Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
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5

This reply to @Caleb's comment kept growing and growing into an off-topic answer. Maybe you still find it useful. After mounting the zoom ring gear, I'll attach a pinion gear to the stepper motor shaft to control the motion of the zoom ring. A linear zoom throw allows for smooth, consistent zooming that doesn't draw attention to itself. ...


4

This isn't just one company creating their own buzz, and corresponding buzzword, for marketing purposes. This has been an important advance in optics in general over the last 15-20 years. The technology is still in its early phases, where there is a lot of proprietary knowledge being closely held by the companies that develop this. I suspect it will be ...


0

See this thread at dpreview.com. Several people have posted there that they have the same problem with the J1 using the 10-30mm. Nikon issued a service advisory to correct/repair a design flaw with that lens.


1

My guess, without more info is that you have accidently changed your camera's mode to 'manual'. Press the 'Menu' button, then click 'Exposue Mode' using the control dial. Next choose 'P' for program mode and press the Menu button. The camera should now take pics normally. As an aside, the 10-30 lens has free update available to correct a focus problem if you ...


0

What do the various lines mean? What are the axes? The source we all quote on how to read an MTF chart is Michael Reichmann's article at Luminous Landscape. Most of the following information is cribbed from that article. However, keep in mind that these particular conventions only apply to Canon MTF charts. Other lens makers may have different ways to ...


0

Light from a distant subject enters the lens as bundles of parallel rays of light. We can mount devices that intercept and thus modify the image formatting rays before they enter the camera lens. These devices are called supplementary lens systems. As an example, an ordinary wide-angle front door peephole lens array can be mounted before the camera, and this ...


2

Can I clamp these iPhone lenses onto these M12 lenses? Will they work? They'll probably work to some degree. I've taken pictures with an iPhone by holding the lens up near the viewfinder of a DSLR, the objective of a microscope, and the eyepiece of a telescope. All worked better than I'd hoped, but it's more like using sunglasses in front of a digital ...


1

if it is possible to view a number of scenes stereographically after the lens distortion is removed from them Yes. In theory all distortion correction does is undo some distortion a lens introduces because it is not an ideal ( theoretcally perfect ) lens. You will note this distortion is radially symmetrical and the effect is most notable in the ...


5

No, these are unrelated. Distortion removal is a 2D mapping which moves pixels to remove barrel and pincushion distortion. Parallax correction requires multiple images or depth information for each pixel and is performed by completely different software algorithms.


10

Does anyone know if this software uses the Brown-Conrady model to achieve the lens correction? Yes they do use those very common camera calibration coefficients. I added some copyable text versions of the formulas to the following quote: Adobe Camera Model Geometric Distortion Model for Rectilinear Lenses xd = (1 + k1*r^2 + k2*r^4 + ...


3

I can't speak specifically about LR, but many raw processing applications don't use one of several generic mathematical models (such as Brown-Conrady) that are based on an assumption of rotational symmetry at all if the lens used is a fairly popular one. Instead they use a calibrated correction profile to correct for the measured distortion of the lens at ...



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