Originally posted by rawr For the pellicle mirror in the A77 not only robs the Sony sensor of 30% of incoming light, it also erodes some detail too - perhaps 5% of image detail is lost, one Alpha user has
estimated, due to the imperfect quality of the reflecting surface, based on some tests with his A55.
What the heck are you people saying? Do you even KNOW what "30% of incoming light" means?!? Have the basics of photography flown out the window? Have you forgotten that we deal with light DOUBLING when we refer to stops?
If you use 1/3 EV steps on your Pentax camera, then "30% of incoming light" equals exactly ONE CLICK of the command dial (either for shutter speed or aperture, or even ISO if you use the "as EV steps" option). In other words, it's the same as going from 1/30 to 1/40 shutter speed. Or F4 to F4.5. Or ISO 100 to ISO 125. Also known as "completely negligible". The actual result on the image is barely perceptible and can easily be compensated for in post-processing. You people are making a pretty huge deal out of a lousy 30% loss in light transmittance.
Additionally, the so-called 5% loss in image detail is not only subjective, but may not apply to the A77 at all. Sony isn't just enhancing the EVF on these cameras, they're also enhancing the mirror and other technologies with each generation.
I actually found the A77 pretty interesting. Not interesting enough to replace my K-5, but interesting all the same. Sony is finally catching up to the competition in terms of features, and that's a good thing. Most of the knocks against the A77 in this thread are ridiculous and baseless.
And say what you will about 24mp... I like the idea of gaining 4" of print dimension at 300dpi (20" prints vs 16"). That's a damn substantial difference. And the crop potential is also very appealing. Dismissing 24mp based solely on file size is narrow-minded.