Good solution for macro photography

Have the intermediate rings get yesterday and tried out the evening right at my garden flowers with a Tamron 70-300.
My first conclusion:
Good is the combinability of the individual rings, thereby to get quite a hike closer to the subject, or. it is larger on the sensor abgebildet.Man however be reckoned by the lengthening of the tube lens with slightly weaker light and it is
at full focal length (all three rings) but is also available with tripod already quite shaky with no wind and with remote control / Self-timer completely Ok.Die processing of the Rings is after my first test to judgments very good, all data on the camera (Nikon D90) transmitted and also the autofocus is not working very effectively but what is in the near and macro photography anyway not important.
It would be nice even a small bag for storing been.
All in all I would say for the price a very good compromise and a real macro lens.
Update:
With a 50mm fixed focal length you can achieve amazing results.