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Why isn't my computation of the actual size of an object in a photograph...
Let’s say I have a full frame camera (Sony A7) with a 50 mm lens (Canon FDn 50mm f/1.4) mounted on it. At a given object (a plane) distance I should be able to compute the size of the image in real...
View ArticleHow to scale between two white balance settings for perceptually equal...
If I have two white balance settings (say, one for direct noon sunlight, and one for full shade) and I want to create a series of interpolated settings that span between the two, what would be the...
View ArticleA problem drawing arcs associated to angles
I need to draw arcs to denote angles inside an equilateral triangle. To do this, I am using the arc function in tikz with the help of the calc package. However, if I use an automatic solution which...
View ArticleCan I calculate my phone's sensor size from f-stop, focal length, max...
This question already has an answer here: How to estimate camera sensor size? 2 answers
View ArticleHow do I interpret flashlight specs for light painting at a distance?
Context So I’ve seen light painting shots and I’d like to try it out sometime. I’m more interested in painting say parts of the landscape so they stand out during a long exposure. Question Is there any...
View ArticleDifference between focal point and distance away from object?
I have a macro lens for the camera on my phone. I want to calculate the magnification of the lens because the one i purchased does not state it. I’ve found this guide which states the mathematical...
View ArticleShow calculations to table cells
I have a table with a lot of financial data. I need to show the calculations behind each financial figure. I have considered to just use footnotes for each table cell, but I guess it’s quite ugly to...
View ArticleIn-place calculation of color with tikz and calc
Is it possible to calculate a color value like this in-place with tikz and its calc library? filldraw[fill=black!{50-95.7/2},draw=black] (1,0) rectangle (2,1); %Gives a 'Missing number, treated as...
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Using locally defined calculator commands inside tables (tabularx)
Inside a table, I want to draw rules. Their length equals the cell length times a predefined ratio (i.e. rule{ratiolinewidth}{1ex}). I use the DIVIDE{A}{B}{ratio} function of the calculator-package...
View ArticleMultiply a label by 3 and print result
I would like to create a quiz for my students where the more parts I add to the question the more points it is worth. For each extra part, I want it to be 3 more points. In the following example, I...
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