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GSO 8\" f/6 Parabolic Primary and 50mm Secondary Mirror Set for Telescope For Sale


GSO 8\
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GSO 8\" f/6 Parabolic Primary and 50mm Secondary Mirror Set for Telescope:
$235.00

GSO 8\" f/6 Parabolic Primary and 50mm Secondary Mirror Set for Telescope GSO 8\" f/6 Parabolic Primary and 50mm Secondary Mirror Set for Telescope

Description Ordering Info USA Shipping International Orders Returns Our eBay Store1. PRODUCT DESCRIPTION

This set contains the following products:

  • GSO Parabolic Primary Mirror - 8\" f/6
  • GSO Elliptical Secondary Mirror - 50mm (minor axis diameter)

Please note that only these two items are included. The other items referred to in the description and specification tables below or shown in the photos are sold separately.

For years, GSO has made dobsonian telescopes sold under various labels. Users of these scopes know the excellent quality of the optics included, and they have a well-deserved reputation for being the finest mirrors in their price range. We are now pleased to offer virtually the entire line of GSO\'s Newtonian optics in the US market.

GSO\'s parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6” to 16” and offered in various f-ratios, these mirrors are made from optical grade BK-7 glass. All mirrors have a reflective aluminum coating with a reflectivity of 92-93%. The aluminum coating is protected by a silicon oxide (SiO2) over-coating. GSO\'s elliptical flat mirrors have the same high quality as their parabolic primary mirrors.

GSO uses high-volume, state-of-the-art, high quality manufacturing and test lines. GSO guarantees diffraction limited performance, but their mirrors typically have a mirror surface quality of 1/16 wave RMS at least, and often better. This very smooth mirror surface results in excellent optical performance with practically no light scatter.

Please Note:

Most parabolic mirrors will have 2-4 minor uncoated areas along the edge of the mirror. See photo 3 above for an example. These are caused by the clips used to hold the mirrors in the coating chamber. Note that these are not defects. A couple of these uncoated edge strips will typically be covered up by the clips in your mirror cell anyway.

Additional Information:

Q. Is a test report included with each mirror?
A. No. GSO tests each mirror via laser interferometry before shipping, but does not provide individual test reports.

Q. Is the primary center-dotted?
A. Sometimes yes but mostly no. It just varies from batch to batch.

You can easily center-dot the primary yourself if the mirror you receive is not dotted. Instructions to do this are readily available on the internet. If you want a center-dotting sticker, just request one from us at the time you place your order.

If you want a mirror that does not have this center dot, please check with us before your purchase. Removing the center dot is not easy or recommended. If the mirror already has a center dot but you do not want it, we recommend that you not purchase this item.

Specifications of GSO Primary MirrorsPart NumberApertureFocal RatioMirror DiameterFocal LengthMirror ThicknessMirror WeightSuggested Secondary SizeAD0966\"f/4153mm600mm20mm1lb-14oz (847g)62.5mmAD0466\"f/5153mm750mm20mm2lb-1oz (941g)50mmAD0456\"f/6153mm900mm20mm2lb (921g)50mmAD0116\"f/8153mm1200mm20mm2lb (921g)31mmAD0488\"f/4200mm800mm24mm3lb-15oz (1794g)70mmAD0498\"f/5200mm1000mm24mm4lb-1oz (1831g)62.5mmAD0828\"f/6200mm1200mm24mm3lb-13oz (1717g)50mmAD09410\"f/4250mm1000mm34mm9lb-2oz (4126g)88mmAD08110\"f/5250mm1250mm34mm8lb-9oz (3891g)62.5mmAD09512\"f/4304mm1200mm38mm14lb-8oz (6574g)88mmAD01712\"f/5304mm1500mm38mm14lb (6348g)70mmAD01516\"f/4.5406mm1800mm45mm28lb-14oz (13092g)88mmNotes:
Actual measurements can vary by a little bit from all values shown above due to manufacturing variations.
Actual coated mirror diameter will be 2-3 mm less than the Mirror Diameter listed above.

Specifications of GSO Secondary MirrorsPart NumberMinor Axis DiameterApprox. Major Axis DiameterApprox. ThicknessMirror WeightAD04128mm38mm5mm0.3oz (9g)AD01231mm43mm8mm0.7oz (20g)AD06446.5mm65mm10mm2.1oz (60g)AD00750mm70mm10mm2.3oz (65g)AD04762.5mm88mm12mm4.5oz (128g)AD09168mm95mm15mm6.7oz (190g)AD00970mm97mm12mm5.5oz (156g)AD09274mm104mm16mm8.2oz (232g)AD09380mm114mm18mm11.5oz (326g)AD03788mm122mm20mm14.5oz (411g)AD018104mm145mm17mm18.2oz (515g)


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.

Description copyright: Agena AstroProducts - Reproduction without permission prohibited.

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2. ORDERING INFORMATION

Payment: We only accept Paypal and major credit cards through Paypal.

Shipping Method: United States Postal Service (USPS), unless otherwise specified.

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.

Shipping Discount: We offer shipping discounts if you order multiple quantities/items. eBay will automatically show you the correct, discounted shipping costs when you check-out.

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 after you check out individually for your purchases.

Sales Tax: 8.5% sales tax added if your Ship-To address is in California.

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3. US SHIPPING

Delivery Time: Most orders ship within 1 business day of receiving payment. First Class shipments will take 3-5 days to arrive after we ship it. Priority Mail shipments will take 2-3 days. However, these delivery times are NOT guaranteed by the USPS. Delays of up to 2 weeks can occur in about 5% of the shipments.

Tracking/Delivery Confirmation:eBay will update you once your order ships. You can see the order status or tracking information from your eBay account at any time.

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4. INTERNATIONAL ORDERING / SHIPPING

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.

Delivery Time:

1) USPS First Class International: Delivery 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 NO TRACKING FOR FIRST CLASS SHIPMENTS. The information shown in your eBay account is just a customs form number - it is NOT a tracking number as incorrectly indicated by eBay. 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 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, then DO NOT USE First Class mail - use Priority or Express shipping instead.

(2) USPS Priority Mail International: Delivery takes 1 - 2 weeks 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.

(3) USPS Express Mail International: Delivery usually takes 5-10 business days after we ship your package. You will receive a tracking number with which you can track your shipment from USPS.com. Note: If you use this option, you must send us your phone number when you check-out or else your shipment will be delayed. This is required for international postal forms.

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 Paypal claim if your package is delayed. Delays are quite common but losses are very rare, so your patience/cooperation will be greatly appreciated.

Customs and Duties: You are responsible for any duties and taxes that may be levied in your country. These are not included in the item price or shipping cost. 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 bidding or 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.

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5. RETURN/EXCHANGE POLICY

US Orders:Returns must be shipped backwithin 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.

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.

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