Canon EF 50mm f/2.5 Compact Macro Puzzle

I am looking for a used copy of this lens to scan my 35mm slides and negatives.

The lens picture and videos clearly show this lens with barrel extended up to 1:1 magnification.

In my book 1:1 magnification is real size (meaning I can fill my R5 sensor with a 35mm negative)

This seller says the lens doesn't achieve 1:1 magnification. A Youtuber says the same thing.

So, why does this lens shows 1:1 magnification on the barrel?

Thanks in advance

Edu

Further research here and else, answered my question.

Simple as this lens was designed to be matched with Canon Life size Converter.

This lens is almost prehistoric!

Best

Edymagno wrote:

Further research here and else, answered my question.

Simple as this lens was designed to be matched with Canon Life size Converter.

This lens is almost prehistoric!

Best

It's definitely from a bygone age, but it's still a surprisingly good lens. I had one for a while and though its bokeh was not the best I found it to be trustworthy, with accurate and consistent AF and of course good sharpness.

GammyKnee wrote:

Edymagno wrote:

Further research here and else, answered my question.

Simple as this lens was designed to be matched with Canon Life size Converter.

This lens is almost prehistoric!

Best

It's definitely from a bygone age, but it's still a surprisingly good lens. I had one for a while and though its bokeh was not the best I found it to be trustworthy, with accurate and consistent AF and of course good sharpness.

I found a very well kept used EF USM 100 Macro and went for it. I could use it too as a portrait lens and despite not an RF, I expect it to feel more contemporary and better matched to the R5. Paid only a third of the price of a new current EF 100 Macro L.

Best