3D Astro Bahtinov Focus Mask - Available in Various Sizes 40mm-150mm

$7.42 Buy It Now or Best Offer
free,30-Day Returns

Seller Store agenaastro
(19349) 99.5%,

Location: Cerritos, California
Ships to: US,
Item: 144604830880

Restocking Fee:No
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Manufacturer:3D Astro Accessories
MPN:BM-52
3D Astro Accessories:3D Astro Accessories
Type:Accessory

Description Ordering Info USA Shipping International Orders Returns Our eBay Store 1. PRODUCT DESCRIPTION Important notes: Please note that this is a 3d printed product typically made of a plastic material (see item description above for the exact material used). The cosmetic finish on 3d printed items will vary and will not be as polished or smooth as metal items. It is not uncommon to have imperfections such as scratches, scuff marks, or inconsistent surface finish. However, these have no functional impact on the use of the item. 3d printed items should not be subject to very high operating temperatures (for example, left in storage in hot sheds, cars, etc.) and exposure to sunlight should be minimized. Notes on some commonly used 3d printing materials: PLA: Most commonly used material in 3d printing; derived from corn or sugarcane so is biodegradable; basic PLA should not be exposed to over 125° F and exposure to sunlight should be minimized; available in custom formulations that can withstand higher temperatures and solar exposure. PETG: Another very popular 3d printing material; has smoother surface finish; water resistant; should not be exposed to temperatures usually above 160° F. ABS: A strong material used for strong and durable parts; able to withstand temperatures of up to 200º F For more technical info about 3d materials, please visit this link. Important: Please note that this is a 3-D printed plastic mask. More info below. A. About Bahtinov Focusing Masks Bahtinov masks can be a great aid in focusing your guidescope or telescope for astroimaging. With the mask on, you can see a diffraction spike pattern. Focus until you achieve a symetrical spike pattern. Once the best focus has been achieved, you can remove the mask and use the guide scope or telescope normally. B. Selecting the correct Bahtinov Mask for your telescope This mask is designed to be placed on the front (sky-end) of your telescope, spotting scope, guidescope or camera lens for focusing, and should then be removed without disturbing the imaging setup. Hence, do not get a mask that fits snugly or tightly like an end cap. A mask that just sits loosely on the dewshield and which may fall off due to gravity if the scope is pointed downwards is just fine. For this reason, we recommend that you purchase a mask that is 1-3 mm larger that the outside telescope tube or dewshield diameter. To get the proper fit, measure the outside diameter very carefully by using a caliper, ruler, or tape measure. See the 4th product photo above. Measure the widest distance of the telescope tube starting from the exterior of the casing, across the center and to the exterior part of the casing on the other side. Measure using a millimeter (mm) ruler if possible. If you measure in inches, convert to mm by multiplying by 25.4. For example, if your dewshield is 4-1/4″ = 4.25 x 25.4 = 107.95mm in diameter, select a Bahtinov Mask with an inside diameter of 110mm (# BM-110) from the drop-down list above. Again, measure carefully before ordering and select a marginally larger size to avoid disappointment and expensive returns. C. Additional notes Bahtinov masks may not be effective for very small aperture guidescopes (under 50mm) or lenses with short focal lengths. This is a gray area – some people find these useful on small scopes and others, don’t so your mileage may vary and we cannot make any recommendations for small scopes. 3D printed from PLA. Color of current stock is silver-gray but is subject to change without notice. {{widget type= »Magento\Cms\Block\Widget\Block » template= »widget/static_block/default.phtml » block_id= »108″}} Mask Size Products Applicable BM-42 William Optics 32mm Guidescope BM-44 ZWO 30mm f/4 Guidescope BM-52 Askar 40mm Guidescope # FMA180 BM-58 Askar 40mm Guidescope – PRO# FMA180-PRO BM-60 William Optics 50mm Guidescope BM-62 Agena 50mm DLXGS BM-68 ZWO 60mm Guidescope BM-70 Askar 50mm Guidescope # FMA230 BM-82 Takahashi FS-60 BM-84 Sharpstar 61EDPH III Only BM-90 Sharpstar 65PHQ BM-92 Sharpstar 61mm EDPH II Only / Radian Raptor BM-100 Askar 200mm Lens # ACL200 BM-102 Askar 72mm Quintuplet # FRA400 BM-116 Askar 90mm Quintuplet # FRA500 BM-122 Askar 103APO BM-126 Sharpstar Z4 100mm Astrograph # Z4 BM-136 Askar 107mm Quadruplet # 107PHQ BM-148 SkyWatcher Espirit 100mm ED BM-150 Askar 108mm Quintuplet # FRA600 We are in the process of building the table above. If your scope is not listed above, we do not know which mask might work for you. If you have a suggested entry for the table above to help other customers, please do send us an email with this info (scope dewshield/tube diameter and mask size you used). United States Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above. Back to Top 2. ORDERING INFORMATION A. Payment: You can pay via any payment method that eBay accepts. B. Shipping Method: United States Postal Service (USPS) or United Parcel Service (UPS) at your choice and expense (our choice if the item has free shipping option). eBay orders for items over $1,500 can only ship via UPS. C. Order Processing Time: Orders received by 12 noon Mon – Fri US Pacific Time generally ship on the same business day. Orders received after 12 noon PT or on weekends/holidays will ship by the next business day. D. Checkout: Please pay for the item(s) within 3 days from your account on eBay or by using the link in the email you receive from eBay. E. Shipping Discount: We offer combined shipping if you order multiple quantities/items and if items can be combined. eBay will automatically show you the correct combined/discounted shipping costs when you check-out. F. Combining Purchases: You can combine shipping for items purchased from us on eBay within 3 days. Buy the items individually and check out together for all items. eBay will combine the shipping weights and show you the discounted shipping cost. You must check out for all items together via eBay for this. We cannot combine shipping costs if you check out individually for your purchases. G. Sales Tax/VAT: Sales tax or VAT may be charged and collected by eBay as required by law based on your ship-to address and local tax/VAT rates. Please check with eBay. Back to Top 3. US SHIPPING A. Delivery Time: USPS First Class shipments will generally take 3-5 business days to arrive after we ship it. Priority Mail shipments will generally take 2-3 business days. However, these delivery times are NOT guaranteed by the USPS. Delays of up to 2 (or sometimes even 3) weeks can occur in about 5% of the shipments due to Covid, operational, or other issues. UPS shipments will generally take between 1 and 6 business days to be delivered depending on the method you select. USPS and UPS do NOT offer any refunds for shipping/delivery delays for ANY reason (except for UPS Next Day Air service). Delays are out of our control once your order ships. B. Tracking/Delivery Confirmation:eBay will update you once your order ships. You can see the order status or tracking information/link from your eBay account at any time. C. USPS Tracking Limitations: Please note that is common for USPS tracking to show “Shipping Label Created, USPS Awaiting Item” or “Shipment Received, Package Acceptance Pending” even several days after your order ships. This does not mean that there is a problem with your order or that we have not handed over your package to USPS yet. This simply means that your package is en route without an outbound scan and tracking will not be updated until the package reaches a distribution center at your end several days later. Back to Top 4. INTERNATIONAL ORDERING / SHIPPING A. Shipping Cost: Click on the « Shipping and Payments » tab above and select your country to see your shipping choices and cost. If you need a shipping cost estimate for multiple items, please contact us. B. Delivery Time: Please note that eBay’s delivery estimates shown are generally too optimistic! 1. UPS (All Shipping Methods): We strongly recommend the use of UPS for international orders due to issues related to the ongoing Covid situation. Delivery time usually varies between 3-7 business days depending on your country and the exact shipping method you select. 2. USPS First Class International: First class packages will usually be carried by GlobalPost (a USPS international delivery partner) for most of the way. Delivery at your end will be handled by your local postal service. Delivery generally takes about 3-4 weeks after we ship your package. This can frequently take 4-6 weeks or more for several countries (8 weeks for Italy, Argentina, and South Africa; 8-12 weeks for Brazil). There is very limited tracking available for 1st class shipments and there is no inquiry/tracing service. Once your package ships, we can do nothing but wait until your package arrives. Please do not become impatient and contact us in 2-3 weeks if your package has not arrived. If you don’t receive the package in 6-8 weeks, contact us and we will work with you to resolve the issue. If you don’t want to take the risk of this delay or lack of tracking, DO NOT USE First Class mail – use Priority or Express shipping, or better still, UPS instead. Packages are not considered lost unless 60 days have elapsed from the date of shipment. 3. USPS Priority Mail International: Delivery takes about 2 weeks to most countries after we ship your package. This can sometimes take 3-4 weeks to several countries. The USPS provides some basic tracking information for Priority shipping. Packages are not considered lost unless 60 days have elapsed from the date of shipment. 4. USPS Express Mail International: Delivery usually takes 5-10 business days after we ship your package. Packages are not considered lost unless 30 days have elapsed from the date of shipment. Again, these delivery times are NOT guaranteed by the US Postal Service. The most common reason for delays is slow customs inspection and clearance in your country, and can be very long, even for Express mail packages. Upon shipping your order, delivery delays are beyond our control, so do not leave us negative feedback or file a claim if your package is delayed. Delays are quite common but losses are very rare, so your patience and understanding will be greatly appreciated. C. Brokerage Fees, Customs and Duties: You are responsible for any carrier brokerage fees and duties/taxes that may be levied in your country. These are not included in our item price or shipping cost. UPS brokerage fees can be quite hefty. We have no control over these charges and cannot predict what they may be or if they will be levied upon delivery. Customs policies vary widely from country to country (Some countries such as UK are strict about imposing hefty customs duties). It is your responsibility to check with your country’s customs office to determine what these additional costs will be prior to buying. Customs fees are normally charged by the delivery company or your country’s postal service or collected when you pick the item up. These fees are NOT additional shipping charges. Back to Top 5. RETURN/EXCHANGE POLICY A. US Orders: Returns must be shipped back within 30 days. All returned items must be in brand new, resalable condition with original manufacturer’s packaging. A minimum restocking fee of 10% will be deducted if there is any evidence of use or wear, dirt, scratches, missing packaging/parts, etc. We may levy a larger restocking fee if the condition warrants it, or even refuse returns entirely if returned in heavily used/abused condition. Shipping fees are non-refundable (for items with free or discounted fixed shipping, the actual outbound S&H cost we incurred will be deducted) and you are responsible for all return shipping costs. Please contact us first before returning an item. B. International Orders: No returns/exchanges accepted unless the item we shipped is defective. Please research the product and ask us any questions BEFORE you purchase to make sure you are buying the correct item for your needs. Back to Top Click any image below to view hundreds of products in our eBay Store…

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