No, tubes are not really easy to use :-) First of all you've got less light with them. So you need longer exposure, less F or higher iso. I took this shot at iso400. In sunny day and with lots of luck one can take good picture at iso400, f9-11 and 1/125-1/400. And of course manual focusing. Work is hard and sometimes [well, almost always ;-)] frustratig, but I think pictures like this are worth effords.
Best wishes my friend,
Uninvited Guest (64) *