horshack

At the individual pixel level they do. But pixel-level metrics aren't relevant since images are rendered by area irrespective of the number of pixels that area contains. On a per-area basis the best technology high MP sensor (D800/A7r) has the same or better quantum efficiency as the best technology lower MP sensor (A7s/D4/D4s/Df/D3s/1DX), and have better base ISO dynamic range.

Larger pixels are not more sensitive to light - the A7s's sensitivity ("quantum efficiency") is about equal to that of the D800/A7 - this is why midtone noise on the A7s is the same as the D800/A7r when compared on a per-area basis (via downsampling). What larger pixels do provide, at least with current technology limits, is better Higher ISO dynamic range, which is due to the total lower cumulative read noise from fewer pixels having to be read over the same area vs a higher MP sensor. This translates to lower noise in the shadows. This larger pixel advantage turns into a disadvantage at base ISO because of the read noise penalty from holding a larger charge (full-well capacity). You can read more details at my dpreview thread here: http://***URL removed***/forums/post/53860364

Someone who had an early copy of the A7s posted a video to youtube showing no resolution loss in crop mode. That video has since been pulled but it was pretty convincing. In the meantime here's another video showing the relative noise between FF and crop mode - looks about the expected 1.x stops:

Perhaps, but the rolling shutter on both the GH4 and A7s look pretty bad to me:

The A7s footage can be made to look more real by by selectively crushing some of the blacks while leaving the areas needing/wanting High ISO illumination intact.

The 5DM2 line skips so not sure a full-scan comparison to the A7s is relveant. The 5DM3 is faster still, yet its video is gooey soft like undercooked chocolate chip cookies.

Still not following your color comments. Professional video is almost always color graded so why would the out-of-box color defaults have significance here for this class of product? And low metarism is significant for reproducing correct colors in differentrs specta of light. As for the video NR, again the rendered JPEGs from A7s raws posted are as clean as the A7svideos that have been posted thus far.

Not sure what you mean by Canon's color science - Canon sensors are some of the worse in terms of metamersim and color selectivity. Also not sure what you mean by a "trick" specific to video - the DxoMark A7s results measured stills performance and demonstrate a 1.7EV improvement in High ISO DR/shadow noise over the current best FF sensor on the market at ISO 102,400. This is exhibited in the High ISO A7s raws posted earlier in this thread.

Here's an ISO 12,800 from an A7s raw with the same dimensions as that screen shot. This one doesn't have crushed blacks, luminance NR or lots of compression and looks very clean to my eyes:

It's just bad JPEG processing. A dpreview user posted A7s raws today (http://***URL removed***/forums/post/53852362). I processed the ISO 12,800 through 408,9600 raws in Iridient and posted the JPEGs here: http://***URL removed***/forums/post/53855688

As for the sample A7s JPEG, that's how ISO 12,800 looks on todays' best High ISO FF cameras (D4s/Df/1DX) for shadows just above clipping when no chroma or lumna noise reduction has been applied.

Both the A7s and GH4 likely have the same/simiilar quantum efficiency, and the A7s likely has a High ISO read noise/DR advantage. Based on this and scaled to their respective sensor size differences the A7s will hold a 2EV noise advantage over the GH4 in stills, and this advantage should apply to video as well since both cameras sample the entire sensor. Subjective differences will come down to only how noise and detail are balanced by their respective noise reduction algorithims.

There are post-processing challenges but the results are worth it the effort. Here are some of my images with an A7R + Noctilux, all at f/0.95: Train Restaurant Kitchen #1 Restaurant Kitchen #2 Piano Player Apple Store Bokeh Globe Eye Contact Buffalo Chihuly Escalator Sporting Goods Candle

Great article, thanks. Since the Leica is revered for its bokeh would love to see more comparisons of that apsect, with varying background/foreground content, subject distances, and apertures.

No focus peaking = dealbreaker for me. Once you've used peaking it's hard to go without. Hope the GH3 winds up having it.

Why didn't the dude call her back after missing the call? He didn't even have to dial - just go to "missed calls" and bam, she's on the line and he saves $75 in gas and tolls. And he gets to stay in the motel and watch I Love Lucy reruns in his underwear. Maybe she's the type who doesn't like people not answering her calls and so he figured she wouldn't answer? I need to buy the book to learn the backstory. lol.