Originally posted by clackers Because of logarithms, 1/2eV *is* 30%.
you think that i haven't seen that already? it's been argued ad nauseam on the sony forums for years now... that "30%" is a drama queen number
from a dpr article about a *first-gen slt camera that's over 4 years old*
fact is, the lea4 photo comparisons that people have made don't typically show any more than 1/3ev loss, which is insignificant.
judge the lea4 p.q. for yourself here:
Sony LA-EA4 Review | PhillipReeve.net
"Advantages of a pellicle mirror:
The user has an uninterrupted view through the viewfinder while making an exposure.
There is no vibration from mirror movement, reducing shake and audible noise.
Shutter lag may be diminished, and pictures taken at a faster rate, compared to systems employing a reflex mirror.
Continuous phase-detection autofocus during video, live view or continuous shooting mode.
Disadvantages of a pellicle mirror:
The pellicle mirror causes a 1/3-stop loss of light. (Some light is redirected to the viewfinder.)
The mirror has to be kept perfectly clean, or the light sensor and other electronics (as well as the image quality) will suffer.
Owing to its thinness, the pellicle mirror is rather fragile. This makes it difficult to clean."
Pellicle mirror - Wikipedia, the free encyclopedia
some of that might not apply to an lea4 situation, but you get the idea.