Belgrade at night, let’s talk about some things

I took this photo from the hotel I stayed in in the center of Belgrade. I just love how old these concrete block houses look, although they don’t on purpose. This is a photo, that on the first look, looks just fine. But again, I am bothered by some technicalities here.

Belgrade at night    © 2011  Christian Bock
Belgrade at night    © 2011  Christian Bock

That bright blue window in the center

So what’s going on here? I have tried to find out what that blue window is about, but on all the photos I took, I didn’t quite see anything. You can see some blue tint in other windoes as well, somaybe I shot it in the second something blue was on TV. But really, damn, it’s drawing your eye. Must. stop. looking. at. this. blue. spot.

Light pollution

How beautiful would it be if there were stars in this picture. Unfortunately, Belgrade has not started to use one type of streetlight all over the city, so you can easily use a filter to get rid of this specific wavelength. Usually, Sodium-Vapor-Lamps and specific sockets, that reflect all light to the ground are used to reduce light pollution. If you live in a big city and haven’t been out, take an onvernight trip to the countryside – you might be amazed what you are missing out due to light pollution.

Chromatic aberration

This might be the most fascinating effect you most probably never encounter with good lenses. However, this kit lens is not to be called a good lense. Different wavelengths act differently in terms of refraction.

Light refraction GNU Free Documentation License
Light refraction    © GNU Free Documentation License

This illustration shows how different colors of the light refract in different angles within the lens. This is called refractive index. The refractive index increases with decreasing wavelength. Usually, countermeasures are taken by using special coatings on the lenses, or even by software postprocessing the captured image – but in this photo’s case, all measures failed.

Did you already spot where it is most visible in the photo? if not, this crop of the area could be a hint. You can see this effect clearly with the illumated windows, having a red line on the left and a green line on the right side.

Chromatic Aberration
Chromatic Aberration    © 2011  Christian Bock

Read more about Chromatic abberation on Wikipedia.

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