Matt Grum wrote:
Yeah that is odd. When I read that I assumed it was something to do with enabling 4K APS-C readout without line skipping, but a quick napkin calculation reveals you only need 25 megapixels to do that...
The 7974px wide is basically double the pixels of 4k, it may have to do with multiples of 4k to get better downsampling when shooting FF.
Answering my own question on what's a backlit sensor
Back-illuminated CMOS
A backlit - or back-illuminated - CMOS sensor is different from a regular CMOS sensor, in that all the wiring and circuitry that's used to carry the electronic signals from each photosite or pixel is located at the back of the sensor instead of the front.
The photosites on most sensors consist of a micro lens, then some wiring, and behind that the photosites that record the light falling on the sensor. By removing the wiring and circuitry from the area between the lens and the photosite, far more light is able to reach the photosites, and this in turn means the image being captured needs far less amplification.
In practice, the design of a backlit CMOS sensor means that cameras fitted with them can record images in lower light levels and with much less digital noise.
r.gil wrote:
Answering my own question on what's a backlit sensor
Back-illuminated CMOS
A backlit - or back-illuminated - CMOS sensor is different from a regular CMOS sensor, in that all the wiring and circuitry that's used to carry the electronic signals from each photosite or pixel is located at the back of the sensor instead of the front.
The photosites on most sensors consist of a micro lens, then some wiring, and behind that the photosites that record the light falling on the sensor. By removing the wiring and circuitry from the area between the lens and the photosite, far more light is able to reach the photosites, and this in turn means the image being captured needs far less amplification.
In practice, the design of a backlit CMOS sensor means that cameras fitted with them can record images in lower light levels and with much less digital noise....Show more →
It also spreads the light more evenly into the corners of the sensor which is a issue with wide angle Leica M lenses. This could be very significant if I am reading into this correctly
So, why no base iso 12 ? :-)
Anyway, wow ! Sony really put sensor development ahead...
what do you think about backlit sensor for DR and color accuracy at low ISO ? Could it be even better (in real world, not for numbers) ?
GMPhotography wrote:
It also spreads the light more evenly into the corners of the sensor which is a issue with wide angle Leica M lenses. This could be very significant if I am reading into this correctly
I agree, this could be a positive aspect especially for wider M rangefinder lenses. Here I am very curious to read more about and see reviews/tests! THIS could then move me to consider the A7R II if it is a clear improvement here.
retrofocus wrote:
Time to wait now a few months to read reviews and experience especially with third party lenses on this camera/sensor. I am especially curious if the function of rangefinder lenses improved with this sensor or if it remains unchanged.
In one of the interviews about NX1, a Samsung executive mentioned that BSI sensors reduce the pixel height to only 1/3rd and thus reduce the issues faced by digital sensors on their edges and reduce the need for a telecentric lens design. So A7rII might provide some benefits in this regard.
ajamils wrote:
But wouldn't this work only in crop mode, as these adapters were designed for APS-C sensor coverage.
No. LA-EA3 is full frame. LA-EA2 and LA-EA1 are APS-C with and without SLT mirror respectively. Similarly LA-EA4 and LA-EA3 are full frame again with and without SLT mirror respectively.
for me its perfect timing.