CANON EF Extenders increase the power and versatility of existing lenses. EF Extenders work by increasing the distance between the film plane (or CCD) and the rear element of the lens. The extra distance increases the effective focal length of the lens to bring distant subjects closer.
Canon developed these extension tube specifically for use with EF optic to strengthen the close-up capability of the EOS system where Canon first introduced a 25mm tube back in 1987/8. The accessory(ies) are very affordable They transmits electronic signals via the 8 electronic contacts between camera and lens for AF/Metering/Exposure control and others (such as lens status, lens type, metering information, focal length and AF drive information. Except for macro lenses, ordinary lenses have a maximum magnification of around 0.1X. Extension tubes can get closer to the subject and obtain higher magnification. It does not has any optical component inside (hollow) and it is a good tool when attached to standard and wide-angle lenses or for use with telephotos to get just a bit closer to the subject by increasing the closest focusing distance. Mounting the extension tube between camera body and lens lets you take close-up shots easily but some basic functionality of the primary lens will be affected for normal photography at longer distance (yes, it works at close focus range only). There is negligible light loss and TTL meter should be able to compensate that; good thing is, the optical performance of the primary lens in use is not affected - provided the lens performs good at these their respective closest focus distances. Technically, they can be used with almost all EF lenses (except in the instruction for the original Extension Tube 25 it mentioned the accessory is NOT compatible with some EF lenses such as EF 15mm f/2.8 Fisheye; EF 50mm f/1.0L USM and for the 20mm setting of Canon EF 20-35mm f/2.8L - focusing capability is not possible). In principle, with any lens, the longer the extension tube, the greater the close-up effect as it extends the lens-to-film distance by either 12 mm (Extension Tube EF 12 II or 25 (II) (both tubes introduced probably in 2003). The current version is the version II. With both the series, you have a wider choice of extension tubes and close-up magnifications. Auto exposure continues to work reliably, but manual focus is recommended in most instances. Both version II extension tubes (12mm and 25mm) are also compatible with Canon EF-S lenses such as 18-55mm f/3.5-5.6 or others. The magnification differs according to the primary lens attached to any of it but for most standard zoom lenses, it is approx. 0.3~0.5 for the Extension Tube 12 II and 0.7 or larger for the 25mm version II. You can stack and combine both the tubes for higher magnification ratio. The version II extension tubes have a white lens mount index (instead of traditional red marking) to indicate compatibility with the new EF-S lens. As the version II was introduced and expansion of the EF lens group, Canon published some incompatibility of the two tubes with some of the selective EF lenses: -
Extension Tube EF 25 II is NOT compatible with: EF 15mm f/2.8 Fisheye, EF 14mm f/2,8L, USM, EF 20mrn f/2.8 USM, EF 24mrn f/1.4L USM, EF 16-35mm f/2.8L USM, EF 17-40mm f/4L USM, EF 20-35mm f/3.5-4.5 USM, EF 24-70mm f/2.8L USM, EF 28-300mm f/3.5~5.6L IS USM (at its wide angles settings), MP-E65mm f/2.8 1-5x Macro Photo, TS-E 45mm f/2.8, EF-S 10-22mm f/3.5~f/4.5 USM (at its wide angles settings), EF-S 17-85mm f/4-5.6 IS USM (at wide angles), EF-S 18~55mm f/3.5-f/5.6 USM (at wide angles), EF-S 18-55mm f/3.5-5.6 (at wide angles). (Canon also stated they do not recommend use of the Extension Tube EF 25 II with EF-S 10-22mm f/3.5-f/4.5 USM at near the tele-end. since it radically reduces working distance
Extension Tube EF 12 II is NOT compatible with: Canon EF 15mm f/2.8 Fisheye, EF 14mm f/2.8L USM, MP-E 65mm f/2-8 1-5X Macro photo, EF-S 10-22mm f/3.5-f/4.5 USM (at wide angles), EF-S 17-85mm f/4-f/5.6 IS USM (at wide angles).
67.6mm x 27.3mm;
Weight (g): 125g;
accessory: Hard Case: LH-B8;
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