# Eyepiece GSO Plossl 40mm 1.25" – astronomical eyepiece, 40 mm focal length, 1.25-inch barrel

**URL:** https://aio.lv/en/product--oem-gsp40--11391538
**Data updated:** 2026-03-20 09:48 (EET)
**Category:** Glasses
**Manufacturer:** OEM
**Manufacturer code:** GSP40
**EAN:** 5901691606746
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 40.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 33.46 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--oem-gsp40--11391538

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 26.06.2026 | free |
| Pickup points | 01.07.2026 | 1.99 EUR |
| Courier delivery to door | 01.07.2026 | 4.99 EUR |

## Summary description

GSO Plossl 40mm 1.25" eyepiece is an astronomical eyepiece with a 40 mm focal length and a standard 1.25‑inch barrel. Designed for visual observation, it provides low magnification and wide true field on telescopes compatible with 1.25" eyepieces. Suitable for deep‑sky and wide‑field planetary views, it is used for comfortable, low‑power observing sessions and star hopping.

## Long description

The GSO Plossl 40mm 1.25" eyepiece is an astronomical eyepiece with a 40 mm focal length and a standard 1.25-inch barrel, intended for visual observation with telescopes that accept 1.25" oculars. Engineered to deliver low magnification and a wide true field of view, this eyepiece helps with comfortable, low-power observing sessions, wide-field views of star fields, open clusters and large deep-sky objects, as well as initial planetary framing and star hopping.
Advantages
This 40 mm Plossl provides a large apparent and true field at low magnification while maintaining good edge performance typical for Plossl designs. The 1.25-inch barrel ensures compatibility with a wide range of amateur telescopes and the longer focal length reduces eye strain during extended observing. The eyepiece construction balances field size and contrast to make wide-field observation practical without complex optical accessories.
Suitable for
 Wide-field visual observation of star fields and large deep-sky objects
 Low-power surveys and star hopping to locate targets
 Comfortable, extended observing sessions with minimal eye fatigue
 Initial framing of planets and large lunar features
Key specifications
 Focal length: 40 mm
 Barrel diameter: 1.25 inches
 Optical design: Plossl-style eyepiece
 Intended use: visual astronomy, low-power wide-field viewing
How to use
Insert the eyepiece into the 1.25" focuser or diagonal of a compatible telescope and secure it with the focuser thumbscrew. Begin observing at low magnification to scan large areas of sky; adjust focus slowly until the image is sharp. For improved comfort, set your eye position to match the eyepiece's eye relief and use a comfortable observing posture. When changing magnification, remove or replace this eyepiece with shorter focal length oculars as needed.
Usage recommendations
Use the eyepiece in telescopes with focal ratios of approximately f/5 and slower for best full-field performance; in faster systems, vignetting or edge distortion can increase. Combine with a stable mount and appropriate finder scope for efficient star hopping. Clean lenses only with appropriate optical cleaning tools and store the eyepiece in a protective case when not in use.

## FAQ

### How much does the Eyepiece GSO Plossl 40mm 1.25" cost, and is it available for purchase?

The price is 40.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 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 26.06.2026 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. All transactions are 100% secure and encrypted.

### 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/11391538/66032448_large.webp