Interesting, I've grabbed the info from Canon's UK site : Magnification - Extension Tube EF12 II 0.6-0.05 Magnification - Extension Tube EF25 II 0.47-0.11. But actually trying it, I get : Frame width, no tube, 250mm, min focus : 64mm = 0.34x Frame width, 13mm tube, 250mm, min focus : 52mm = 0.42x You can get 12mm, 20mm, and 36mm tubes to go with Canon EF, Nikon F, and Sony A mounts (the Sony A also fits Minolta Maxxum). And 10mm and 16mm tubes are available for Micro Four Thirds and Sony E mounts. The fit of these tubes may vary depending on your lens, but electronic elements like autofocus should work the same. 2. Canon EF 25mm II Canon Extension Tube EF 25 II (USED) $59.99. Add to Cart. Canon EF12 II Extension Tube. $84.99. Add to Cart. Canon EF 25 II Extension Tube Write a Review. Hi everyone! I'm wondering if anyone has experience using a macro extension tube on a superzoom? I have a Canon 18-200 and I was thinking about buying the Canon 25mm extension tube to increase macro performance on that lens (or my Sigma 50/1.4), however I spoke to a (somewhat absentminded) lady at the local photography store about the idea of putting an extension tube on a superzoom and she However, I was thinking of getting a second EF-25 at a later stage and with 50mm lens, I would be able to have 1:1 magnification. (This was my theory of producing a cheap macro lens for a beginner like me). With combining the kenko different sizes, I wouldn't be able to produce a 1:1 macro, unless I get a second set of kenko tubes, or would I? Using Two Extenders together with an Extension Tube (12mm) between them to allow mounting together.. Additional: All three devices (Lens Adapter, Extension Tubes, Extender Lenses) have gold coated electronic contacts for Autofocus control and EXIF data retention.--Regards, Marco Nero. VILTROX EF-EOS M2 Lens Adapter 0.71x Speed Booster for Canon EF Lens to EOS EF-M Mirrorless Camera. $156.00. VILTROX EF-EOS M Lens Mount Auto Focus Adapter - for Canon EOS (EF/EF-S) D/SLR Lens to Canon EOS M. $40.99. Viltrox L-mount Macro Extension Tube Ring Match with Panasonic Leica Sigma L-mount Cameras. $54.00. Re: Extension Tubes on 100mm 2.8 L macro. In reply to quadrox • Apr 27, 2011. Adding a set of 25mm + 12mm tubes will get the magnification to about 1.6x. That's not a large magnification increase, but it may match the framing of the subject to the sensor better, which is important to get more pixels on the subject. Regards, Bill. .

canon ef 25 ii extension tube review