dsjtecserv

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

dsjtecserv's recent activity

  • I think its important to note that all of the above assumes that the picture is framed in the same way for both sensor sizes. That means that for the crop sensor, a shorter focal length is needed, ...
  • Exactly. But that doesn't make it a matter of semantics. Rather it means that depth of field is a dynamic phenomenon affected not just by the conditions under which the image was captured, but ...
  • The image as recorded on the sensor (and represented by ones and zeros in a file) hasn't changed. But that image has no depth of field until it is produced in a perceptible form, such as a print. ...
  • Hyperfocal distance is also a function of sensor size, as represented by the circle of confusion, c in the equation: H = f + (f^2)/Nc where: H is the hyperfocal distance, mm f is the lens focal ...
  • Glad it worked so well for you. It really is a very powerful and versatile program; my picture "live" within it when not being processed in Photoshop. Dave
  • OK, we weren't clear that you want to preserve the whole image, but add padding to the short dimensions.  That's a different task. You want to make the long side exactly 2000 pixels while ...
  • As Mark B notes you are really asking the program to crop your images to a specific dimension. Since the best crop location of each of the images may or may not be the same, Mark suggests that you ...
  • That not really true. Any initial investment in Photoshop would have been previously amortized. The ongoing expense with the perpetual license versions was the the upgrades, which cost about $200 ...
  • You are exactly correct -- if the print size is larger (and the view distance stays the same) then the depth of field would be less. Since it would be impossible to predict the ultimate print size ...
  • Replied in Sensor size?
    I won't presume to speak for him, but I suspect it doesn't matter. Since he is trying to optimize the size of the blur circle on the sensor itself produced by the interplay of defocus and ...
  • I missed the discussion that you linked back to, but it looks like what I was exploring with a spreadsheet a while back. I put that aside under the demands of time, but when I get a chance I'll ...
  • If it was your intent to demonstrate that, you did not succeed. The image from the D5100 has less depth of field, because was enlarged more to be displayed at the same size on the screen, as it ...
  • Actually, the first scenario given by GB is exactly what the OP asked: same focal length and shooting distance, relative aperture (aka f-number); with the printed output sized proportional to the ...
  • Google "Canon 5D pattern noise". Dave
  • But then we get into the paradox that adding "maximum" to either supposed synonym creates the opposite meaning! A "maximum shutter speed" makes sense (even though it really isn't speed), but ...
  • This isn't distortion at all, it is the very real result of viewing scene from a particular spot. The change in distance changes the perceived size relationships between near and far objects, when ...
  • More advanced panorama programs have the ability to read differences in brightness and equalize the tonal levels to create a seamless (or nearly so) transition, even if the images were not shot ...
  • This is fundamentally incorrect. The perspective of the scene, which includes "compression", is solely a function of the viewing distance. This is true whether or not a camera is involved at all. ...
  • But by moving back, the picture won't be the same. The perspective will be different. But if a lens of a shorter focal length (proportional to the crop factor) is used with the crop camera from ...
  • Yes, you do. And like for like includes both pictures need to be printed at the same size and viewed at the same distance. In order to print the image from the smaller sensor to the same size, it ...
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