dsjtecserv

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

dsjtecserv's recent activity

  • Replied in Depth of Field
    See this page: https://en.wikipedia.org/wiki/Depth_of_field Dave
  • Replied in Depth of Field
    See my response to the first posting of this, above. Dave
  • Replied in Depth of Field
    Well, you are not holding the entrance pupil constant, as was stipulated. If you change from 50 mm to 25 mm, the f-number would have to change from f/8 to f/4 in order for that to be constant. However
  • First, the X pattern is an artifact of variable neutral density filters, not polarizers per se. It is the result of interference between the wavelengths passing through two counter-rotated ...
  • It doesn't matter in the least! The resolution of an image is simply the number of pixels it has. The dpi (dots per inch) or ppi (pixels per inch) only pertains to how many inches those pixels are ...
  • That's a plausible explanation. I didn't suggest that they were. The size of the blur circle at the plane of focus is the maximum sharpness (minimum blur circle size) that can be rendered. In the ...
  • Well, it does and it doesn't, which strikes to an issue which to my mind has never been resolved. Max Lyon's calculator does indicate, with a separate line, the effect of diffraction. But it ...
  • Thanks! There isn't any inherent distortion resulting from tilting the camera itself. The stitching software easily warps the images to fit together, and vertical rotation is not different from ...
  • After reading all of the discussion, I observe that it seems you have made up your mind a priori , and are just looking for justification for it. If your priority is to shoot multi-row panoramas ...
  • A few observations, building on some of the info from earlier posters: (1) The best way to avoid parallax error is to not create it at capture time. That means either being sure that the geometry of ...
  • If you feel that strongly about it, start a new thread and hold forth. You aren't going to help the newbie 7 years later, but you might help some new newbie if you start a new ad properly targeted ...
  • The primary purpose of a beginner's forum is -- or should be -- to answer the original poster's question. That can often lead to discussion from different perspectives or needed clarifications, ...
  • Note that in this context, by "can" I mean "can't". I need to get a keyboard that knows what I mean. Dave
  • Actually there are a number of other such spots scattered around the picture, including in the sky, at far left near the tree, and one that actually is a bird!. Normally we would suspect dust on ...
  • Replied in Utter nonsense
    I think that what Gerry an others are saying is that the perspective relationships are objectively and immutably established by the position from which  the original scene is viewed, and then ...
  • Replied in Hugin
    I have used TuFuse Pro for years, although less so in recent years. As Richard says it is capable of both exposure fusion and focus stacking, either alone or simultaneously. For more info see this ...
  • It would not be hard to find at least one YouTube video that is wrong about just about any subject you choose. Just like many other misconceptions about photographic subjects, confusion of nodal ...
  • PTGui Pro can handle bracketed exposures as input, and produce blended output using either "true" HDR or exposure fusion methods. The panorama can be output as a single, fully blended result, or a ...
  • A method called "bulb ramping" is routinely used in time lapse photography. The camera is put in Bulb mode and an electronic device opens and closes the shutter. The shutter speed is varied by the ...
  • Do some searching on "bulb ramping", an electronic control technique used in time lapse photography. It is indeed possible to control a fast shutter speed using bulb mode with electronic ...
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