Sounds to me like you are just making up excuses to- i don't know- justify the cost of buying an actual macro lens?
artyH wrote in post #18491760
you have to experiment with them to find out what lens and tube combo gives you the best results.
You kind of need to experiment with lenses no matter what you are shooting.
artyH wrote in post #18491760
I find that they work best with shorter lenses if you want lots of magnification.
Well yes.
artyH wrote in post #18491760
If you don't have enough working distance for the needed magnification, you can have a lighting problem.
You can have this problem with a dedicated macro lens too.
artyH wrote in post #18491760
It is easy to get the necessary working distance with macro lenses - you just use a longer one if you need more working distance and lots more magnification.
Sure its easy to just buy a second macro lens and carry around a 100L and a 180L to get more working distance than what you normally need but the OP is trying to down size how much he has to carry around.
artyH wrote in post #18491760
If you aren't careful popping a lens onto a set of tubes, you can drop your lens.
I have news for you, you can drop a dedicated macro lens too. Still need to be careful and I don't really see how tubes complicate this. Camera around neck on strap. Put tubes on the 85 prime with both hands, swap from 24-70 or whatever lens is on camera to tube and 85 lens just like any other lens change.
If you buy the cheap plastic $10 amazon POS options, this might be true, but the Fotodiox tubes I have and the Kenko's still AF
artyH wrote in post #18491760
You also need to be sure that the set of tubes you get is compatible with your camera system, if you want to have TTL exposures that are on.
The tubes are just electrical contacts passing through the lens signal to camera and visa versa. If you have the same lens mount and are not trying to use Nikon lenses on Canon via some weird tube thing, this is not an issue.
artyH wrote in post #18491760
It is convenient to be able to shoot quickly with a flash and a macro lens when this is wanted, even with manual settings on the flash.
Using a tube system is exactly the same.
All these excuses and the one valid one about using tubes you didn't even mention and that is the loss of infinity focusing. With a dedicated macro lens, you could be taking a close up of the ring and see the flower girl off at a slight distance doing something cute. With the dedicated macro lens, you could quickly snap off a cute portrait of her without having to remove the tubes.
Tubes are just a tool and can even get you larger than 1:1 with the right lens so they can do what no other Canon macro lens can do there aside from the MPE65 which is way less practical than throwing tubes on a 50m prime.