Includes all taxes
Telescope Auminum Alloy Bahtinov Focusing Mask Observable Diameter 60/80/100/120/140/160/180/200/230/280mm
Feature:
1. The Bahtinov Mask Made of aluminum alloy, not plastic. And it has whole anodizing aluminium process, which is durable and has good performance in long-term use.
2. This focusing mask can be used for a variety of purposes, such as camping, hiking, fishing, hunting, and other outdoor activities.
3. Masks now feature 3 holes which can be attached with 3 screws to prevent the mask from falling all the way to the ground
4. Perfect focusing for your CCD, DSLR or Webcam in seconds
5. Light weight so you wont upset the balance on your scope
6. Suitable for telescopes front end diameter 60mm to 330mm according to different sizes
7. Universal adaptation, 3 bolts with plastic cover allow the mask to be simply attached to any telescope
8. Aluminium alloy material thickness: 1.5 mm
9. Color: Black
Note :
1. When you buy it, you need to check your out-diameter of the tube. Not just the Objective lens diameter, because you need to put the item on the tube.
2. If you don't know which size should to choose you can ask us before buying it, Thanks
3. Place the Bahtinov Focus-Mask over the end of your telescope, then locate a bright star near your target, take a 3-5 seconds picture and view the diffraction spikes. Change your focus, take another picture and again, view your diffraction spikes. Is the center spike moving further from center? Then change the direction your focusing and try another picture. Watch the direction the spikes are moving and when the center spike passes the middle of the other two spikes, change direction and fine tune your tuning knobs until the center spike is in the middle. Your now in perfect focus.
SKU | Observable Diameter | Fixed Range | Sample compatible telescopes |
A27S-60 | 60mm | 65mm-103mm | small camera lenses or small refractors like the TS 50mm APO. INED70 or other 60-80mm refractors etc |
A27S-80 | 80mm | 85mm-125mm | 80γ100 or 120mm ED Skywatcher and other refractor |
A27S-100 | 100mm | 99mm-157mm | 100γ120mm Skywatcher refractors Celestron 4 SE |
A27S-120 | 120mm | 121mm-180mm | 127mm Celestron or Skywatcher Maksutovs. meade 127 ED APO. Celestron 5SE |
A27S-140 | 140mm | 151mm-201mm | 6' Skywatcher or Celestron Newton C6 SCT |
A27S-160 | 160mm | 170mm-220mm | 7' Maksutovs |
A27S-180 | 180mm | 190mm-240mm | 8'Skywatcher or Celestron Newton |
A27S-200 | 200mm | 210mm-265mm | 8'Skywatcher or Celestron Newton. C8 SCT |
A27S-230 | 230mm | 240mm-291mm | 10' Skywatcher or Celestron Newton. C925 SCT |
A27S-280 | 280mm | 275mm-330mm | 12" Skywatcher Newtonians. C11 SCT |
Payment Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are committed to providing a safe, secure, and seamless payment experience for our customers.
1. Accepted Payment Methods
We accept the following payment options:
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Delivery Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are dedicated to delivering your orders safely and efficiently.
1. Order Processing
All orders are processed within 1–3 business days after payment confirmation. Orders are not processed or shipped on weekends or public holidays.
2. Shipping Times
Estimated delivery times vary depending on your location:
Domestic Shipping: 3–7 business days
International Shipping: 7–15 business days
Please note that delivery times are estimates and may vary due to customs procedures, carrier delays, weather conditions, or other unforeseen circumstances.
3. Shipping Costs
Shipping fees are calculated at checkout based on your location and selected shipping method. Any customs duties, taxes, or import fees are the customer's responsibility.
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Once your order has been shipped, you will receive a confirmation email with tracking details (if available) so you can monitor your package.
5. Delivery Issues
If your order is delayed, lost, or arrives damaged, please contact us within 7 days of the expected delivery date. We will work with the shipping carrier to resolve the issue as quickly as possible.
6. Incorrect Shipping Information
Customers are responsible for providing accurate shipping details at checkout. BILLIONS BIRDS is not responsible for orders shipped to incorrect addresses provided by the customer.
Refund Policy – BILLIONS BIRDS
At BILLIONS BIRDS, customer satisfaction is our top priority. If you are not completely satisfied with your purchase, we’re here to help.
1. Return Eligibility
You may request a return within 14 days of receiving your order. To qualify for a return:
The item must be unused, unworn, and in the same condition as received.
The item must be in its original packaging.
Proof of purchase (order confirmation or receipt) is required.
Certain items may not be eligible for return, including clearance items, gift cards, or personalised/custom products.
2. Non-Refundable Items
The following items are non-refundable:
Final sale or discounted items
Gift cards
Items damaged due to misuse, negligence, or improper care
3. Return Process
To initiate a return, please contact our customer support team with your order number and reason for return. If your return is approved, you will receive instructions for returning the item.
Unless the item is defective or incorrect, customers are responsible for return shipping costs.
4. Refund Processing
Once we receive and inspect your returned item:
We will notify you of the approval or rejection of your refund.
If approved, the refund will be issued to your original payment method within 5–10 business days.
Please note that banks or payment providers may require additional time to process refunds.
5. Damaged or Incorrect Items
If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery and provide clear photos of the product and packaging. We will arrange a replacement or full refund at no additional cost.
6. Late or Missing Refunds
If you have not received your refund:
Check your bank account again.
Contact your credit card company or payment provider.
If the issue persists, don't hesitate to contact our support team for assistance.
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