mm

Suitable for

 Use under 3-5 light hazards

Plastic box material

 PP material

Box lining material

 High pressure white EVA material


Applicable Target:

- Wide angle shooting of starry skies in all seasons in an environment with slight light pollution;

- The camera is capable of shooting city night scenes in light-polluted environments.


Manufacturing Process:

- High-precision double-sided polishing – ensuring substrate parallelism better than 30′ and face shape better than λ/4.

- Ultrasonic cleaning of pure water – using 13 tank cleaning process, effectively remove impurities and dust from the substrate surface.

- Ion source-assisted coating – optimizes film density, firmness and uniformity, effectively reducing temperature drift.

- Rigorous quality control – each filter is photometrically spectroscopically verified and laser interferometer type-checked.


Package included:

1 * OPTOLONG 77mm Clear Sky Filter

More Detailed Photos:

OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter
OPTOLONG 77mm Diameter Clear Sky Filter Light Pollution Filter Monocular Telescope Visual Enhance Filter

Additional Information

When you order from Alexnld.com, you will receive a confirmation email. Once your order is shipped, you will be emailed the tracking information for your order’s shipment. You can choose your preferred shipping method on the Order Information page during the checkout process. Alexnld.com offers 3 different international shipping methods, Airmail, Airmail registered and Expedited Shipping Service, following are delivery times:

Airmail and Airmail Registered Area Time
United States, Canada 10-25 business days
Australia, New Zealand, Singapore 10-25 business days
United Kingdom, France, Spain, Germany, Netherlands, Japan, Belgium, Denmark, Finland, Ireland, Norway, Portugal, Sweden, Switzerland 10-25 business days
Italy, Brazil, Russia 10-45 business days
Other countries 10-35 business days
Expedited Shipping 7-15 business days to Worldwide

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