dsjtecserv

Lives in United States Northern, VA, United States
Works as a Technical Director
Joined on Jan 21, 2005

dsjtecserv's recent activity

  • I could just as well choose a random exposure to start with, and then adjust it based on results, without ever consulting the camera's meter, or, for that matter, even the histogram. Sure, you can ...
  • It is a mirrorless camera, but I rarely use the live histogram. I'm referring to to the histogram of the shot, which is the distribution of levels in the image. Whatever metering mode was used, or ...
  • First, understand that I'm shooting in manual. In many of the situations I'm describing, I'm not metering at all (such as night sky and Milky Way photography). In others I am likely to have ...
  • Indeed, even when operating from common ground, folks have a way of finding dvision. Dave
  • You seem determined to go down this rabbit hole of hanging your hat on a nuance of no practical significance, while ignoring the key element (or at best, treating it as secondary). That, quite ...
  • I earlier noted that this is one of the reasons that I may not increase ISO at all, or not beyond a certain level. But in that the subject of the discussion is the effect on noise, it remains true ...
  • But in the procedure under discussion, we are not setting a fixed ISO. We are letting ISO float (which can be done either manually or automatically) after setting an optimal exposure. Clearly ...
  • You are splitting the finest of hairs, and thereby losing your message in the forest of irrelevancies. I actually have stated that the exposure need not affect the brightness of the image, because ...
  • This makes no sense. What I told you was that I vary ISO independently of exposure, with no corresponding change in noise, and you have not addressed that. Nonsense. The change in ISO has no ...
  • It does not correlate with noise. The exposure values both correlate with and affect noise (specifically, signal to noise ratio). But I can adjust ISO independently of exposure and there is ...
  • No it doesn't. I set the shutter time and aperture consistent with the depth of field, and degree of subject motion I want to record (or avoid). The level of noise that will be present is ...
  • No one disputes that when one allows a change in ISO to cause a change in exposure, that there is a correlation with that act and noise. that is readily acknowledged. But that is NOT the same as ...
  • I don't think anyone, including me, has said that there is not a correlation, at least in common, automatic photography. But mistaking the correlation for causation is the problem, and what leads ...
  • In the situation described, the student failed to raise ISO because of the misplaced assumption that raising ISO "causes" more noise. It makes more sense to teach that less exposure causes more ...
  • That a compelling an very real example of how perpetuating the misleading trope about ISO causing noise leads to unproductive decisions among beginner, which persists among even experienced ...
  • But for the same scene, the "correctly" exposed image at high ISO will have more noise, not because of the higher ISO but because your view of "correctly" involves less exposure. One can choose to ...
  • As has already been amply demonstrated, increasing ISO while holding exposure the same (for instance, using manual control) does not result in more noise. Any action, whether automatic or manual, ...
  • Correct. There may be good reason to increase ISO and thereby decrease exposure and increase noise. But the key is understanding that it is not the ISO that did that, but exposure. Armed with ...
  • I found that with a Google search on "focal length field of view illustration". There may be others. Dave
  • The fact that you (and others) have to condition your statements about ISO increasing noise by noting that that applies only when the camera is in automatic demonstrates why stating that noise is ...
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Total messages 3990
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Last post 1 week ago
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Last post Jun 20, 2018
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Last upload Jun 19, 2019