Hi Tom,
I have the 990 and TC-E3, it is a very good lens and I often use it
hand held, but in lower light it can be better with a tripod
(although I have shot hand held at 1/30 second and it has come out
fine).
The TC-E2 is more compact but has a lot less zoom.
Incorrect. Set the lens converter option to each and you can read
the wide point in the playback data overlays.
The E2 covers more of the camera's zoom span than the E3 does. The
E2 is useful over the camera zoom range of 14.1 to 31 mm. The E3 is
useful over the camera zoom range of 19.6 to 31 mm. Similarly
shortened zoom range is found on the 990 where the E3 is useful
from 17.5 to 22.4 mm and the E2 from 13.0 to 22.4. The E2 always
gives you more zoom.
-iNova
If you have the 995 you may find the TC-E2 more versatile because
of the 995's 4x zoom, the TC-E2 gives you about the same zoom level
as the 990 with the TC-E3.
If you have the 990 and want the highest zoom get the TC-E3, or you
could get both... this would be the ideal solution but it does cost
a bit.
Yours sincerely,
Michael Offe,
South Australia.