Explore Scientific HR Variable Coma Corrector (2-inch)
After hours at the eyepiece, you finally get to view the fruits of your astrophotography labors. The stars in the center of the field pop like brilliant precise points of light. But as you survey the image, you notice the stars at the edge have taken on an unnatural comet-like shape. Your long night has been marred by coma. Coma is a common plague of the Newtonian reflector design, and its annoying presence at the outskirts of an image can be a bane for astronomers of all levels.
Explore Scientific’s HR Variable Coma Corrector is a high-performance optical corrector designed by world famous optical designer Harrie Rutten, and it will help you minimize or even eliminate image aberrations caused by this off-axis optical phenomenon even in fast Newtonians. This 2-inch coma corrector with is EMC Coated to reduce internal reflections and its spacer with markings allow you to use the device on almost any Newtonian telescope with a parabolic primary mirror, even fast Newtonians such as the BRESSER N20839 f/3.9 Photo Newtonian. Tightly secured by three thumbscrews, this accessory comes with two adapters (M42x0.75 and M48x0.75) to secure to your T adapter and a protective cap.
Shipping to the UNITED STATES (Lower 48 States):
We offer Free U.S. Shipping on most orders over $100 USD. Some limitations may apply.
Shipping to CANADA:
We currently offer Free Canadian Shipping on most orders over $100 USD. Some limitations may apply.
After your order is placed, you will receive an order confirmation email, which will contain your Order #. After your payment is processed, your order will typically ship within the next 1-3 business days (excluding Holidays) for US orders & Canadian orders.
If you did not receive an order confirmation email, please be sure to check your spam folder. If you still can't find any emails from us, please reach out to our support team at email@example.com.
Orders will typically ship with either FedEx or UPS Ground. Additionally, most high-value shipments will require a signature upon delivery.
Shipping Transit Time:
Shipping times can vary depending on the product that you purchase. In most cases, you will receive your product(s) in around 3-5 business days after it has been shipped - for US orders, and 5-10 business days - for Canadian orders.
Faster Shipping Requests:
If you would like to request a faster shipping method that is not available as an option on our online checkout, please reach out to us at firstname.lastname@example.org, and we can provide a quote.
Please note: We currently only ship within the contiguous United States (lower 48 states) & Canada. Some shipping restrictions may apply on specific brands & products. If you have any questions, please don't hesitate to email email@example.com, and we'll be happy to help.
After your order has been shipped to the final destination, regular tracking updates will be sent to the email address that was used to place the order.
After you receive your Tracking #, it may take up to 24-48 hrs for the Carrier to display Tracking updates.
Order & Pre-Order Cancellation Requests:
Any orders and/or pre-orders that haven't shipped yet, but that are cancelled & refunded by request of the customer, may be subject to a minimum 5% re-stocking fee. The re-stocking fee will be deducted from your refund.
If the order has already shipped, then please refer to our Returns & Refund Policy below for full details.
If you purchase a product from us with a Custom Engraving option selected (such as text engraving or artwork engraving, we will reach out to you right after your order is placed to request your engraving instructions.
If we do not receive your engraving instructions within 2 business days after we request them, we will proceed with shipping your order without engraving. If you receive your order, and decide that you would like engraving, you will be responsible for shipping the product back to our facility in order to have the engraving completed.
Returns & Refund Policy
We believe in the brands that we work with and the products that we sell. And we want YOU to be 100% satisfied! This is why we offer a 30-Day Return Policy for the vast majority of the Brands/Products that we carry. See below for details regarding products that do NOT qualify for our 30 day Returns Policy.
Processing Returns (IMPORTANT):
To initiate a return, you MUST obtain an RMA number and the correct return address from us (we will provide both of these). Any returned shipments that do not contain a valid RMA number will not be accepted. NOTE: Items must be returned in their original packaging and condition.
To retrieve an RMA number, or for more details, please contact us at firstname.lastname@example.org!
If you would like to return your purchase for any reason within 30 days of receiving the product(s), we can only grant a refund if the items are returned in their original packaging and condition. To confirm that products are in their original packaging and condition, we may ask you (the customer) to provide photographs of the items before they are returned to us.
Refunds will be issued after the warehouse receives, inspects and processes your return (this may take upwards of 5-7 business days).
The customer will be responsible for covering both the return shipping costs with FedEx or UPS, as well as the shipping costs associated with originally shipping the item(s) to them (the customer). Additionally, a minimum 5% re-stocking fee may apply.
If you wish to exchange the item for another product within 30 days of receiving it, we can likely wave any re-stocking fees (depending on the condition of the product), and we can help reduce or wave any return shipping fees. However, in some cases, these fees may still apply. Please email us for full details at email@example.com.
When you receive your product(s), you should immediately inspect it to ensure that nothing is damaged or that your shipment isn't missing anything (additional products or accessories).
If you notice any damage upon delivery, please send photos to firstname.lastname@example.org as soon as possible and we will make the arrangements necessary to have your product returned, and have a replacement shipped to you at no extra cost!
Brands/Products that do NOT qualify for our 30 Day Return Policy:
Full Moon Optics
Full Moon Optics products do not qualify for our 30 day return policy. However, they instead qualify for a 14 day return policy.
APM products do not qualify for our 30 day return policy. However, they are covered by APM's 2 year limited warranty.
Athlon Optics products do not qualify for our 30 day return policy. However, if a product has a manufacturing defect or is damaged, we can have the product returned, repaired, and shipped back to you (alternatively, we can have an entirely new replacement product shipped to you) - as per Athlon's Lifetime Warranty.
Konus products do not qualify for our 30 day return policy. However, most of the Konus products that we carry include either a 2-year warranty, or lifetime warranty.
First Texas Products (Night Owl Optics / Bounty Hunter / Teknetics / Fisher Lab)
First Texas Products (Night Owl Optics / Bounty Hunter / Teknetics / Fisher Lab) do not qualify for our 30 day return policy. However, most Night Owl Optics, Bounty Hunter, Teknetics, and Fisher Lab products carry a minimum 1 year warranty (with some products carrying a 5 year warranty).
Newcon Optik products do not qualify for our 30 day return policy. However, all Newcon products carry a comprehensive 1 year warranty.
Refurbished products do not qualify for our 30 day return policy. All sales are final.
Additionally, items that are special ordered, customized, or engraved - cannot be returned or refunded under our 30 day return policy.
If your engraved item needs to be repaired within 30 days of purchase, please reach out to us and we will have the product repaired or replaced, re-engrave if necessary, and return it to you in mint condition!
If you have any questions regarding our Returns & Refund Policy, please feel free to reach out to us at email@example.com.
If you encounter a Warranty issue with any products that you have purchased from us, we will gladly serve as the liaison between you and the Manufacturer. This will ensure that you receive the best, and most attentive, service possible.
Please don't hesitate to reach out to us with any questions that you may have regarding Warranty. You can reach out to us via email, live chat, or give us a call during our posted hours at 1-800-860-3429.
OUR PRODUCTS INCLUDE THE FOLLOWING WARRANTY:
Your product is not only warranted to be free of defects in materials and workmanship for the lifetime of the product. Athlon will also repair or replace, at no charge to you, your product if it becomes damaged through normal use. No receipt needed, no registration required. This is a commitment that Athlon will be the best product you can buy for your money.
APM products are covered by a 2-year limited warranty.
Barska being the manufacturer outlet honors Manufacturer warranties for Repair and/or new Replacement after the 30 day Standard Return Policy is expired. Please read the Warranty Card enclosed with product for details.
NOTE: Refurbished Products do not qualify for Barska's warranty policy or 30 day return policy.
Binoculars – No-Fault Warranty
Binoculars – (Battery operated) One-Year Limited Warranty
Magnifiers – Limited Lifetime Warranty
Telescopes – One-Year Limited Warranty
EXPLORE SCIENTIFIC / EXPLORE FIRSTLIGHT / BRESSER / ALPEN OPTICS / NATIONAL GEOGRAPHIC:
Telescopes: *Limited* USA One Year Warranty once registered within 60 days
Microscopes: *Limited* USA One Year Warranty once registered within 60 days
Riflescopes: *Limited* USA Five Year Warranty once registered within 60 days
Waterproof Riflescopes: *Limited* Lifetime USA Warranty if registered within 60 days
Binoculars & Spotting Scopes: *Limited* USA Five Year Warranty once registered within 60 days
Waterproof Binoculars & Spotting Scopes: *Limited* Lifetime USA Warranty if registered within 60 days
Laser Rangefinders, Cameras and Electronics: *Limited* USA One Year Warranty once registered within 60 days
FULL MOON OPTICS:
Full Moon Optics products carry a limited 3 year warranty on all parts except the thermal core (thermal core include a 1 year warranty).
BOUNTY HUNTER / TEKNETICS / NIGHT OWL OPTICS:
Bounty Hunter, Teknetics, and Night Owl Optics products are covered by a minimum 1 year warranty. Some Metal Detectors are covered by a 5 year warranty.
GERMAN PRECISION OPTICS (GPO):
GPO, USA is 100% confident that all our product will not only function perfectly, but will exceed your expectations. Therefore, GPO, USA has created an industry leading Spectacular Lifetime Warranty™. With outstanding professional service, we will take of our products before, during and after your purchase at no charge to you, EVER. If your product is not functioning properly, GPO, USA will repair or replace it with a product in perfect working condition.* We at GPO know that you have chosen to trust us by purchasing one of our premium products and we understand that this trust is important. The GPO, USA Spectacular Lifetime Warranty™ applies to every GPO product bought in the United States, no matter where you purchased it, no matter how long you have had it. In addition to this “best in class” service, GPO trusts our retail partners to also service your needs. If you prefer to return a damaged or non-functioning GPO product to the retailer where you have purchased your optic, GPO authorizes the retailer to replace your item “on the spot”. This level of service is unsurpassed in the industry. Trust in GPO. You will not be disappointed.
All Newcon Optik products carry a comprehensive 1 year warranty.
All Luna Optics products carry a limited 1 year warranty.
All Levenhuk Telescopes, Microscopes, Binoculars and other optical products, except for accessories, carry a Lifetime Warranty against defects in materials and workmanship. Lifetime warranty is a guarantee on the lifetime of the product on the market. All Levenhuk accessories are warranted to be free of defects in materials and workmanship for six months from date of retail purchase. Levenhuk will repair or replace such product or part thereof which, upon inspection by Levenhuk, is found to be defective in materials or workmanship. As a condition to the obligation of Levenhuk to repair or replace such product, the product must be returned to Levenhuk together with proof of purchase satisfactory to Levenhuk.
This warranty does not cover consumable parts, such as bulbs (incandescent, LED, halogen, energy-saving and other types of bulbs), batteries (rechargeable and non-rechargeable), electrical consumables, etc.
LUNT SOLAR SYSTEMS:
This Warranty is extended by LUNT Solar Systems LLC to the original purchaser of the LUNT Solar Systems LLC product. LUNT Solar Systems LLC does not provide warranty service to used or second hand equipment. Lunt Solar Systems LLC warrants its products to be free of manufacturing and workmanship defects under normal use for a period of 5 years from the date of purchase. LUNT Solar Systems LLC will repair or replace such product or part thereof which upon inspection by LUNT Solar Systems LLC, is found to be defective in materials or workmanship.
This warranty does not extend to any product whose serial number has been defaced or altered, or to any product which LUNT Solar Systems LLC determines to contain a defect or malfunction caused by damage while in the possession of the consumer, this includes de-contacting of etalon. De-contacting of the etalon only occurs if the product is subjected to shock, i.e. dropped and/or banged. The above descriptions may include incorrect installation, maladjustment, misuse, negligence or servicing by the consumer, or by a failure on the part of the consumer to provide reasonable and necessary maintenance. Further, LUNT Solar Systems LLC reserves the right to disallow any products from warranty coverage that are deemed to have been received by the end customer in other than factory-sealed condition. All products are to be inspected by the customer when purchased. LUNT Solar Systems LLC is not responsible for damages or loss during the shipping process.
Castle Navigation Inc. is only acting as a distributor of products manufactured by other companies. Thus, Castle Navigation Inc. expressly limits its guarantees and warranties for products sold hereunder to those extended and allowed by the manufacturing company to be passed through to Seller's customers. THERE ARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION OF THE FACE HEREOF. CASTLE NAVIGATION INC. DISCLAIMS AND EXCLUDES FROM ANY SALE OF PRODUCTS HEREIN ANY IMPLIED WARRANTIES OF MERCHANTABILITY, OR OF FITNESS OR SUITABILITY FOR ANY PARTICULAR PURPOSE OR USE. Since Castle Navigation Inc. cannot control the manner or use of its products after sale, Castle Navigation Inc. will not be responsible for any direct, consequential, or indirect damages to the purchaser or any third party or ultimate user of the products. Castle Navigation Inc. will, at its option, either replace the goods sold or refund the purchase price should a product defect be brought to its attention within 30 days after sale. All warranties cover only defects arising under normal use and do not include malfunctions or failure resulting from misuse, abuse, neglect, alteration, usage not in accordance with Limitation of liability, acts of nature, unusual temperatures or humidity, improper installation, or damage determined by Castle Navigation Inc. to have been caused by the customer, or repairs made by anyone other than Castle Navigation Inc., or you with the assistance of Castle Navigation Inc. technical support. Castle Navigation Inc.'s responsibility under its limited warranties is limited to repair or replacement, either of which may be selected by Castle Navigation Inc. at its sole discretion. Any parts replaced by Seller become the property of Seller. All limited warranties granted on Products are to the initial customer end-user and are non-transferable. Customer agrees to indemnify and hold seller harmless from all claims, judgments, liabilities, expenses, or costs arising from customer’s breach of these terms and conditions of sale and/or acts or omissions.
WEEMS & PLATH:
More than half of Weems & Plath products carry a lifetime warranty, while other products carry a 2-year warranty.
To initiate a return on an item that is covered by warranty, you MUST obtain an RMA number and the correct return address from us (we will provide both of these). Any returned shipments that do not contain a valid RMA number will not be accepted.
To retrieve an RMA number, or for more details, please email us at firstname.lastname@example.org!