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 No problem.
    Yup. As I did in the second response to the OP, way back up top! :-D Exactly. He is probably too much in the habit of explaining sensor area to Alfred E. Neuman. Dave
  • Replied in No problem.
    This isn't correct. You are applying the change in area , to the linear dimensions of the sensor. The change in area is indeed (25/35)² = 0.5102. But by applying that to the linear dimensions and ...
  • Using the same camera with a longer lens will always give better image quality than cropping. However, if vignetting is your concern, you'll need to study the vignetting characteristics of the lens ...
  • All variable NDs have this problem. Dave
  • Replied in Polariser fail
    It is rare that I would take issue with something Gerry said, and indeed it may be more a matter of expression. Still there is the potential for significant misunderstanding, so I'd like to ...
  • No, as is evident even in the part that you quote, not to mention that parts you excluded, I don't have that presumption; you are going all to eagerly to that conclusion. While I prefer zooms, ...
  • Well, the fact that people misunderstand the different effects of focal length and shooting position, and that it is an epiphany for many to understand the difference, belies the effect of this ...
  • As an erudite analysis of the imprecisions that can be tolerated in vernacular phrases, this is spot on. Another way of saying this is that sometimes the change in perspective resulting from ...
  • But the point here is that they are not "zooming" when they do that. Zooming stands specifically for changing the focal length of the lens, and therefore the angle of view, from a particular ...
  • Although the term "lens perspective" is sometimes used, as in this article, it is really a misnomer and is often misleading. Perspective is, by definition, the relative size and position ...
  • For what it's worth, Breakthrough Photography is working on development of a night sky filter to reduce the wavelengths associated with light pollution. They have published a spectral transmission ...
  • Nothing at all if one has a lens with a depth of field scale. Few do. Dave
  • I'd  venture to say that this would be useful in any situation where knowing the hyperfocal distance is useful. Granted, most people somehow get through life without this information. But in ...
  • Keep in mind that there are various ways to shoot waterfalls, and shutter speed is one of the creative aspects you can use in different ways; there is no particular approach that is the "right" ...
  • The first question to ask is how you want your subject to look, from the standpoint of perspective. That will be determined by where you shoot from, relative to the subject. You could be straight ...
  • Both the slide mounting to the tripod, and the camera mounting to the slide, use an Arca-Swiss type clamp and dovetail system. You would need an A-S type clamp on the tripod, and an A-S type plate ...
  • The fact that more overall detail is retained in a large print from a higher resolution sensor has nothing at all to do with depth of field . Depth of field is the range between which the focus ...
  • This is never a matter of what a printer "knows". It is a matter of the ratio of the size of the recorded image (or any element within it) and the enlarged image. We can easily "know" that; and ...
  • Of course you are. Sensors have physical size just as does film. The image recorded on the sensor is of a certain size, and just as with film, it needs to be enlarged to print size to be viewed. ...
  • Interesting; thanks Leonard. I may download it and study the manual and results of entering different variables. I'll give some thought to what he says about "Sharp Image". I do like the interface ...
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