bclaff

Lives in United States Metro-West Boston, MA, United States
Joined on Nov 4, 2006

bclaff's recent activity

  • But Fujifilm does not bake NR into their raw files. (Except the X100F at ISO 51200). Not sure why you'd make that statement especially since you acknowledge there's no evidence! Fujifilm does shift ...
  • Rather than trim I just highlighted the crux of your question by making it bold and I'll repeat it here: "why does a full frame image held up better in much larger prints than a smaller sensor with ...
  • Photographic Dynamic Range (PDR) measurements can be affected by poor data collection. That situation isn't normal but it does arise. But Read Noise is very hard to get wrong since it's taken from ...
  • The sensors do appear to be identical but the X-T2 has slightly lower read noise than the X-E3 This is entirely possible because of factors other than just the sensor. For example, other circuitry, ...
  • Replied in Fortunately...
    There are other possible reasons including poor data collection by DxOLabs. (This does happen.) For those three I have the following: Sony ILCE-7RM3 DxOMark 59% PhotonsToPhotos 57% Olympus OM-D ...
  • You misunderstand. I'm not talking about variable f-number zooms but constant f-number zooms that may use a variable physical aperture in their design.
  • Replied in Fortunately...
    What the surprise? Adjusted for Print size they should be roughly the same.
  • It doesn't matter how the f-number is accomplished. I suspect that a design that uses a fixed maximum aperture size is easier to manufacture. I think the variable aperture size seen in some lens ...
  • Thank you. Yes, the "extra" tick marks (drawn slightly thinner) are called Field Stops. They are meant to block stray rays. In that lens design it happens that the three elements between them ...
  • You mean Bob≠Bob and Iliah≠Iliah :-D
  • Yes, with care, you're taking advantage of the Bernoulli Effect. (Usually applied to fluids but also applied to gases.) The safest angle would be straight across the opening.
  • Replied in Aberrations?
    The larger physical aperture would hard vignette because of the diameter of the optical elements behind the aperture. No free lunch. A larger physical aperture would be too large for elements ...
  • First some terminology. Not constant f- stop but rather constant f- number . Also, not aperture diameter but entrance pupil diameter. The ratio of entrance pupil diameter to focal length can be ...
  • D7500 yes, D5600 no. For example see the Read Noise in DNs :
  • Replied in Fortunately...
    Agreed. I don't see substantial differences in the QEs that I measure at PhotonsToPhotos (and don't bother publishing for various reasons). And there's no reason to believe that any improvements in ...
  • You miss (or ignore) my point. You don't have to expose for the optimal raw to get value out of shooting raw+JPEG.
  • Replied in Fortunately...
    Yeah, I forgot about the square / square root effect.
  • FWIW, I shoot raw+JPEG in sRGB and processes my raw files as 16-bit Adobe Wide RGB (converting to sRGB at the end). This makes my Out Of Camera (OOC) JPEG totally usable but gives me the best data ...
  • Only if you expose for the RAW rather than the JPEG and not if you choose to use the RAW as a "lossless" version of the JPEG with more exposure latitude. I consider it an advantage rather than ...
  • Replied in Fortunately...
    Looks like 6dB for one stop, not 3dB: 10^(6/20) = 2
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Last upload May 28, 2012