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Dean Wilson

Dean Wilson

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Has anyone ever tried Extension Tubes on the RF 24mm F/1.8?

All of my other RF lenses, 15-35mm f/2.8, 24-70mm f/2.8, 70-200mm f/2.8, 100-500mm fit the Meike extension tubes, but not the 24mm f/1.8 MACRO.

In the mean time, I'll be searching the Internet starting with the Meike website.
 
Solution
Bryan Conner
I asked Google Gemini and got the following information:

If you are finding that the Canon RF 24mm f/1.8 Macro IS STM physically will not mount to your Meike RF extension tubes, you aren't alone—this is a known issue caused by a physical mismatch in the mount design of this specific lens.

While the lens and the tubes both use the "RF mount," there are two specific reasons for this physical incompatibility:

1. The Protruding Rear Element "Skirt"​

The RF 24mm f/1.8 Macro has a unique rear design. Unlike many other RF lenses (like the 50mm f/1.8), the 24mm has a rectangular-ish plastic light baffle (shroud) that surrounds the rear glass element and the electronic pins.

  • The Conflict: Many third-party...
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I asked Google Gemini and got the following information:

If you are finding that the Canon RF 24mm f/1.8 Macro IS STM physically will not mount to your Meike RF extension tubes, you aren't alone—this is a known issue caused by a physical mismatch in the mount design of this specific lens.

While the lens and the tubes both use the "RF mount," there are two specific reasons for this physical incompatibility:

1. The Protruding Rear Element "Skirt"​

The RF 24mm f/1.8 Macro has a unique rear design. Unlike many other RF lenses (like the 50mm f/1.8), the 24mm has a rectangular-ish plastic light baffle (shroud) that surrounds the rear glass element and the electronic pins.

  • The Conflict: Many third-party extension tubes, including the Meike MK-RF-AF1, have an internal circular opening or a set of internal baffles that are slightly too narrow to accommodate this specific shroud.
  • The Result: The lens hit a "hard stop" against the internal plastic of the extension tube before the bayonet lugs can fully seat and twist-lock into place.

2. Tight Manufacturing Tolerances​

The Meike tubes are built with aluminum or plastic interiors that are designed to fit the majority of RF lenses. However, the RF 24mm f/1.8 (and sometimes the RF 35mm f/1.8) has a slightly "chunkier" rear geometry because of its macro-optimized design and image stabilization assembly.

  • Because Meike tubes are not "Official Canon" accessories (Canon does not currently make official RF-mount extension tubes), they weren't tested against the specific dimensions of the 24mm Macro during their initial engineering phase.

Which brands actually fit?​

Since Canon does not make official RF extension tubes, you have to rely on third-party brands that have engineered a wider internal clearance. Based on user reports and technical specs:

  • JJC (AET-CRFII): These are currently the most recommended alternative. JJC redesigned their RF tubes (the "II" series) specifically to have a wider internal throat to accommodate the "Macro" primes like your 24mm.
  • Viltrox (DG-EOS R): Most versions of the Viltrox metal mount tubes fit the 24mm, as they use a more open internal design than Meike. However, some users find the fit a bit "loose" compared to JJC.
  • Fotodiox: These are generally considered the high-end option for third-party tubes. They are built with tighter tolerances and almost always clear the rear baffles of the shorter RF primes.

 
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Solution
Thanks @Bryan Conner

It would have been easier if I just looked at the lens. I'm not intentional stupid... I've worked very hard at it.

20260328_144423.jpg
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