## SKersting66's recent activity

• The shaded area extended from the apex to the aperture area on the left represents the spread of light, and all points within it contain light from all points of the scene/source. Here I drew the ...
• Yes, kind of. The actual source would be a very small green arrow at the apex which I failed to include. The concept is very simple. Etendue has two parts, the spread of light and the collection of ...
• If the use is business/commercial then a private policy (homeowner rider) will not cover it.
• Hmm, I'm insured for "claimed value." When something happens they will either pay the current replacement cost, or the insured value (whichever is less).
• I am depicting the light from the object to the entrance pupil. I think your formula, in terms of light *recorded* is too simple. In order for there to be no loss of light the angle and area of the ...
• That is what I am depicting. The angle of acceptance of the optics (entrance pupil) which changes w/ focal length. i.e. "the solid angle that the system's entrance pupil subtends as seen from the ...
• Ok, what is the difference between angular extent w/in the FOV and geometric extent (etendue)? Perhaps I am using the term incorrectly. A is closer than C. The height/area at point A is greater, ...
• In the other thread I simply stated that changing the FL of the lens changes the etendue of the system because it changes the angle (one of) used to calculate it. Etendue simply means angular ...
• I appreciate you sticking with me on this... I'm apparently not terribly good at explaining the idea/concept, I got beat up pretty good when I first suggested etendue here a couple years ago. I ...
• By 2D I mean a simple area calculation, and by 3D I mean volume calculations. The "h" is height of the triangles, "b" is the base dimension. I probably should have used the measurements in showing ...
• Being that etendue is a qtty/volume in phase-space, I believe I have done the calculations correctly here. Due to the ISL the etendue of the source remains constant, but it's relation to the lens' ...
• The model states that with a longer FL lens it's FOV intersects closer to the source and therefore the etendue of the source *increases relative to the etendue of the lens (not sensor). My ...
• With my explanation/drawing the FOV of the source would intersect at the aperture (objective lens) if it's FOV is narrower than the diameter of the aperture. I.e. the lens' etendue/angular extent ...
• Ok, that is kind of what I was thinking... there is obviously no "matte screen," the light is traveling as an (effectively) flat wave front in order to be/remain within the FOV. However, the ...
• I believe I have in the next paragraph. The total system etendue is the qtty in phase-space made up of the two triangles. In order to manage/regulate density at the sensor plane the lens' etendue ...
• I believe they are now open to non military/vets.
• Depending on the camera/metering mode the SS will revert to the lowest possible set in the "flash shutter speed" menu item (1/60th is the fastest setting available). This is because it is trying ...
• I have tried to create a simplified graphical explanation of how everything works by creating two diagrams which illustrate the difference in etendue/light collection between two different focal ...
• I don't think there is any inherent benefit either way. Smaller pixels have a reduced full well capacity, but the light reaching the sensor is proportionally divided between more of them. However, ...
• I have a rider policy for personal gear with my homeowner's insurance company. It costs me ~ \$100/yr for every \$10k of coverage with no deductible. And it covers loss for any reason. IMO, that is ...
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 Total messages 682 Threads started 7 Last post 6 months ago
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