nugat Posted March 28, 2009 Share #41 Posted March 28, 2009 Advertisement (gone after registration) Apparently the algorithms they used to "untwirl" the avatar were not 100% compatbile with the original "twirler". Interpol Untwirls a Suspected Pedophile - The Lede Blog - NYTimes.com Link to post Share on other sites More sharing options...
Advertisement Posted March 28, 2009 Posted March 28, 2009 Hi nugat, Take a look here Leica and digital corrections. I'm sure you'll find what you were looking for!
rosuna Posted March 28, 2009 Share #42 Posted March 28, 2009 Here is c/a correction. I don't see any loss of detail. This is from the top corner of a 24mm TS-E shifted all the way up. (best I recall.) The corner sharpness is not real great with this lens fully shifted but the biggest problem is c/a not sharpness. We'll see what the next model is like in 2 months. But it will be bigger and more expensive. The coloured fringe can be due to optical chromatic aberrations or other problems related to the sensor's filters. Chromatic aberrations also have effects on resolution and contrast, depending on the wavelengh of the light. Moreover, aberrations are interconnected. You cannot get an overall optimum correction if several aberrations aren't corrected. To some degree, on the other hand, some aberrations' effects mask the effects (on the picture) of other aberrations. Post-procesing can affect optical design, and expand the possibilities for many cameras, but there are limits. Link to post Share on other sites More sharing options...
AlanG Posted March 28, 2009 Share #43 Posted March 28, 2009 The coloured fringe can be due to optical chromatic aberrations or other problems related to the sensor's filters. Chromatic aberrations also have effects on resolution and contrast, depending on the wavelengh of the light. Moreover, aberrations are interconnected. You cannot get an overall optimum correction if several aberrations aren't corrected. To some degree, on the other hand, some aberrations' effects mask the effects (on the picture) of other aberrations. Post-procesing can affect optical design, and expand the possibilities for many cameras, but there are limits. All I'm trying to illustrate is that the simple act of removing the effects of c/a in software do not affect the sharpness - assuming that the lens with c/a is making a sharp image in the first place. It could be that one can make the lens sharper if the c/a is corrected optically. However my 24-105 has a lot of c/a at 24mm, but when corrected with DXO, the image is quite sharp. I have also noticed that if the c/a correction is turned up too far, colors in other parts of the image are noticeably affected. (At least in DXO - I'll try to get around to testing the same images in C-1.) Lens perfection will be hard to come by now that I am looking at 21 megapixel images at 100% on a really good large monitor. Yes Leica should make some of those R lenses for other brands if they are not going to make a FF DSLR any time soon. I thought the entire profit point in the SLR camera industry was from the selling of lenses. Link to post Share on other sites More sharing options...
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