Auminum Alloy Bahtinov Focusing Mask for Astronomical Telescope Observable Diameter 60mm-270mm

$45.93

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Description

Auminum Alloy Bahtinov Focusing Mask for Astronomical Telescope Observable Diameter 60mm-270mm


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

A27-60

60mm

65mm-93mm

A27-80

80mm

85mm-123mm

A27-100

100mm

105mm-152mm

A27-120

120mm

121mm-165mm

A27-140

140mm

141mm-185mm

A27-160

160mm

161mm-205mm

A27-180

180mm

180mm-220mm

A27-200

200mm

201mm-252mm

A27-230

230mm

231mm-281mm

A27-270

270mm

271mm-321mm


Payment Policy

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:

Major Credit & Debit Cards (Visa, MasterCard, American Express)

Secure Online Payment Gateways (such as PayPal, Stripe, or other providers available at checkout)

Any additional payment methods displayed during checkout

All payments must be completed in full at the time of purchase.

2. Secure Transactions

All transactions are processed through encrypted and secure payment systems to protect your personal and financial information. We do not store your full payment details on our servers.

3. Currency

Prices are displayed in the currency indicated on the website. If you are purchasing from another country, your bank may apply currency conversion fees.

4. Order Confirmation

Once your payment has been successfully processed, you will receive an order confirmation email containing your purchase details.

5. Failed or Declined Payments

If your payment is declined, please verify your billing information or contact your bank. Orders will only be processed after successful payment confirmation.

6. Fraud Prevention

BILLIONS BIRDS reserves the right to cancel or refuse any order if fraud or unauthorised activity is suspected.


Delivery Policy

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.

4. Tracking Information

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

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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