iQ3 100 Tri vs IQ250 noise at high ISO

Questions, comments and suggestions regarding Phase One IQ4, IQ3, IQ2 and IQ1 series digital camera backs.

iQ3 100 Tri vs IQ250 noise at high ISO

Postby Joerg1 » Mon Dec 17, 2018 9:20 pm

Hey there,

I did an upgrade coming from IQ250 to IQ3 100 tri.
Everthing is fine, color is amazing.
But I do recognize an increase of noise at high ISO starting at 800 at the tri.
In my memory the 250 was better.....

Is that true, or do I miss something ?

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Re: iQ3 100 Tri vs IQ250 noise at high ISO

Postby NNN635934946108963955 » Sun Feb 09, 2020 8:20 pm

Hi there,

I Just own a P65+ but did some test with the IQ3100.

Sure High ISO is awsome with CMOS, but what I found out, that the base 50 ISO IQ3 100 had more ground Noise than my old back and ist more blurry or looks already denoised from the start.

It can be due to that the pixels on the sensor are much much smaller so the noise level is higher because less light is hitting the photo-sights.
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Re: iQ3 100 Tri vs IQ250 noise at high ISO

Postby C-M-B » Sat Feb 15, 2020 7:27 pm

I'm not sure whether this comparison qualifies but I've found that my GFX 50S (which has the same sensor as the IQ250) at ISO 100 is less noisy than the P65+ back at ISO 50 - that is with the same exact settings with regards to sharpening, noise removal etc.
But the difference is really small and would not be observable even with larger prints.

Of course the same can't be said about noise beyond ISO100-200 or during long exposures, this is where CMOS shines. But we have to keep in mind that CCD sensors can still be extremely usable at low ISOs for short exposures.

And yes, the pixel size does matter:

P65+: CCD pixel size 6 micron
‎IQ2 50: CMOS pixel size 5.3 micron
IQ3 100: CMOS pixel size 4.6 micron

So the IQ250 can make up the difference of 0.7 micron with its newer technology, but the IQ3 100 is another 0.7 micron smaller...and that's quite a significant difference. A lot of cameras with small micron pixels have noise issues - it's just physics.

So if you buy a high res camera, don't expect less noise.
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