The lens manual gives data for the use of the two Canon extension tubes. With the EF 12 II extension tube (12.3 mm), the maximum magnification at "105 mm" is stated as 0.40. With the EF 25 II extension tube (27.3 mm), the maximum magnification at "105 mm" is stated at 0.61.
This 12mm extension tube fits between camera body and the lens, providing a brighter image that the Extension Tube EF 25 II. Compact and portable- a great accessory to take when shooting wildlife. Maintains electronic contact between lens and body. £ 83.99.
It happens 100% of the time if I attach my Extension Tube EF 12 II to the 600mm + TC. If I half press the shutter, it calms down and I can continue shooting but it does flare up periodically. 0
Canon Lens Mount Adapter EF-EOS M with Removable Tripod Mount. Small, lightweight adaptor for EOS M range of cameras. Removable tripod mount. Compatible with all EF and EF-S lenses. £ 139.99. Eligible for free delivery. Add to basket. Add to wishlist.

With its ability to focus life-size images onto the image sensor, the EF-S 60mm f/2.8 Macro USM offers true macro performance in the EF-S lens series. Having an effective focal length of approximately 96mm in 35mm format, it produces breathtaking close-up results. A minimum focusing distance of just 20cm gets you super close to your subject

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canon extension tube ef 12 ii vs 25