I try to set flash exposure compensation by altering the film speed manually in my Rebel 2k,but the problem is that the film speed is adjusted in 1/3 steps while EV in 1/2 steps. So, will this be a problem,eg.i set the ISO 100 to 160 and then +0.5EV ? I just wonder if the difference due to 1/3 steps and 1/2 steps is significant in this respect? thanks

-- legnum (legnum212@email.com), May 19, 2002

Answers

Insignificant difference.

-- Jim Strutz (j.strutz@gci.net), May 19, 2002.

Three things will make the 1/6 EV difference in precision insignificant:

1) The meter is only calibrated correct to within 1/2 EV anyway.

2) E-TTL flash particularly with FEL is more accurate than TTL or A-TTL metering.

3) On some EOS models, such as my old , setting the ISO at 1/3 step intervals only results in two steps per EV. So, setting ISO 125 and 160 produced the same result, different from ISO 100 and 200. That might be why you might not see any difference.

However, my Elan 7E seems to treat the 1/3 steps correctly, so you should check your own REBEL 2000 before committing to a shoot.

-- elan7e-owner@yahoogroups.com (JulianLoke@127.0.0.1), May 19, 2002.