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Thank you, Jim.

 

Let's try this one:

 

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Ok - try this one.

 

What is this building, who designed it, and where is it?

 

 

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Edited by spylaw4
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Nice find indeed. I have been to that building a number of times for work reasons, below is a picture I took on a recent visit, but I had never seen that curious structure. I thought it was some kind of watch tower!

 

By the way, anyone know why I have a purple patch in the middle of the picture? I had never noticed before. (M240 probably with 28mm f2 Asph)

 

 

 

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Google "28mm Summicron hotspot" and you will find many references to that effect. My own theory is that it is primarily due to the strongly-concave next-to-last lens element acting as a mirror lens.

 

I.E. a type of flare specific to photographing on a mirror-like digital sensor, as opposed to relatively dull matte film. Light passes through lens, and produces image on sensor - image reflects off sensor back to lens - rear-most lens element(s) reflect image yet again, and if there is a strong concave )( rear surface, that focuses that light, imperfectly, as a bright spot.

 

Consider this image - incoming red rays as reflected from sensor from left, hit concave lens element, right, and bounce back to a focus. If the focus is not on the sensor, a blurred patch results. http://www.antonine-education.co.uk/Image_library/GCSE/Concave_mirror.gif

 

Especially noticeable if you have a strong light and dark tonal contrast in/near the center of the picture (e.g. dark tree and bright sky). Dark on dark produces no bright spot, and light-on-light without a dark area hides the spot. Purple color comes from coating on lens, possibly enhanced by any infra-red sensitivity ("magenta" blacks).

 

I've "acquired" nearly identical hot spots with both the 75 Summicron and 35 F/1.4 ASPH - both also have concave back glass surfaces.

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To keep things rolling on topic:

 

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Well done Andy!  You didn't waste any time!  Oh, and I have no idea where your image is!

 

I've got a shot virtually the same as Enrique's, shot from more or less the same location, but without the flare.

 

IIRC the top structure is virtually reserved for the Rothschilds and is also the "entertaining" space.

the shot was taken last Sunday from the top of No.1 Poultry

 

Here's another view:

 

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Edited by spylaw4
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