Native ISO's on M9?

[former member]

That would be "when LEVEL 6 camera geeks talk shop".

I could list assembly language source code for changing the pre-amp gain on the A/D that I used. I cached the settings and speeded up the conversion rate dramatically. But it could result in spontaneous non-geek combustion.

 

[back alley]

That would be "when LEVEL 6 camera geeks talk shop".

I could list assembly language source code for changing the pre-amp gain on the A/D that I used. I cached the settings and speeded up the conversion rate dramatically. But it could result in spontaneous non-geek combustion.

my deepest apologies...as i understood absolutely nothing said it was impossible for me to accurately gauge what geek level you chaps were at...😀

 

[former member]

I rely on that fact. I make this stuff up as I type.

 

[jaapv]

We must consider one thing, On the M9 Leica has shifted the definition of the black point in the DNG parameters to get a noise reduction (just like Canon does I believe) so the output is biased.

 

[former member]

Do they truncate the output of the A/D converter, or just set a parameter in the DNG header to define a noise floor? If it the latter, the parameter can be ignored. A noise-reduction algorithm can simply operate on the raw values.

 

[Keith]

Is there a phrase book available for this thread ... who do I contact? 😀

 

[former member]

Keith, I put in the link for the Long data sheet for the KAF-10500!

It should be intuitively obvious to the most casual of readers after skimming through...

 

[jaapv]

Do they truncate the output of the A/D converter, or just set a parameter in the DNG header to define a noise floor? If it the latter, the parameter can be ignored. A noise-reduction algorithm can simply operate on the raw values.

They set the parameter in the header. Thanks for the explanation.

 

[sojournerphoto]

We must consider one thing, On the M9 Leica has shifted the definition of the black point in the DNG parameters to get a noise reduction (just like Canon does I believe) so the output is biased.

No, Canon doesn't, but Nikon does. That's why astrophotographers prefer canons - by stacking multiple shotes they pull data from below the single frame noise threshold.

Canon raw is raw (ignoring on chip NR). Nikon is processed a bit.

Mike

 

[Gabriel M.A.]

No, Canon doesn't, but Nikon does. That's why astrophotographers prefer canons - by stacking multiple shotes they pull data from below the single frame noise threshold.

Canon raw is raw (ignoring on chip NR). Nikon is processed a bit.

If somebody finds a Nikon DSLR that doesn't, then, does that mean it'll be...a collectible? 😉


BTW, the only parts I understand fully in this thread is all the computer science stuff...as for all the other electrical engineering lingo...bad memories from college.

 

[willie_901]

The OP's observation that Canon's noise levels depend on whether or not multiples of the base ISO are selected is unique to Canon technology. If I remember correctly, Canon's current bodies use different technology and do not have this base ISO quirk. At any rate, non-Canon cameras do not benefit from setting ISO in multiples of the system base ISO.