default wrote:

The price is similiar both ways.

Depends on what lens is in front of the tube. Some work great, some not so
great.

What are the trade-offs?

It depends on which diopter. The really good 2 element diopters can work
really good and you don't lose light like you do with a tube. Also a zoom
can be used to control image magnification with a diopter which is nice.
They seem to work well with tele lenses which gives you more camera to
subject distance.

Can you take your camera and lens to a store and try both out and buy which
works best (that's what I did)? If you're trying to "shop on line" to save
money, hard to say which would produce better results for your use.


--

Stacey