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Related Questions and Answers

Q: 1. How is an extension tube different from a 2x converter?

A: A teleconverter increases the size of your image sensor, whereas extension tubes do not and mostly used for macro photography.

Q: 2. Will this EF 25 work well on the Canon 300mm telephoto lens?

A: It will work, but the effectiveness of an extension tube is in direct proportion to the focal length of the lens you are using it with. A 25 mm tube on a 50 mm lens is very dramatic. On a 100 mm lens it is still very noticeable but the magnification is not as extreme as with a shorter lens. I am not sure how much closer you will be able to focus with a 300 mm lens. It will change your minimum distance but I don't know if it will give you what you are looking for. You can also combine extension tubes to get closer focusing on longer lenses.

Q: 3. Can I attach this and than use ef 1.4x + ef 2x extenders combined, mounted on a ef 300mm 2.8?

A: Unfortunately, Canon EF Extenders and Canon Extension tubes cannot be combined.

Q: 4. Does this work well with the canon 24-70mm 2.8 or the 70-200 mm 2.8?

A: All extension tubes are plain metal rings with electronics contact. It works with all lens.

Q: 5. Hi. Will this ring mantain AF as well IS on Canon EF IS lenses?

A: The extension tube maintains all lens functions. Also, exposure is automatic in modes such as AE.

Q: 6. If the purpose of the Canon EF 25 II is to shorten closest focusing distance and the Canon EF 400 f/5.6 L USM's closest focusing distance is 11.5 ft. By adding the EF 25 II to this lens how many feet is the extension tube reducing the focusing distance by?

A: You can Focus anywhere from 6-7' instead of 11.5' (But you lose infinity focus, I would say maximum 20' anything after that full blur) I use it only for control environments...

Q: 7. Will the Canon Extension Tube EF 25 II B&H # CAETEF25Q work with the new Canon 24-70mm lens?

A: The wide end of your lens is shorter than the extension tube. This could be a problem. It should work fine at the mid to longer focal lengths.

Q: 8. Will this help connect an EFS 24mm Lens to a 5D miii body?

A: Yes it will work but for focusing you have to be super close to your subject and the autofocus hunts a lot. If anything I would use this combo for stationary manual macro focusing only.

Q: 9. Will this fit a Canon Rebel T1i with a Sigma 10-20mm?

A: Yes this case would fit that lens and body together without any issues.

Q: 10. Can the EF 12 extension tuube be used to connect a canon 2x extender to a canon 70mm -300mm EF lens?

A: Yes, it is physically possible to install a EF 12 extension tube between a EF 70-300 and a EF 2x extender, thus preventing the rear element of the lens from striking the front element of the extender. It is totally impractical however. The lens will only focus on a narrow range between about 20' and 50' feet, auto focus will not work - not even on my 1Dx - and the view finder is so dark that accurate manual focus is nearly impossible. I did not experiment further, but I would expect the IQ would also be unsatisfactory. Canon has made it clear that this lens is not intended for use with extenders - and they are right.