Canon EOS Macro Extension Tube Set Kit for Extreme Close-up, Fits Canon EOS 1d,1ds,mark Ii, Iii, Iv, 5d, Mark Ii, 7d, 10d, 20d, 30d, 40d, 50d, 60d, Digital Rebel Xt, Xti, Xs, Xsi, T1i, T2i, T3, T3i, 450d, 500d, 550d, 1000d, 1100d

the quality of the extension tube is well enough for my use, did not have any problems with them. They have a lens lock to hold the added lens in place. Works well for macro set ups.

It's confusing at first but I finally figured it out.

It distort the image and lower the quality

Great for the price.

It is fine, but be carefully with it it was stuck to my camera body. After a while I was able to take it off without damage to the camera. I have not shot any photos with it.