Correct , the Nikon Z9 and Z8 have the exact same 45mp stacked BSI sensors , as do the Canon R3 (24mp), Sony A9, A9II (24mp) , A1(50mp) , Sony RX10 IV (24mp) also all have stacked BSI CMOS sensors.

Larry couldn't refute all the evidence against his ridiculous "stacked sensors are not BSI sensors" in another long thread on the new Nikon Z8 with its stacked BSI CMOS sensor (the same sensor as in the Nikon Z9) , so Larry created his own new thread here to spread more of his technical inaccuracies and misinformation.

Larry you are still wrong, even if you create your own thread to spread fake information. You cant run and hide from the facts of stacked BSI CMOS sensors, by creating your own separate thread , LOL

Larry thinks sensors have to be either stacked or BSI. Larry tried to sell that falsehood in the Nikon Z8 stacked sensor thread, and nobody was buying that . Larry has no real understanding of the tech and the construction of BSI stacked sensors, even when he sees the illustrations and is presented with the facts.

From DXOMark: " The Sony Alpha 1 is the new Sony full-frame mirrorless flagship, sitting above the Sony A9 and the Sony A7 models. Housed in a familiar-styled and still relatively compact body, the Sony A1 features a completely new 50 MP “stacked” BSI CMOS sensor capable of 30 fps bursts (lossy compressed RAW/JPEG only), blackout free, and captures 8K/30p video."
https://www.dxomark.com/sony-a1-sensor-review-speed-and-quality-in-one/

From PC Magazine: " The A1 sports a brand-new sensor, one that shares the Stacked BSI CMOS tech that allows the a9 to capture photos silently and without any blackout, but with more than twice the resolution—50MP. To deliver a clear view from the sensor, Sony has upped EVF resolution and size (9.4 million dots, 0.9x magnification) and improved its refresh rate to 240fps."
https://www.pcmag.com/news/sony-a1-marries-stacked-sensor-tech-with-50mp-capture

From DPReview and Tech Insights: "The Sony IMX610AQL is a full frame (FX format), 50.1 MP, 4.16 μm pixel pitch, stacked back-illuminated (ExmorRS) CMOS image sensor from the Sony Alpha 1 (ILCE-1) MILC."
https://www.dpreview.com/news/2070774702/sony-s-flagship-a1-camera-appears-to-be-using-an-exclusive-imx610-image-sensor#:~:text=Sony's%20flagship%20a1%20camera%20appears%20to%20b

The illustration below of Sony's (ExmorRS) 50mp Stacked BSI sensor in the Sony A1 is from Sony's own website.

From Imaging Resources: " The Sony A1 has the highest megapixel count of the three. It beats out the 45.7MP Nikon Z9 by a small margin. However, the Canon EOS R3 lags at 24.1MP. All three cameras incorporate a stacked, backside-illuminated CMOS image sensor."

From B&H Photo and Nikon in their intro to the Z9: "The core of the Z9 is the newly developed FX-format 45.7MP BSI stacked CMOS sensor. Its stacked design offers fast readout speeds and helps to reduce rolling shutter, and the BSI design contributes to impressive clarity and minimal noise when working at higher sensitivities."

From Canon-Europe: "Mastering movement at 30fps. At the heart of the EOS R3 is a backside-illuminated, stacked sensor – developed exclusively by Canon. It is faster and more sensitive than anything we've put in a camera before, which means better performance when you're shooting under pressure."


As EVERYONE else in the photo world but Larry knows, these sensors are BOTH BSI and stacked. Looks like nothing will get through to him, not even from Nikon, Sony, Canon or from any top photo tech experts and testing groups, so sad. Larry is a lost cause here for sure on this. Best to just ignore Larry here on this subject and move on. He seems oblivious to the truth.

Of course the newer stacked BSI CMOS sensors in more recent cameras like Sony A9 (released 2017) , A9II (released 2019) , A1 (released Jan. 2021), Canon R3 (released Nov. 2021), Nikon Z9 (released Dec. 2021), Z8 (released May 2023) , Sony RX10IV (released Sept. 2017) are NOT the old and non-stacked BSI sensors of 2012, but they are stacked BSI CMOS sensors of recent years and today.

Larry refuses to admit the reality of that truth.

You can lead a horse to water, but can't make it drink, seems appropriate here for Larry , sadly.

Cheers and best to you all.

The point here is that neither Nikon nor Sony are telling anyone that, at least not the Sony semiconductor folks. And the drawings and writings support that the LATEST generation of sensors do not have a backside component.

And I am not asking anyone to drink my Kool Aid. But I am suggesting that folks might find it interesting if they get off of their own lazy, hard-headed backsides and get illuminated by sensing and reading the references I provided a long time ago.

Quite frankly, dealing with you folks is at least three times harder than dealing with the high school freshmen that I've been with for the last couple of months. They at least know how to click on and read references and resources that have been identified and provided.

Hey larry, Gwilliams, et. al. I think you are in violent agreement. Please stop the name calling and listen to each other.

To understand all this let's review how digital sensors have evolved.
(1) CCD was first

(2) CMOS evolved to replace the CCD.
CMOS was almost as good, facilitated large volume production, using CMOS semiconductor processes, and much cheaper to manufacturer.

But it was not perfect. The light sensitive layer was buried under several layers of semiconductor layers.

The Terminology is confusing. The back side of the sensor is not equivalent to the back side of the camera. The sensor back side is the bottom layer in the manufacturing process. During the manuf process, layers are added on top of this bottom layer. CMOS photosensitive layers are several layers "up" from the bottom (back side). The back side of the sensor faces the lens in the camera. With a CMOS sensor, The light has to go through several layers to get to the photosensitive element. This reduces the amount of light.

(3) BSI is the next improvement
BSI is a different process, it's still CMOS, but layers have been re-arranged. The photosensitive element is on the backside, not several layers up from the bottom (backside). So when it is flipped and installed in the camera the light hits the backside, and the photosensitive element, without having to go through several layers of semiconductor.

(4) stacked CMOS is the latest improvement
Note: Stacked BSI and Stacked CMOS are two terms for the same thing. The Stacked CMOS is still BSI but with an improvement. Stacked CMOS puts the electronics nearer the sensor, to facilitate high speed data transfer from sensor to the computer.

I hope this helps clear things up.

The following link is to a good top level article that explains what I just said above and it includes nice pictures.
https://www.pcmag.com/how-to/whats-the-difference-between-cmos-bsi-cmos-and-stacked-cmos

The point here is that neither Nikon nor Sony are telling anyone that, at least not the Sony semiconductor folks. And the drawings and writings support that the LATEST generation of sensors do not have a backside component.

And I am not asking anyone to drink my Kool Aid. But I am suggesting that folks might find it interesting if they get off of their own lazy, hard-headed backsides and get illuminated by sensing and reading the references I provided a long time ago.

Quite frankly, dealing with you folks is at least three times harder than dealing with the high school freshmen that I've been with for the last couple of months. They at least know how to click on and read references and resources that have been identified and provided.