Canon: To which side of an lens mount adapter is an extension tube connected?

In practice, apart from the potentially "strange" appearance, it is unlikely that there will be a significant difference between placing an extension tube between the body and the adapter or between the adapter and the lens. However, there are some potential differences:

  • The way the light is reflected and scattered inside the adapter and the tube would be different. One configuration can produce glare, while the other does not. Some adapters have this problem on their own. To fix it, cover the inside of the tube or adapter near the sensor with adhesive tape.

  • Having a smaller tube near the camera (or a larger tube near the lens) can affect the usability of the camera + assembly + lens.

  • Adapters often fit in with some play. It usually does not affect the use of the camera and the lens. However, add multiple adapters and tubes, and the assembly can become unbearably loose. A smaller tube connected near the camera body would exert more force on it (more leverage and a smaller size) than a widening adapter or a larger tube further.

  • One may be more convenient or easier to use when exchanging lenses. Suppose you have an EF lens that you want to use for macro and one that you want to use normally. To change the lenses with an EF tube, you can leave the tube connected to the lens, but with an EF-M tube, you would have to take out the tube Y Exchange lenses

  • The lenses you can wear with each would be different.

  • Prices may be different.

I have several adapters and extension tubes (which can be connected to both sides of the adapter). Most of the time, I would prefer to attach the tube to the lens because it is easier to change the lenses that way. But if I could do it again, I would skip the extension tubes.

If you are open to using manual focus lenses, consider using a fast-priming helical adapter. (Old 50 / 1.8 lenses are quite economical). The helical adapter will allow you to use the lens normally, as well as extend it to work in the foreground, without having to waste time connecting and disconnecting additional tubes.

Canon: extension tube combination with adapter

You really don't say it, but it seems you have an EF lens and an EOS M camera?

They have different diameters, so is there a difference if I place it between the lens and the adapter or between the adapter and the camera?

You can do any.

You can use EF-M extension tubes with the smaller diameter mounting between the camera and the adapter.

You can use EF extension tubes with the largest diameter mount between the adapter and the EF lens.

What you decide probably won't make much difference.

What will make a difference is if the tubes have the appropriate electrical connections to allow the cameras and the lens to communicate. You probably want to be sure and get extension tubes with the appropriate camera-to-lens connections. Third-party manufacturers often call these extension tubes "automatic."

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Macro extension tube sizes – Photo stack exchange

I have been researching the extension tubes for macro photography and I cannot understand how the length of the extension tube will work, combined with the real lens (say the standard 18mm-55mm).

I may not be able to explain this perfectly (since I am confused about it), but stay with me …

Basically, if you have the normal lens set at 18mm and add a 21mm extension tube. What effect does this have?

I realize that there is a point where the camera cannot focus if it combines an extension tube of length x with the normal lens of length x. Can anyone summarize this?

I apologize if this seems like a simple question and I have read it enough, but I am still confused about this part.

Any help appreciated.

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Can the MTO-11 mirror lens be extended to 2000 mm with an extension tube?

In this link
https://www.dyxum.com/dforum/ayone-knows-the-mc-mto11ca-10-1000-telephoto-lens_topic12136.html
A poster states that the 1000 mm mto-11 can be extended to 2000 mm by removing a stop and adding a 100 mm extension tube.

Is this true for any variant of this lens or does the poster confuse an extension tube with a teleconverter?