The Leica viewfinder magnifier M 1.4x is an optical accessory that was specially developed for the Leica M system cameras to make focusing easier and more precise. Here are the key features and a detailed description of the product:

1. **Magnification**: The viewfinder magnifier provides **1.4x magnification**, which increases the viewfinder area. This allows for more precise focusing, especially with manually focused lenses.
   
2. **Compatibility**: It is **compatible with all Leica M cameras** and can be used with the viewfinder of any M camera. It is simply screwed into the camera viewfinder connection.

3. **High optical quality**: The magnifying glass uses **high-quality lenses** from Leica, ensuring excellent image quality without significant distortions or color errors.

4. **Compact size and light weight**: With a **compact design** and a **low weight** of only about 30 grams, the viewfinder magnifier is particularly portable and does not get in the way when taking photos.

5. **Ergonomics**: The magnifying glass can be easily folded in and out of the viewfinder and is comfortable to use. It contributes to **improved ergonomics** by making it easier to focus without cluttering the viewfinder.

6. **Precision when focusing manually**: The viewfinder magnifier shows its strengths particularly with **manual focus lenses** such as those from the Leica M series. It makes it possible to better see details in the image and thus ensures **precise focusing**.

7. **Versatility**: The viewfinder magnifier is also very useful in **low light** as it allows you to see the image in the viewfinder more clearly.

### Application:
The Leica viewfinder magnifier M 1.4x is particularly useful for **photographers** who use manual focusing methods a lot and want more precise focusing. It is ideal for **portrait photography**, **landscape photography** and other applications where depth of field and detail are important.

Overall, the Leica Viewfinder Magnifier M 1.4x is an elegant and practical accessory that enhances image composition and focusing with Leica M cameras has been significantly improved.