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Does anyone know the max size ext tube you can use with a Canon 5D MkIV with a 100mm Macro?

Started Mar 3, 2020 | Questions thread
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Darkmatterx76
Darkmatterx76 Regular Member • Posts: 174
Does anyone know the max size ext tube you can use with a Canon 5D MkIV with a 100mm Macro?

Hi, does anyone know the max size ext tube you can use with a Canon 5D Mk IV with a 100mm Macro to get as close as possible to the subject and still focus? I've got a cheap set of tubes that I got to try them out and they are 13mm, 21mm, and 31mm.

I was doing snowflakes, and sadly even with the lens pretty much on the glass the snowflake is sitting on, I can't use the 21mm, just the 13mm. The 21mm simply will not focus.

I know different companies have different tube lengths, so I wondered if someone already knew what the max I could use and still get minimum focus.

Thanks!

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Canon EOS 5D Mark IV
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