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Related Questions and Answers

Q: 1. Is the EF 12 II COMTATBLE FOR A EF 70-300mm f/4-5.6 IS USM?

A: We use this with a tamaron 70-200 EF on a full senor C300 for video. It gives us really nice macro shots - minimizing the focal distance and giving us good close up magnification while still remianing a few feet away from the subject. The increased magnification is significant, but the the depth of field is very shallow and you lose infinite focus.

Q: 2. 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: 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. Is it compatible with third party lenses? For example Tamron or Sigma lenses?

A: I use this often with a Sigma 150-600mm Contemporary Lens to shoot dragonflies and it works fine. As others have mentioned infinity becomes a lot closer. A gent at a local pond was taken aback when I told him I could not take a picture of the snapping turtle on the beaver lodge because it was too far away. I took off the EF 25 II, got the shot of the turtle, put it back on and got back to my dragonfly hunting.

Q: 5. 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: 6. With the canon 50mm macro lens, what is the greatest magnification achievable?

A: I have both the EF 12 II and the EF25II. I tend to be happier with the EF 12 II on my 100mm macro. I think it is a matter of preference for the work at hand. Hope this is of some help. Good Luck, m

Q: 7. Is the Canon EF 25 II Extension tube compatible with all lenses? Specifically, Canon 28-135 IS & Tamron 18-270 VC.

A: Yes, the tubes are compatible with any Canon EOS lenses or lenses made for the Canon EOS system. On wider lenses it is less useful at the wider focals but you can zoom out to the middle/end of the lens and still effectively use them together.

Q: 8. Is the Canon EF 25 II Extension Tube compatible with my Canon 17-55 mm F/2.8 IS USM lens? Will it give me the ability to use auto focus and image stabilization with this extension tube or will I lose that ability?

A: This extension tube has full Auto focus capabilities; that's what all the pins are for they allow communication between your camera and lens. The image stabilization isn't depended on the extension tube. It's set separately on the lens. I am not sure why you want to use an extension tube on a wide-angle lens. Extension Tubes are usually used on telephoto lenses, allowing them to focus closer, and on macro lenses to gain some extra magnification. The whole point of an extension tube is to decrease the minimum focusing distance of a lens, and gain a little more magnification. A wide-angle lens inherently has a close focusing distance already, and normally you are shooting wide, and don't need any magnification, because if 35 mm is close enough, just zoom in to 55 mm. You have both abilities, but there really not usable on your lens. If you had a 600 mm lens, then this extension tube would be a good accessory to have.

Q: 9. 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: 10. will it work on 400 f5.6

A: You could use the EF 25 II on the Canon 400mm f/5.6, though extension tubes will only provide minimal magnification gain with telephoto lenses.