# Eyepiece Tele Vue Ethos‑SX 3.7 mm 2"/1.25" — high‑magnification optical eyepiece

**URL:** https://aio.lv/en/product--oem-eth-037--11698697
**Data updated:** 2026-02-25 16:42 (EET)
**Category:** Telescopes
**Manufacturer:** OEM
**Manufacturer code:** ETH-03/7
**EAN:** 0759270088880
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 857.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 708.67 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--oem-eth-037--11698697

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 25.06.2026 | free |
| Pickup points | 30.06.2026 | 1.99 EUR |
| Courier delivery to door | 30.06.2026 | 4.99 EUR |

## Summary description

Tele Vue Ethos‑SX 3.7 mm 2"/1.25" eyepiece is a high‑magnification optical accessory designed for telescopes with 2" and 1.25" focusers. Offering 3.7 mm focal length, it provides strong enlargement for planetary and lunar observing, as well as high‑resolution detail work. Built for professional and serious amateur use, it fits dual‑format focuser housings.

## Long description

The Tele Vue Ethos‑SX 3.7 mm 2"/1.25" is a high‑magnification eyepiece engineered for telescopes with dual‑format 2" and 1.25" focusers. With a 3.7 mm focal length, this optical accessory delivers strong enlargement suited to detailed planetary, lunar and double‑star observation. The design emphasizes sharpness across the field, precise eye relief for comfortable viewing at high power, and compatibility with both 2" and 1.25" eyepiece holders without requiring adapters.
Advantages
The Ethos‑SX 3.7 mm combines a short focal length with a well‑corrected optical layout to provide high contrast and fine resolution at large magnifications. Its mechanical construction is built for repeatable alignment and secure mounting in either 2" or 1.25" focusers. Eye relief and field curvature are managed to offer usable views of small solar system targets and tight double stars, while coatings and glass selection reduce internal reflections and ghosting.
Suitable for
 High‑magnification planetary and lunar observing
 Splitting close double stars and high‑resolution stellar work
 Use in telescopes with 2" or 1.25" focusers that require a compact, powerful eyepiece
 Serious amateur and professional visual observing sessions
Key specifications
 Focal length: 3.7 mm
 Format compatibility: 2" and 1.25" focuser housings (dual‑format mechanical fit)
 High‑power magnification suitable for planetary and lunar detail
 Optimized eye relief for short focal lengths to enable comfortable high‑power viewing
 Multi‑coated optics to reduce reflections and enhance contrast
 Robust mechanical housing for secure mounting and repeatable positioning
How to use
Install the eyepiece into the matching focuser size on your telescope: choose the 2" or 1.25" receptacle that corresponds to your focuser configuration and secure the eyepiece with the focuser's thumbscrews. Begin observing with a steady mount and appropriate magnification for seeing conditions; because the Ethos‑SX 3.7 mm provides high magnification, fine‑tune focus slowly to achieve peak sharpness. For best results, use a stable equatorial or alt‑azimuth mount with tracking and wait for atmospheric steadiness before attempting very high resolution targets.
Usage recommendations
For optimal performance, pair this eyepiece with telescopes that have sufficient aperture and resolution to benefit from a 3.7 mm focal length. Avoid using excessively high magnification under poor seeing; instead, choose nights of steady atmosphere and use precise focuser adjustments. When switching between 2" and 1.25" positions, ensure the eyepiece is clean and the focuser thumbscrews are firmly tightened to maintain alignment and prevent damage.

## FAQ

### How much does the Tele Vue Ethos‑SX 3.7 mm eyepiece cost, and is it available for purchase?

The price is 857.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 25.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can Tele Vue Ethos‑SX 3.7 mm eyepiece be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All OEM products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized OEM service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11698697/67079624_large.webp