Hi Miha,
> I've been using Kenko extension tubes ans received underexposed slides. Now, I >thought that TTL > will take care of everything -- well, I was wrong. > > I found (Kenko site) that I should've used exposure compenstaion and there are >stated exposure > factors. But what do they mean? > > For 20 mm ext. tube its. 2.0. Does this mean 2 f stops? And for 56 mm it is 4.5 - >5.0, depending > on the focusing distance. Does this mean 4 to 5 f stops? > Which EOS camera 'r you using? I have the same set of tubes and I don't find any exposure problem with my 50E or 30 (ELAN 7E) for 'normal' setups. I even have the 25mm that is sold appart and few times I've used 20+25+36 mm extension with good exposure results (composition is something else :-) You may find troubles with E-TTL though. Underexposure could have been caused by a white/light subject instead. At close ranges, there 18% average scene is just a fairy tale. You have to take subject tonality into account and compensate accordingly. Which lens where you using (just for the sake of curiosity)...? Greetings, Gerard. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
