---
product_id: 661489524
title: "Optical Glass Objective Lens Concave&Convex Lens for DIY Astronomical Telescope 70mm"
brand: "caume"
price: "S$86"
currency: SGD
in_stock: true
category: "Caume"
url: https://www.desertcart.sg/products/661489524-optical-glass-objective-lens-concave-and-convex-lens-for-diy
store_origin: SG
region: Singapore
---

# F7.1 focus ratio for sharp, precise imaging 70mm diameter for crisp celestial views Apochromatic double-separation optics for zero color fringing Optical Glass Objective Lens Concave&Convex Lens for DIY Astronomical Telescope 70mm

**Brand:** caume
**Price:** S$86
**Availability:** ✅ In Stock

## Summary

> 🔭 Unlock the Universe: See Stars Like Never Before!

## Quick Answers

- **What is this?** Optical Glass Objective Lens Concave&Convex Lens for DIY Astronomical Telescope 70mm by caume
- **How much does it cost?** S$86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/661489524-optical-glass-objective-lens-concave-and-convex-lens-for-diy)

## Best For

- caume enthusiasts

## Why This Product

- Trusted caume brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Compatibility:** Perfect for telescope objectives and parallel light pipeline instruments, compatible with Canon EF and Nikon F mounts.
- • **Precision Focused at 500mm:** Optimized 500mm focal length and F7.1 ratio deliver pinpoint accuracy for your DIY astronomical telescope projects.
- • **Crystal-Clear Cosmic Clarity:** Experience ultra-sharp, high-resolution images with apochromatic double-separation lenses that eliminate chromatic aberration.
- • **Tested for Stellar Consistency:** Each lens set is rigorously quality-checked via parallel light pipeline testing for flawless imaging every time.
- • **Built to Last, Built to Perform:** Durable optical glue bonding prevents yellowing and edge peeling, ensuring consistent performance over time.

## Overview

The CAUME TianWen11WYJ03 is a premium 70mm diameter optical glass objective lens featuring an apochromatic double-separation design that ensures high imaging sharpness without chromatic aberration. With a fixed 500mm focal length and F7.1 aperture, it delivers precise, stable focus ideal for DIY astronomical telescopes. Its durable bonding prevents aging issues, and each lens is quality-tested for consistent performance, making it a top choice for serious amateur astronomers and optical instrument builders.

## Description

desertcart.com : Optical Glass Objective Lens Concave&Convex Lens for DIY Astronomical Telescope 70mm : Electronics

## Features

- Model:70mm, Diameter:72mm, Focus:500, Focusratio:F7.1, Film:Blue
- The objective lenses are all equipped with apochromatic double-separation optical structure, and the two-piece apochromatic lenses have better compatibility with the bonded ones, resulting in high imaging sharpness with no worry about the aging of the photosensitive glue in the large-diameter objective lenses that may cause yellowing and edge peeling over time.
- The objective lenses are tested and paired for imaging quality through a parallel light pipeline and dividing plate, ensuring that each set of objective lenses delivers consistent imaging performance.
- High-resolution, low-dispersion objective lenses are the best choice for various applications such as telescope objective lenses and parallel light pipeline production testing instruments.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CMZDRQ66 |
| Best Sellers Rank | #223 in Telescope Eyepieces |
| Brand | CAUME |
| Camera Lens | The CAUME TianWen11WYJ03 is a prime camera lens with a fixed focal length of 70mm and a maximum aperture of F7.1. It features optical image stabilization and is designed with a 72mm diameter and a focus distance of 500mm. The lens is constructed with apochromatic double-separation optical structure, ensuring high imaging sharpness and consistent performance. It is suitable for various applications… |
| Compatible Camera Mount | Canon EF, Nikon F |
| Focal Length Description | 70 mm |
| Focus Type | Fixed Focus |
| Image stabilization | Optical |
| Lens | Telephoto |
| Lens Design | Prime |
| Manufacturer | CAUME |
| Manufacturer Part Number | TianWen11WYJ03 |
| Maximum Aperture | 7.1 f_stop |
| Maximum Focal Length | 7 centimeters |
| Minimum Focal Length | 7 centimeters |
| Model Name | TianWen11WYJ03 |
| Number of Items | 1 |
| Photo Filter Size | 7.2 centimeters |
| Screen Size | 7 centimeters |
| UPC | 764015311444 |
| Zoom Ratio | 1:1 |

## Product Details

- **Brand:** CAUME
- **Compatible Mountings:** Canon EF, Nikon F
- **Focal Length Description:** 70 mm
- **Lens Type:** Telephoto

## Images

![Optical Glass Objective Lens Concave&Convex Lens for DIY Astronomical Telescope 70mm - Image 1](https://m.media-amazon.com/images/I/51PswirEGLL.jpg)

## Available Options

This product comes in different **Size** options.

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**Shop now:** [https://www.desertcart.sg/products/661489524-optical-glass-objective-lens-concave-and-convex-lens-for-diy](https://www.desertcart.sg/products/661489524-optical-glass-objective-lens-concave-and-convex-lens-for-diy)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-15*