The Canon EOS R100 is quite versatile when it comes to lens compatibility. It uses Canon’s RF mount, which means it can work with both RF-S lenses (designed for APS-C sensors) and RF lenses (designed for full-frame sensors). Additionally, you can use EF and EF-S lenses with the optional Mount Adapter EF-EOS. 

However, it’s important to note that the EOS R100 does not support EF-M lenses. This flexibility allows you to choose from a wide range of lenses to suit various photography needs, from wide-angle to telephoto. Is there a specific type of photography you’re interested in? I can suggest some lenses that might be perfect for you! Using EF lenses with an adapter on the Canon EOS R100 does come with some limitations. 

Autofocus Performance, While the autofocus generally works well, it may not be as fast or accurate as with native RF lenses, especially with older EF lenses. Image Stabilization, Some EF lenses may not fully support the advanced image stabilization features of the EOS R100, potentially leading to less effective stabilization. 

Functionality Loss, Depending on the adapter and lens combination, you might lose certain functionalities like auto-exposure or advanced autofocus Quality, There can be a slight degradation in image quality due to the added distance between the lens and the sensor, although this is usually minimal with high-quality adapters. 

Weight and Balance, Using an adapter adds extra weight and can affect the balance of the camera setup, making it less comfortable to handle, especially for extended periods. Despite these limitations, using an adapter is a great way to extend the usability of your existing EF lenses with the EOS R100. 

If you have specific lenses in mind, I can provide more detailed information on their performance with the adapter. These adapters provide a great way to extend the usability of your existing EF lenses with Canon’s mirrorless cameras. Do you have a specific lens or type of photography in mind? I can help you choose the best adapter for your needs!

There are several third-party adapters available for using EF lenses on Canon mirrorless cameras. Here are some popular options. Viltrox EF-EOS R Adapter, This adapter supports full autofocus and image stabilization, making it a reliable choice for most EF lenses.