@aki_hartikainen

Read definition of F stop, please. See my links above.

The cropped sensor needs more amplification for the same brightness.

It is not accurate statement. Bigger sensor from same manufacturer with same resolution collects more light, hence more electrons in each sensor well. Here we assume that exactly same ideal lens is mounted made for FF.

@Vitaliy_Kiselev Sorry, I must have missed it? Thanks for splitting it, though!

Maybe you could make a topic name that makes it more accessible though? As this is a very common misconception. I see people also thinking that a particular mount will make a camera behave differently.. again a different topic but there are so many misconceptions related to this, and many "experts" who do little to make it better, or worse: spread misinformation.

Obviously there are many topics on the matter so if you don´t want to do it - I understand completely.

(on third thought, maybe information on sensor sizes and behavior could be added to the FAQ – end of this topic)

Higher AVERAGE amount? That makes no sense. Higher total, yes - since a larger sensor covers more of the image circle. (the full amount of light that a lens transmits) The last line of your post seems correct, however I object to the conclusion of your first sentence.. (as described above). Obviously, at certain points there might be differences in average light (between different sensor sizes) too (like towards the edge of the image circle there is less light), but these differences would be too small to even take into consideration as a principle in normal circumstances.

@onionbrain

Gentlemen, it's pretty common knowledge at this point that an f/2.8 lens is going to be brighter on a full frame than on an MFT sensor/camera.

You are quite mistaken in your "common knowledge".

@Onionbrain

f2.8 is NOT, I repeat NOT going to be brighter on a full frame than on a any other sensor size. It´s the same. The lens determines how much light that is transmitted to the sensor and a bigger sensor makes no difference in that. It´s just bigger. DOF is a different story, but that wasn´t the question in this case. (an f2.8 will be less shallow on a smaller sensor than on a bigger one)

IF there is a difference in terms of low light performance (between full frame and smaller) it´s because the bigger sensor (if equal to the smaller in constitution) will produce a bigger image, that in turn can be downscaled - which makes grain e.t.c. less apparent. If sensors are equal, images will be of exactly equal brightness at the same F stop. (on the other hand, you will need to stop down the lens more on a full frame to achieve a long DOF in comparison to a smaller sensor - and that can be a clear disadvantage in low light situations.

P.s. if you don´t believe me, ask yourself this: have you ever seen a light meter where you had to specify sensor / image size?

@DealjagdLtd @Kristo_Ketis @John_Farragut

Please, stop this offtopic.

If you have questions then go to http://www.personal-view.com/faqs/camera-usage/general-camera-usage-faq

If this is not enough, google and read for few extra minutes.

Of course, full frame has less noise and more dynamic range, so you can "boost" an underexposed image and still get the same quality as MFT -- I think. But my technical know how about sensors isn't that big. So maybe technically, you could underexpose FF compared to MFT. But in reality, both cameras with same F-Stop, exposure and ISO would still result in same brightness of picture, I believe.

When you have F/2.8 at 35mm-Frame (it's NOT Full-Frame!), and F/2.8 and you exposure both with 1/500 sec. and ISO 200. Then it will be the same Brightness.

@John_Farragut

"Also f/2.8 is the same for MFT as full frame."

No, it's not.

@mpgxsvcd

"F2.8 is a lens specification and not a camera specification. Depth of field depends on the lens and the sensor size. Focal ratio only depends of the lens specifications."

All of which has nothing to do with what I wrote.

Gentlemen, it's pretty common knowledge at this point that an f/2.8 lens is going to be brighter on a full frame than on an MFT sensor/camera. This has nothing to do with my original point -- that offered possible reasons why no one had their mind blown with the video quality of those sample videos posted. If you'd prefer to go with the explanation that those videos sucked because the GH3 sucks -- well -- fine.

@onionbrain You can download the original files via the downloads section. The original -- unaltered -- .mov or or .mp4 container. You have to download it seperately.

Also f/2.8 is the same for MFT as full frame.