ISO improvements of the X100s?

Discussion in 'Fuji X100, X100S, and X100T' started by xdayv, Apr 10, 2013.

  1. xdayv

    xdayv FujiXspot Regular

    54
    Apr 9, 2013
    Philippines
    Dave
    Hi. I would be interested to know what are your thoughts and experiences about the high ISO improvements of the X100s over the X100?
     
  2. Ray Sachs

    Ray Sachs FujiXspot Veteran

    485
    Feb 1, 2013
    Near Philadephila
    In my experience, its a stop or nearly a stop better. The X100 was very good at ISO 3200 and was useable but pretty rough at 6400. The X-Pro, X-E1, and X100s, with the X-Trans sensor are all quite good at 6400 and sort of useable but rough at 12,800 (which isn't a native ISO - its a jpeg only option). There's a question of how these ISO values compare to other cameras, but clearly they're pretty comparable between the X100 and newer X-Trans Fujis.

    So, I'd say about a stop, give or take.

    -Ray
     
  3. Argus

    Argus New to FujiXspot

    6
    Apr 13, 2013
    I find X100S to underexpose up to 2/3 stop compared to X100 with equal ISO, aperture and shutter speed. Taking that into account, I am not sure how much improvement X100S is in terms if image quality. It also looks as X100S has more aggressive NR than X100. I have just compared up to ISO 3200.
     
  4. Ray Sachs

    Ray Sachs FujiXspot Veteran

    485
    Feb 1, 2013
    Near Philadephila
    That's interesting. We had a recent discussion of Fuji ISO inflation and I'd seen it with the X-Pro and (to a slightly greater extent with the X100s). I never noticed anything that gave me any reason to do any comparisons when I had the X100, but given that it was a Bayer sensor, maybe the changes in the way it exposes at a given ISO started with the X-Trans sensor?

    -Ray
     
  5. Armanius

    Armanius FujiXspot Top Veteran

    691
    Feb 1, 2013
    Texas
    Muttley
    Dave, to my eyes, the X100S appears to have a slight edge over the X100 in high ISO. But the X100's files sharpen up better in Lightroom than the X100S'.
     
  6. Argus

    Argus New to FujiXspot

    6
    Apr 13, 2013
    Hi Ray,

    I acutally haven't compared the ISO sensitivity between the X100/X100S and the X-Pro1. It is kinda odd as these ISO differencies interest me. However I have compared the X100 and X-Pro1/XF 35mm with 5DII/5DIII , 35L and 50L. At the moment I cannot say if there is any difference between the X100S and X-E1/X-Pro1 regarding the ISO.

    There is a very good review with comparison between the X-E1 and 5DIII. I think it's one of few if not the only one where the difference in ISO sensitivies in mind before the image quality is compared. I'm afraid this might be known to you already but here it goes:

    Martin Doppelbauer: Review of the Fujifilm X-E1
     
  7. Ray Sachs

    Ray Sachs FujiXspot Veteran

    485
    Feb 1, 2013
    Near Philadephila
    Thanks for that link Martin. It appears his findings relative to the Canon were very similar to mine relative to a few other cameras. I raised that in THIS thread. There were some concurring anecdotes but also a fairly good technical discussion that refuted the assertions, at least partially. Based on various factors such as how the cameras expose differently. Its worth a read if you want to dig down further into this. My ultimate conclusion based on a combination of what I've experienced and what I've read is that the Fuji models (at least those with X-Trans sensors) are very good low light cameras, but that they're not much, if any, better than a number of competing models that they initially may have appeared to be notably better than.

    -Ray
     
  8. Argus

    Argus New to FujiXspot

    6
    Apr 13, 2013
    Thanks Ray. Interesting thread. It only raises my curiousity whether there is any difference between the X-Trans generation I in X-Pro1/XE-1 and II in X100S regarding higher ISO and the noise reduction, even in RAW? I don't recall posts anywhere complaining about this "plastic" skin effect for X-Pro1/X-E1.
     
  9. ean10775

    ean10775 FujiXspot Top Veteran

    885
    Feb 13, 2013
    Cleveland, OH
    Eric
    I certainly noticed it with my X-E1 in the JPEG files at high ISO
     
  10. bartjeej

    bartjeej FujiXspot Regular

    139
    Mar 31, 2013
    According to dpreview, the X100's actual sensitivity are about 1/6th EV lower the stated ISO values, which they state is within the tolerance allowed by the ISO specification:
    Fujifilm FinePix X100 In-Depth Review: Digital Photography Review

    The X-Pro 1 tested 1/3 to 1/2 stop less sensitive than stated ISO values, which is a bigger difference than usual:
    Fujifilm X-Pro1 in-depth review: Digital Photography Review
    and the same applies to the X-E1:
    Fujifilm X-E1: Digital Photography Review

    So based on those results, it wouldn't surprise me if the X100S overstates its ISO values by the same amount. I hope they'll have a full review of the X100S and include the same ISO value test, so we can know for sure.

    The Olympus OM-D E-M5, for what it's worth, was about 1/3 stop less sensitive than the stated ISO values:
    Olympus OM-D E-M5 Review: Digital Photography Review

    all the above is based on jpeg files, but apparently that's how ISO is supposed to be measured...