M240 ISO

[Herman Zhang]

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Should I use ISO 100(pull) or 200 on my m240? Which one will give a better image quality?

[jaapv]

A pull ISO value will always give a lesser dynamic range. If the subject DR allows it, there is nothing against using a pull ISO, provided that you are careful with the highlights But in general the base ISO of the sensor will produce the best IQ. 
 

[strangeboy]

5 minutes ago, jaapv said:

A pull ISO value will always give a lesser dynamic range. If the subject DR allows it, there is nothing against using a pull ISO, provided that you are careful with the highlights But in general the base ISO of the sensor will produce the best IQ. 
 

This. 

[jaapv]

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[dpitt]

The OP asked about  M240 at 100 ISO, the chart above is for the M9. This one below is for the M240.

Dynamic range charts

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[jaapv]

Mea Culpa - it was because I was editing M9 photos whilst answering..🫤

[Herman Zhang]

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But it doesn't seem to have such a significant drop in DR between 100 and 200. 200 will cuase an overexposure if my lens is wide open during daytime.

[jaapv]

No, but as you can see the ISO pull is accomplished by flattening the highlights which means that there is a good chance of blowing them. Better to increase the shutter speed at 200 or stop down a bit. Or use an ND filter. 

[Gregm61]

I’ve never used the pull 100 option on my M262 or MP240, and will not going forward.

If maximizing image quality is the idea, the base native ISO, 200 in the case of these bodies, is the best choice.

[Ernstk]

On 11/14/2023 at 11:59 PM, Herman Zhang said:

But it doesn't seem to have such a significant drop in DR between 100 and 200. 200 will cuase an overexposure if my lens is wide open during daytime.

Why not close it down by a couple of stops?

[a.noctilux]

9 minutes ago, Ernstk said:

Why not close it down by a couple of stops?

New fashion is using the wide open lens to have less dof.

Why buy expensive lens to use it closing down ? 😏

I know that for years as I lend my Noctilux 1.0 often and people rarely use other stops than f/1.

Even if I told that I use f/5.6 with that lens and results are nice.

Some would use neutral filter which can give another type of headache.

[Ernstk]

11 minutes ago, a.noctilux said:

New fashion is using the wide open lens to have less dof.

Why buy expensive lens to use it closing down ? 😏

I know that for years as I lend my Noctilux 1.0 often and people rarely use other stops than f/1.

Even if I told that I use f/5.6 with that lens and results are nice.

Some would use neutral filter which can give another type of headache.

That's not a new fashion. It's been used for decades!

You close the lens down to control exposure and typically improve quality. Why buy an expensive lens and use it wide open?

[jaapv]

45 minutes ago, Ernstk said:

Why not close it down by a couple of stops?

Or use a faster shutterspeed?

[a.noctilux]

34 minutes ago, a.noctilux said:

I know that for years as I lend my Noctilux 1.0 often and people rarely use other stops than f/1

As reaction to this before lending, lately I just let the only F Stop to use...

 

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Side note, after using the Noctilux 1.0 for a while, less than 1/3 of people still want to buy one of those.

[a.noctilux]

😉

Three threads with nice pictures "wide open lenses",