| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6874 |
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Do the tubes have electrical contacts that go through from lens to camera body?
Most ring flashes are not TTL as they cannot or do not pre-flash but work on the principle of using a fixed aperture value. However as soon as you put extension tubes into the equation this changes the notional aperture.
So you need to use a bit of trial and error to work out if the lens shows f8 then the real aperture with the ext. tubes may be f16 or f22 or something else. Do a series of exposures and see which value you need to use for the shown aperture on the lens.
Also remember that most ring flashes are relatively small flashes.
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