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arbitrage wrote:
It has almost zero chance of having a stacked sensor. Therefore it will never have 1/250 readout which is as fast as the A1. It will probably readout somewhere around the A7SIII. Remember even the A1 only reads at 1/60 in video mode.
It is going to get the updated body (probably the A7SIII flip screen as I'm sure it will be video centric), it will get the XR, it will get the new menus, it will gain the nice responsivness of operation like SIII and A1. It will get the dual SD/CFe-A slots. It will probably get the A7RIV EVF (but even the A9 EVF would be an upgrade). I doubt it will get the A7SIII EVF, but maybe. It will get the RIVa LCD as there must be some production issue with the old one. It will get the new video specs as rumored....Show more →
Regarding your comment of having zero chance of having a stacked sensor:
I am not really knowledgeable enough to say if the A7IV sensor has a chance to be stacked or not, but my thought process on the "It has a chance to be stacked" alternative goes like this:
* Most/many/all smartphone sensors are stacked these days.
* The latest RX100 versions use a stacked sensor.
* The recently announced m4/3 sensor from Sony is stacked (will most likely come in the GH6 and rumored early 2022 body from OM/Olympus).
On the cost side:
- Stacked sensors are more expensive to make.
+ Stacked sensors have components in the stacked layer that don't need to sit on other circuit boards.
+ A stacked sensor with enough high read out don't need a mech shutter in the body (that is an outside of Sony made component).
I have no idea how the real numbers for the above business case will look.
But, if the A7IV shall be on the market 3+ years as Sony has done with the A7II-A7III and now A7III-A7IV it needs to be a good seller and stand well until the shift 2024/25.
The new m4/3 stacked sensor seems to have on all pixels the possibility for HDR and also for "Phase difference". Sony seems to call that All-pixel-AF. And it then has no holes in the sensor so no image quality impact.
That technology would resonate well with the rumor that the A7IV will have very good AF so chances are that the A7IV sensor will have it too. But maybe one doesn't need to have the sensor stacked for that tech, I can't really say.
As for price, all new Sony models are more expensive at their launch than what the previous model was at its launch so I guess that the A7IV will cost what the A7III costed at launch plus 500 USD or so.
The A7III sensor Sony also use in the A7C and sold to others. It sits in Nikon Z6/Z6II, Panasonic S1, Leica SL2S and Sigma fp.
And Sony might count on the new A7IV sensor to also do that over time, making the volume higher.
If that is enough to sustain the business case for a 3+ year model on the market, I can't really say so the above is just guess work.
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