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Улыбнули.
smiled
чем снимали я понял...
.....
а снимок то, где?
Es ist eine coole Linse auf Edixa - Schneider Xenar, suche es jetzt für die Sammlung, und Sie gewählt Helios TIP))) Bitte dieses Experiment die letzte? Ich glaube, das ist ein Super-Teleobjektiv, 500-700mm?)))
Thank you, Denis. The focal length was incredible 2 km... Shortly after this shot, all the equipment items were sold... The experiment can not be repeated.
Wow, was there any light left?!!
No..! But that doesn't matter, because the diffraction would form pixels, which are bigger in diameter then the 24x36 film image...
Thank you, Wahid
Bernd Ratfisch:
the diffraction would form pixels, which are bigger in diameter then the 24x36 film image...
Sorry, that my answer didn't come at once. I had to read some physical guide and formula books again...
The resolution of a lens by diffraction is often messured in "Lines per Millimeter". The Helios-44 lens will at f:1/2 have a resolution of approximately 750 Lines per Millimeter. Theoretically. If you square the "Lines per Millimeter", you get a circle, the "Diffraction Circle". This circle is the smallest picture unit, it's a what the digital world calls "pixel"...
The resolution by diffraction gets lower, when the aperture is closed or the aperture is small. The Helios-44 lens will theorecically at f:1/16 have a resolution by diffraction of approximately 100 Lines per Millimeter.
(The resolution by diffraction differs on the wavelength of the light. That's why all resolutions are "approximately". if the wavelength is not defined...)
My Edixa Experiment used a lens system with the aperture f:1/73728. This results to a resolution of 0,02 Lines per Millimeter. So - you need 50mm for 1 line! The 35mm-film picture size 24x36mm has a diameter of 43,27mm. This is smaller than 1 pixel by this Edixa Experiment lens. That's why you will just see nothing as a result.
By the way: 1 pixel would have the size of 25 cm²... Do you know the size of a pixel in your digital camera?
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Edixa Experiment lens has more practical disadvantages: You might know, that a 1:1 macro size uses a distance between the object and the picture plane of four times the focal length. A focal length of about 2 Kilometers means: You need a distance of 8 Kilometers to get a 1:1 macro size. It means: The horizon is in a macro distance for this lens system! The earth is too small for this construction...
Bernd Ratfisch:
... Do you know the size of a pixel in your digital camera?
I liked your elaborate comment.
Внушительно смотрица.
Nice try
Ох, ничего себе, какая ценность!:))