The function of the camera and lens is unchanged, and you can combine extension tubes for greater magnification. Canon offers two extension tubes, the EF 12 II and the EF 25 II. Magnification differs by lens, but with the EF12 II and standard zoom lenses, it is approximately 0.3 to 0.5. With the EF 25 II, magnification is 0.7. When combining The 12mm EF 12 II is often used with wide-angle lenses, while the longer EF 25 II is a better choice for normal or telephoto lenses. Auto exposure continues to work reliably, but manual focus is recommended in most instances. The version II extension tubes are also compatible with EF-S 18-55mm f/3.5-5.6. Touch devices users use touch & swipe gestures. Canon Ef 25 Ii Extension Tube Manual, Egroupware Manual 1.6, Motorola Cdm1550 Manual, Privia Px 320 Manual, First Alert Carbon Monoxide Alarm Instruction Manual Co614, Army Manual Court Marshal, 2002 Deville Manual. Canon Ef 25 Ii Extension Tube Manual -. I'm considering getting the 25II extension tube for my 100f/2.8L. Can anyone provide samples or a link that compares results with/without it.. The reviews seem to qualify it as a great accessory but many of them are from users that are converting an existing non-macro lens like the 50f/1.4 which I don't foresee doing. I would not put much weight on reviews of technical gear posted on Amazon. They are all posted by amateurs, making their first purchase of something “nice”, and Customer Reviews. The Kenko Auto Extension Tube Set DG 12mm, 20mm, and 36mm Tubes for Canon EOS AF Mount allows you to focus closer than your lens's normal minimum focusing distance. The set contains three tubes of different lengths, and they are designed without optics. With all the circuitry and mechanical coupling, the extension tubes I am considering getting a Canon EF 25mm II Extension Tube for use with my EF70-300 f4-5.6 IS USM to be able to get a little closer if needed. Sometimes I like to shoot e.g. bees on flowers. Would it be of help for that? Currently my only other lens is the 50mm f1.8 II. Get the best deals for canon extension tube ef at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! EF 12 II Extension Tube is especially suited for close-focusing. Extension tubes work well. Manual focusing is recommended, Compatibility: Made For Canon EOS. Extension Tube Length: 12mm. Top Rated Gear: Canon Auto Focus Extension Tube EF 12 II for Close-up and Macro Photography MFR: 9198A001. Compatibility: Canon EOS, Extension Tube Length: 12mm. I think extension tubes are in the $80 dollar range. But a Canon EF-S 60mm f/2.8 Macro USM Lens will be far more useful because you can use it in 'normal' situations too. Pretty nice to have a constant f2.8 lens that is super sharp. An extension tube has one limited usefulness for $80 bucks! BDhYE.