SVBONY SV170 Telescope Eyepiece Zoom Eyepiece 1.25"10mm-30mm FMC 5Element 3Group

Description

Features
:
SVBONY super-wide angle 1.25" zoom eyepiece.
The zoom eyepiece allows you to change magnification power without swapping out eyepieces.
5-Elements / 3-groups made of high index glass deliver sharp, high contrast vistas.
A simple twist of the zoom eyepiece housing changes the focal length from 30mm to 10mm, providing a variety of viewing magnification powers.
Exceptionally long 17mm-18.5mm eye relief range allows eyeglass wearers to enjoy the entire field of view without needing to remove their glasses.
Sleek black barrel with safety undercut to reduce the possibility of the eyepiece slipping out of the focuser or diagonal.
Blackened lens edges, anti-reflection threads for maximum contrast.
Package Includes
SV170 Black 1.25in 10-30mm zoom eyepiece
Two Rubber Dust cover
Mirror Cloth
Model
SV135
SV170
SV171
Focal length
7-21mm
10-30mm
8-24mm
Eye Relief
18mm - 16.3mm
17-18.5mm
18-19.5mm
Zoon Type
Linear
Lens structure
6PCS / 4group
5 -Elements/-3Groups
7-Elements/4-Groups
Interpupillary Dist.
15mm
Barrel Size
1.25"
1.25"
1.25"
Field of view
57° ~ 40°
33°-51°
38°-56°
Coatings
Fully Multi-Coated-Green
Fully Multi-Coated
Fully Multi-Coated
Rubber Eye Guard
Yes
Blackened Lens Edges
Yes
Yes
Barrel Safety Recess
Yes
Yes
Eyecups Meterial
Metal
Metal
Metal
Eyecups
Twist-Up
Twist-Up
Thread Size
M28.5*0.6
M28.5 x 0.6
M28.5 x 0.6
about svbony
HoTech 2" SCA Field Flattener with T-Thread for f/5 - f/8 Refractor Telescope FF582
Description
Ordering Info
USA Shipping
International Orders
Returns
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1. PRODUCT DESCRIPTION
High Quality Optics Designed for Refractor Telescopes!
This field flattener is fully multi-coated on a two-element lens allowing the most efficient light transmission without sacrificing the precious light collected from your telescope. It accommodates f/5 to f/8 refractor telescopes. You will see bright and sharp images across the entire field.
The Field Flattener has built-in standard 2"/48mm (M48-P0.75) female filter thread on the telescope side. On the camera side is a male T-thread (M42x0.75) that accepts all kinds of 35mm cameras (Camera specific 42mm T-ring required for this is not included). Note that this T thread is not the same as the newer 48mm T thread found on a few adapters and accessories.
The flattener's back-focus requirement is 55mm (2.17") from the male T-thread to the CCD chip on your camera. This is to be measured from the shoulder of the flattener (where the male T thread begins). The length of the male T thread is approximately 2.5mm but this will be covered by the T thread spacer or T ring. Many T rings have a thickness of 16mm, of which 5mm will be inserted into the camera body, leaving an effective optical path length of 11mm for the T ring. So, for example, threading a T ring on this flattener will provide a spacing of 16mm from the shoulder of the flattener to the end of the T ring, or 11mm to the camera lens mount. With many of today's SLR cameras, a T ring might provide all the spacing you need with this flattener. T thread spacers are sold separately if you need additional spacing.
The image of Vega below was taken with a Takahashi TSA-102 (f/8) telescope using a Canon SXi DSLR. Stack of 4 x 5 min exposures without sharpening or noise reduction. Note that the enlarged star at the right edge of the photo remains circular.
SCA (Self Centering Adapter) Brings your Camera to the Closest Optical Axis in the Drawtube/Visual back for the Best Imaging Result
To capture great images from your telescope, it is essential to position your camera firmly in and on the optical axis of your drawtube/visual back. The SCA T-Adapter center loads your camera in the drawtube/visual back with the simple threading of a compression ring forcing the built-in rubber rings outward radially, thereby centering the camera in the drawtube/visual back for optimal installation.
SCA Eliminates Drawtube/Visual Back Slop
All drawtube/visual backs have manufacturing tolerances and require a larger diameter to accept various eyepieces and adapters. When the camera adapter is inserted, the gap between the drawtube/visual back and the inserted device creates a slop problem. The rubber rings in the SCA expand radially according to the users own adjustment to fill the gaps. This makes sure that your camera seats firmly in your drawtube/visual back, becoming part of your telescope for a secure and repeatable installation.
SCA Eliminates Unstable Locking from Thumbscrew or Unified Compression Ring
The optical axis is shifted when the inserted device is locked in by the thumbscrew. In some cases, some poorly made unified compression rings can cause unstable tilt when locking in the drawtube due to loose tolerances between the compression ring, inner groove, and the uneven tip of the locking thumbscrew in a drawtube. The SCA T-Adapter fits your camera without using the thumbscrew or the unified compression ring.
SCA Accepts the Imperfection of a Drawtube/Visual Back
Have small imperfections inside the drawtube like dents or scratches?  The rubber rings fill the gaps and faithfully center your camera in the tube. In addition, even if the drawtube is slightly deformed in diameter or egg-shaped, the rubber rings in the SCA will compensate for the difference and faithfully center your camera.
Short SCA Profile Prevents Oscillation
The short profile design keeps the installed camera stable from low frequency oscillation transferred from the telescope in a windy environment. The back focus of the 2" SCA T-Adapter is 19mm (0.75") measured from drawtube shoulder to the bottom T-Thread.
SCA Damps Vibration
The all-around, adjustable tightness, rubber contact dampens unwanted vibrations from the telescope providing you a sturdy attachment on your telescope for stable image capture.
Weight = 5.6oz.
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.
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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 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.
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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