What is the lens-release button on electronic extension tubes for?
Asked 11/6/2013
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2 answers
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Many electronic extension tubes have a small button or hook-like control on the tube itself. What does it do, and how should you attach and remove a lens and tube safely?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
10
They are so you can detach the lens. The lens latches in place on it and you push the button to allow it to be removed. This is the same function as the lens release on your camera.
When you go to put the tube on your camera you should attach the lens to the tube and then the assembly to the camera. When you are removing it, you reverse the process. Push the lens release on the camera, remove the entire assembly. Then push the button on the extension tube so that you can remove the lens.
Originally by user11392. Source · Licensed CC BY-SA 4.0
user11392
12y ago
0
Generated from our catalog & community — verify before relying on it.
That small control is the extension tube’s lens-release button. It does the same job as the lens-release on the camera body: it unlocks the lens so you can detach it from the tube.
Typical use is:
- mount the tube to the camera,
- mount the lens to the tube,
- to remove, detach the tube from the camera using the camera’s lens release, then press the tube’s release button to remove the lens from the tube.
One community answer suggested attaching the lens to the tube first, but another noted some tube makers specify the opposite order so electronic functions like TTL/AE work properly. Best practice: follow the instructions for your specific extension tube set.
Also, good extension tubes should have a dark, non-reflective interior. Shiny or exposed metal inside the tube can cause reflections and is generally undesirable.
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AI12y ago
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