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Sony A7S III announced
#11
The Canon EOS R5 can do two things to get to 4K30, the Sony A7S III does one thing.
The R5 can do "low quality" 4K30/60/120, going from 8K to 4K with pixel binning. This results in a slightly lower quality than you get with the A7S III with its normal 4K resolution.
The R5 can do "high quality" 4K30, going from 8K to 4K via oversampling. This results in a slightly higher quality than you get with the A7S III. The oversampling is the most heat producing mode.
With 4K60 and 4K120, the A7 III has a slight advantage.

The R5 has a higher bitrate, which results in a bit more detail too.

The R5 has a lot better IBIS for video, and a lot less shutter lag jello. And of course the smoother DPAF. It also offers both UHD and DCI 4K/8K, and the superior to work with C-log over Sony S-log2/3.

Both cameras have advantages over the other, with the R5 obviously having a much higher resolution, and the A7S III one to two stops better noise at pixel level at really high ISO settings. If one for whatever reason tends to shoot 4K video for half an hour long takes, the A7S III has a slightly better quality because the R5 "HQ" oversampling can overheat in 30 mins. For vlogging kinda stuff, the R5 with its much better IBIS and smooth AF has the advantage.
As stills camera, only if you need high ISO low light performance and don't need higher than 12mp, the A7S III is a better choice.

(07-28-2020, 10:03 PM)davidmanze Wrote:
(07-28-2020, 08:34 PM)Brightcolours Wrote:
(07-28-2020, 08:22 PM)davidmanze Wrote: I have watched at least a dozen video on the R5 and A7SIII and every video of the R5 have confirmed overheating ..... with the exception of one 4K lower quality mode ...... 
 OTH ...... the A7SIII had only one 4K mode that overheated eventually (nearly an hour) ...all the other modes could record continuously well over the the R5's 29min limit... there is no comparison here ....... the A7SIII basically doesn't overheat and has no limit in record time. 
 
A pro-video shooters review of the A7SIII:

https://www.youtube.com/watch?v=AG79FkN7EPk

Remember don't shoot the messenger !!
If it is warm enough, the Sony's new passive cooling can't lose the heat to the war outside, making the Sony overheat before the Canon. The Panasonic with its fan did best in warm weather, and the Fuji worst.

Which "war" are you talking about BC ??..... there's been so many !!

The war of energy, Dave... Also known as "warmth" without the "typo / spell check" going on.
#12
(07-29-2020, 08:25 AM)davidmanze Wrote:
(07-28-2020, 09:46 PM)Klaus Wrote: I guess the Sony doesn't require any binning at 4K - meaning less processing - resulting in less heat.

It would be interesting to know how their passive cooling system works!

All the Sony enthusiasts hyperventilating at the back of the body... ;-)
#13
(07-29-2020, 08:25 AM)davidmanze Wrote: It would be interesting to know how their passive cooling system works!

Just a heat sink structure drawing heat away from back of sensor and from the processors to the front of the camera.
#14
although personally I don't care...but A7siii does overheat and sometimes faster than R5
https://petapixel.com/2020/07/30/sony-a7...es-report/
#15
(07-30-2020, 06:52 PM)toni-a Wrote: although personally I don't care...but A7siii does overheat and sometimes faster than R5
https://petapixel.com/2020/07/30/sony-a7...es-report/

 In this "one case scenario" in Florida in full sunshine at the height of summer the A7SIII overheated a minute or two faster than the R5 ........ although the R5 had to be restarted again due to the 29 min shooting limit to achieve those few minutes ..... (so in any case it wasn't continuous shooting)

 This "wasn't" because the A7SIII's sensor was causing the overheating so much as the heat of the sun was conducted to the sensor by the passive cooling system which was "adding" to the normal heat created by the sensor itself...... 
.... this would not have happened had any form of shade would have been provided !!...


OTOH ...... "in shade or not" the R5 "cannot get the heat out to the outside world" and as a result the time for the camera to cool down is huge ..... with people observing "very long cooling down periods" before the camera can shoot again and even then, for short durations before it heats back up again.
 
This has been confirmed by those who have attempted to cool the R5's exterior with ice-packs placed on the body .... as well as fans, "it makes little difference" ........ that cooling just doesn't reach the sensor which lives insulated remaining hot.
 
  So this minuscule two minute victory for the R5 is rather hollow and pretty much ends there!
Dave's clichés
#16
It's not about which is best. Overheating is a physical limitation to almost all cameras nobody has been taking about. It has finally been assessed (although with exaggeration)
My A6000 overheats at 20 minutes in FHD not even 4K, and almost all Sony APS-C line does the same... yet nobody was listening when we complained... now Sony has to listen.
We have a proverb that says : "if your house is made of glass you don't throw stones at people" Sony is much more widely affected with overheating, now they must take it seriously
#17
How quick is this?

https://www.youtube.com/watch?v=jkhkYDd-SLU

The white square under the fan looks to me like Peltier diode stack ........ the type used in portable caravan hot/cold boxes .... they are very inefficient and this unit needs some sort of USB connecting power supply to drive it ..... probably a Lithium ion power pack ......
........ amazing how some manufacturers can jump on a market in such a short time!
...... it's probably useless!

The guy posted back after my comment:

? Gaston Shutters a répondu : "Yeah if it does have that technology yes it will draw a lot of current."
Dave's clichés
#18
(07-31-2020, 05:09 AM)toni-a Wrote: It's not about which is best. Overheating is a physical limitation to almost  all cameras nobody has been taking about. It has finally been assessed (although with exaggeration)
My A6000 overheats at 20 minutes in FHD not even 4K, and almost all Sony APS-C line does the same... yet nobody was listening when we complained... now Sony has to listen.
We have a proverb that says : "if your  house is made of glass you don't throw stones at people" Sony is much more widely affected with overheating, now they must take it seriously

The A7S III heats up more, that is why the camera overheated 1st in the same hot situation with a lower bitrate than the R5.
However, the passive cooling Sony is proud of does cool it down faster.

People note that the R5 never feels hot, the battery never feels hot when it does give the overheat warning. The biggest issue is that the camera (at this pre-production state) turns off overheating protection as soon as HMDI recorders/monitors get connected, where it will overheat way sooner in 8K and 4K60, and even in other more "normal" 4K30/24 modes. 
So, the overheat stop looks to be set quite conservative, and the HDMI issue should get a fix in the firmware, and if the camera does heat up, the A7S III's cooling structure is more efficient.

The R5 appears to be an amazing camera, with many aspects beating the Sony A7S III in video (a big higher quality 4K when in HQ mode (oversampling), much better video IBIS, much lower shutter jello and being a great high resolution stills camera. The A7S III does better in really high ISO, of course with a quarter megapixels/half the resolution.

By the way, there probably is a good reason for Sony's weak IBIS with their FF cameras: the corners of the sensor already hide behind the mount without the sensor moving so probably they just can't move further to get better IBIS. The difference between the Sony FF IBIS and IBIS from Fuji, Nikon, Olympus already had been noticed.

A shame we can't have a honest discussion on here about these things, to keep things in perspective. Even pointing out facts like that 4K60 is for slow motion falls on deaf ears, here.
#19
Wow, what a fanboy comment ;-)

If pros say that the R5 isn't fit for video purpose, it isn't.

The A7s has been used for years in its various versions. The S1H remains the one to beat I reckon.

That is - if you are into toys. If my income would depend on it, I'd buy a Red Helium anyway ;-)
Chief Editor - opticallimits.com

Doing all things Canon, MFT, Sony and Fuji
#20
(07-31-2020, 11:33 AM)Klaus Wrote: Wow, what a fanboy comment ;-)

If pros say that the R5 isn't fit for video purpose, it isn't.

Further thoughts from this video

  from approx. 16 mins - 20mins



https://www.youtube.com/watch?v=Xa2zNmPatz4

There's a lot of waffle as it's a photography debate but .....
Dave's clichés
  


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