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This review is from: MACRO EXTENSION TUBES FULL Set Adaptor fits NIKON DSLR SLR 40X D40 D80 D90 D800 D300 D700,D3200 D3100 D5000 D5100 D7000 D7100, D1,D2,D3 DSLR. (Electronics)
This product is very well made, considering the price. It didn't come with instructions, but then again it doesn't really require any. Screw on to your camera, screw on the required length of tube, then screw on the lens. To separate the lens from the tubes, simply push the screw head back towards the camera - you will hear a click, you will then be able to unscrew your lens.
As there are no connections through the tube, aperture and focus has to be set manually. Focus can be achieved with either zooming the lens, or turning the focus ring. Aperture on the other hand (as far as I know) has to be set manually on the lens. I achieved this by manually holding the aperture arm in place at fully open. this can be found on the back of your lens.
Using extension tubes will reduce the amount of light coming into the camera, so it's best to use a tripod, a long exposure, and adequate lighting. Having the aperture set to fully open is good, but your depth of field is reduced. This is all to be expected however.
Overall a very good product, does what it says on the tin!