If you want to use a Canon 50mm f/1.8 lens for macro photography you might be interested in using a macro reverse ring (sometimes called a reverse lens adapter).
In this post we describe how to find out what size reverse ring you need and give you examples what you can use for your Canon 50mm lens.
First you need to know what thread diameter size the lens has and this depends on the specific lens you are using.
What Thread Diameter Size Is The Canon 50mm f/1.8?
The lens diameter depends on which particular Canon 50mm f/1.8 lens you are using.
Check out my post on the differences between the Canon EF 50mm f/1.8 STM and the Canon EF 50mm f/1.8 II.
This is also known as the filter size too because any filters that you attach to your lens must match this thread size.
Keeping this in mind your reverse ring has to match the lens diameter of the lens you are using.
If you’re not sure which lens you have, you can always check the lens diameter by looking for the lens diameter symbol on your lens.
💡 Look for the symbol on the lens that looks like a circle with a diagonal line through it. It looks like this Ø.
For example, if you see Ø52 then that means the lens diameter is 52mm.
Which Reverse Ring Do I Use For My Canon 50mm f/1.8?
So for the Canon 50mm f/1.8 and Canon 50mm f/1.8 II you need a reverse ring with a diameter size of 52mm.
The following reverse ring is for a 52mm lens diameter:
For the Canon 50mm f/1.8 STM you need a reverse ring with a diameter size of 49mm.
The following reverse ring is for a 49mm lens diameter:
The video below is an in-depth guide on macro reverse rings and the pitfalls that you need to be aware of.
You should definitely watch it before you go and buy any macro reverse rings.
If you have the Canon 50mm f/1.8 STM then you should check out how to find the sweet spot on the Canon 50mm f/1.8 STM.