GH5 100 ASA or 400 ASA in sunny days - video?

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FoxAdriano

Well-known member
Hi, with my GH5 I made some tests in sunny days and I noticed a a better video quality with more details. But I don't know what could it happen when I wil have to use the camera for more important jobs. What is your opinion? What problem could I get shooting in 100 ASA in sunny days? Thanks
 
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Slap an ND filter on your lens and you will have more choice with shutter speed and desired aperture. I try to stay away from 100 because of loss of dynamic range.
 
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You can’t recover DR in post. And that’s bad.

What mark said - shoot native ISO to maximize DR - especially on sunny days. And use ND filters. Or a Variable ND. I like the SLr magic.

For added convenience use step up rings to convert all your lenses to 77mm, order a pack of xume adapters to make things easy, and buy two good 77mm VNDs (always have a backup in case you drop or break one)
 
The thread title asks to make a choice between 100 and 400 ISO. Just to be clear, 200 ISO is considered a base ISO and you will not suffer a loss of dynamic range when using it.

100 ISO is considered an "extended ISO" and has less dynamic range. So 200 is a good choice (still with ND filter to tame DOF and shutter speed) for outdoor sunny shooting.
 
^^ I do not believe that is correct. I was under the impression the base ISO of the GH5 is 400 and you lose about 1 stop of DR by dropping to 200.
 
filmguy123 said:
^^ I do not believe that is correct. I was under the impression the base ISO of the GH5 is 400 and you lose about 1 stop of DR by dropping to 200.
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There exists a lot of conflicting information about this on the internet. I've seen answers ranging from 200 to 400 to even 800 as the base ISO for the GH5.
DXOMark actually has a graph that shows the GH5's greatest dynamic range is at 100 ISO!

From personal experience, I have seen no real loss of dynamic range going from 400 down to 200 ISO. If there is any, it is certainly not 1 stop of loss.

I think the misinformation comes from knowledge of certain cameras that DO lose dynamic range when their ISO is lowered. But most DSLR style cameras have their best image quality at their lowest ISO setting (barring any "extended ISO" setting). But since Panasonic has never officially revealed the GH5's native ISO, it all seems like speculations. Especially since reputable testing sites all publish contradictory results.
 
dvbrother said:
There exists a lot of conflicting information about this on the internet. I've seen answers ranging from 200 to 400 to even 800 as the base ISO for the GH5.
DXOMark actually has a graph that shows the GH5's greatest dynamic range is at 100 ISO!

From personal experience, I have seen no real loss of dynamic range going from 400 down to 200 ISO. If there is any, it is certainly not 1 stop of loss.

I think the misinformation comes from knowledge of certain cameras that DO lose dynamic range when their ISO is lowered. But most DSLR style cameras have their best image quality at their lowest ISO setting (barring any "extended ISO" setting). But since Panasonic has never officially revealed the GH5's native ISO, it all seems like speculations. Especially since reputable testing sites all publish contradictory results.
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I think your answer is very balanced and sensible. If you had to shoot in a place near equator where there is a lot of sun, which of them would use usually 100, 200, 400 or even 800 ISO?
 
dvbrother said:
DXOMark actually has a graph that shows the GH5's greatest dynamic range is at 100 ISO!
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I don't know if things have changed since the last GH5 firmware update, but apparently highlights clip faster when shooting at ISO 100. I have not tested to confirm this ( I'm as lazy as the rest of you ), but it's something I would test for if you plan on using ISO 100.
 
dvbrother said:
apparently highlights clip faster when shooting at ISO 100. I have not tested to confirm this ( I'm as lazy as the rest of you ), but it's something I would test for if you plan on using ISO 100.
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Sorry, with my bad engish I don't understand what you mean with "highlights clip faster". I trust you because you have a lot of experience and you said things that others did not say. I hope for a future test. ;)
 
FoxAdriano said:
I don't understand what you mean with "highlights clip faster".
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You will see less recorded highlight detail. This should be easy to test...

1- Shoot some footage at ISO 100 that includes some challenging highlight detail.

2- Shoot the same footage again at ISO 200. ( adjust your aperture or use a 1 stop ND filter to compensate for the exposure change )

3- In your video editor, check to to see if the amount of recorded highlight detail is better, worse, or the same between ISO 100 and 200.
 
You definately lose dynamic range when shooting in extended ISO.

400 iso is base no dynamic range loss in the log profiles. In non log profiles its 200.
 
dvbrother said:
There exists a lot of conflicting information about this on the internet. I've seen answers ranging from 200 to 400 to even 800 as the base ISO for the GH5.
DXOMark actually has a graph that shows the GH5's greatest dynamic range is at 100 ISO!

From personal experience, I have seen no real loss of dynamic range going from 400 down to 200 ISO. If there is any, it is certainly not 1 stop of loss.

I think the misinformation comes from knowledge of certain cameras that DO lose dynamic range when their ISO is lowered. But most DSLR style cameras have their best image quality at their lowest ISO setting (barring any "extended ISO" setting). But since Panasonic has never officially revealed the GH5's native ISO, it all seems like speculations. Especially since reputable testing sites all publish contradictory results.
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DxO's results were with RAW images. Since the GH3, ISO 100 has been crippled in JPG's, which I found out to my dismay/disappointment in test shots, but relieved to find RAW 100 highlight DR slightly better than 200, as DxO testing has consistently shown from GH3 up. So Panny, why not just just bake a smooth JPG highlight roll-off into the 100 as it is in 200+, as it's been a straight line to the top for years now??

True RAW-based video would take immense processing power, and am I correct in assuming that the RAW video formats commonly used in other brands are basically uncompressed JPG?
 
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Peter Berry said:
True RAW-based video would take immense processing power
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Only in post. RAW sensor data requires VERY little in-camera processing, so the only real issue is having enough storage room and fast memory to handle large amounts of sensor data.
( it's the highly compressed video formats like h.264 / h.265 that require immense amounts of in-camera processing power )
 
From what I know 400 iso in log and 200 iso in other profiles are the same iso despite Panasonic labeling them different.
 
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