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Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

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  #31  
Old 13th January 2019
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Re: Guess the iso.

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Originally Posted by Bikie John View Post
Which raises an interesting question. Is it better to set the camera to, say, ISO 1600 and under-expose, or 3200 and over-expose with the same aperture and shutter speed?

John
In this situation I would be inclined to slightly over-expose at ISO 3200 and recover the highlights in pp, but there are limits - I wouldn't want to go much above ISO 6400 with the current sensors. It's not only noise that is an issue at high ISO but also loss of detail.

Also, it depends upon the scene. Small, relatively unimportant highlights can be allowed to burn out to protect darker areas from under-exposure but if the highlights coincide with the main subject it might be best to expose these correctly and allow the shadows to remain shadows, i.e. don't attempt to recover them in pp.

I know you are aware of this, John, but it's a great question to ask for the benefit of other members and visitors.
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  #32  
Old 13th January 2019
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Re: Guess the iso.

Over-exposure could also be interpreted as a reduction of ISO, surely? I'm fairly happy with the results I get from ISO3200 and 6400 on my E-M5i. I'd rather have a bit of noise than not get the shot at all, and imho DxO does a better job than the camera of reducing it providing you shoot raw.
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  #33  
Old 13th January 2019
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Re: Guess the iso.

This shot was much more of a challenge as it was taken at ISO 3200 on an old E-3. It has been extensively worked in pp, including the application of selective noise reduction to the shadows using Nik Dfine 2.0. There is no doubt that the MFT 16mp sensors give a much cleaner image with far greater detail at this ISO.

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  #34  
Old 13th January 2019
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Re: Guess the iso.



My plastic Robin at ISO2000...……...Kinda works as per video process. Over exposed in the camera, and pp'd in LR6...

Was through the kitchen window, some 10 metres away, and heavily cropped. (40-150mm pro)
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  #35  
Old 13th January 2019
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Re: Guess the iso.

The problem with high ISO performance is that the subjective results depend on so many factors:

- The size of the output. Frankly at 1024px long side from an uncropped image I'd be surprised if any of the 16Mp Oly cameras struggle at 6400.

- The lighting. High ISO in good lighting always looks better.

- Sharpness - good glass and no motion/camera blur will yield an apparently cleaner image.

- Subject matter - even-textured surfaces will hide noise. Worst for noise is small sharp edges that we expect to be able to resolve - feather detail, eye lashes etc.

- Exposure - under exposure will punish you. ETTR will be your friend, but then you're shooting at an effectively lower ISO.

- Amount of PP. Any actions like shadow fill, sharpness enhancing, clarity, dehaze, increased saturation etc will quickly add noise.

- Mono - you can get away with murder in mono!

Personally, I think for landscape, cityscape, portraits and other more critical stuff then sticking to base ISO is the best strategy. Up to ISO 3200 on the mkii, well-exposed and with good glass is usually OK. ISO 6400 works for less critical stuff if you have to go that high, but large output will give it away.
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  #36  
Old 15th January 2019
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Re: Guess the iso.

Have a look at:

http://www.pbase.com/ajwh/manila

taken with an EM1-i by available light at ISO 16000 - not available in my EM1-ii
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Old 15th January 2019
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Re: Guess the iso.

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Originally Posted by ajwh View Post
Have a look at:

http://www.pbase.com/ajwh/manila

taken with an EM1-i by available light at ISO 64000 - not available in my EM1-ii
Your link says the pictures were taken at iso 16000 ?? not 64000 as you claim.
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Old 15th January 2019
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Re: Guess the iso.

Sorry - wishful thinking. I've edited the post....
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Old 16th January 2019
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Re: Guess the iso.

Quote:
Originally Posted by ajwh View Post
Have a look at:

http://www.pbase.com/ajwh/manila

taken with an EM1-i by available light at ISO 16000 - not available in my EM1-ii
Impressive....

Does anyone use pbase?
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  #40  
Old 16th January 2019
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Re: Guess the iso.

Look at "original" image to see noise....

It was a real "Black cat in a coal cellar" situation - I had no flash, no tripod...

I was reliant on the EVF to see what I was shooting - it was VERY dark
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