NiniBuba

I talk with guy from Rental and they stop using dummy battery because they fried one a7ii. But on Power USB they record few hours on a7siii. 
 

Hi guys !  At start sorry for my English. 
I'm first person in my city who rent a a7iv for test (Poland), Warsaw) and start talking to people about overheating problems

In my opinion a7iv is good camera but have few problems which will be out soon.
All reviews are wrong and they lie about test and time of long recording.
I didn't have much time for all test but few my test bellow!. Please do your own test and write in comments

tripod + open screen, temp set to HIGH
4k HS 200 Mbps 50fps (AF-C when nobody sitting on front of camera)
Nothing bad happened and first original battery finish after 1h:34min and i change to second battery and stopped the test after 1h50min
> I got a better time than stated by SONY ( +25min)

I wait until camera cold down (30 min) and start another test with fresh battery 

tripod + open screen, temp set to HIGH
4k HS 200 Mbps 50fps (AF-C when my friend was on the front of camera for all the time and eye tracking need to work )
Camera show after 35min overheating icon and turn off in 55min
> I got a worse time than stated by SONY ( -15min)

* For sure the time of recording with active AF-C is less then on SONY website
https://helpguide.sony.net/ilc/2110/v1/pl/contents/TP0002922662.html?fbclid=IwAR0-7-VTkXG6ENh9aArqD8eGcJccNib5I7KEBP_Avchury7Z2dl_BijEKvM
**I'm afraid it will much worse in summer when we gonna run and gun with AF-C and IBIS. Hand-held will accelerate heating issue (what do you think ?)

POWER USB DON'T WORK CORRECTLY

TEST 1 POWER USB
tripod + open screen, temp set to HIGH
4k HS 200 Mbps, 50fps  record 25min and turn off (overheating)
(AF-C when my friend was on the front of camera for all the time and eye tracking need to work )
> I got a worse time than stated by SONY ( -45 min) !!!
* Time between POWER USB 30 min and always fresh original battery

TEST 2 POWER USB
tripod + open screen, temp set to HIGH
(AF-C when my friend was on the front of camera for all the time and eye tracking need to work )
4k HS 100 Mbps, 50pfs  record 17min and turn off (overheating)
> the shortest time I got. I have problem with my a7iv or SONY screwed up
* Time between POWER USB 30 min and always fresh original battery

TEST 3 POWER USB
tripod + open screen, temp set to HIGH
(this time i check manual focus MF)
4k HS 100 Mbps, 50fps  record 17min and turn off (overheating)
> I got a worse time than stated by SONY ( -105 min) !!!

The same setting like above but without POWER USB , and on AF-C, (fresh battery)
tripod + open screen, temp set to HIGH
4k HS 100 Mbps, 50fps  record 1h 30 min.  and turn off (overheating)
(AF-C when my friend was on the front of camera for all the time and eye tracking need to work )
> I got a worse time than stated by SONY ( -50 min) !!!
But after 5 min cold down and changing battery he record again 1h and sd card v90 finish.

>>>My conclusions and thoughts<<<
1) All tests carried out by YouTubers are wrong. They record record the wall (item)  not human (AF-C and eye tracking) , so should should not be taken seriously. ( You know $$$)
2) Generally, the shooting times of 4k 200 Mbps where the AF-C really needs to work are below the guaranteed times.
3) The shooting times 4k HS 100 Mbps, 50fps where the AF-C really needs to work are HIGHLY below the guaranteed times.
4) USB POWER DON'T WORK CORRECTLY
5) I believe that the results of shooting by handhald may be even worse because there will be a problem with the cooling of the a7iv in the hands 
6) I believe that the situation with the overheating of the a7iv in the summer could be much worse and we need to have that in the mind before buy.
 

So far, I cannot perform any more tests and I would like to remind you that such results can only occur with me! However, I will be pleased to know your results, provided that you do not record the wall and you do not work for SONY.

XAVC HS 4K 200 Mbps 50fps - record 55min (tripod, af-c) (sony write 1 h 10 min)
XAVC HS 4K 100 Mbps 50fps - record 1h30min (tripod, af-c) (sony write 2 h 20 min)
USB POWER - max 25 min record
Is it ok and worth buying? Is it better to wait and see how the situation unfolds?
I leave it to you, but one thing is for sure, the Internet reviews sucks and you shouldn't trust the reviews and read the comments with caution and an open mind.
 

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