The downside of extension tubes is that the focus is manual, quon loses all connections between the goal and the housing and that the more they are, the more light is lost, but it's a known thing not néchappe this product, so I nenlève not detoile here. Ditto for the lack of notice, cétait mentioned in the description.
Tested with the Canon 55-250, the goal holds well, and I can take objects to 10cm from the tip of the goal, against 60-70 minimum without the tubes. The zoom allows the goal to focus manually. As against the depth of field is sooooo small (but this is normal here), about 1-3 mm in my test.
