Technical Question
Dec 24, 2019 17:38:14 #
cbtsam wrote:
I found myself going to shoot xmas lights with the... (show quote)
This is a very exciting capture because it strikes out is uniqueness. This may not be the effect you were looking for but it is very festive and exciting!
All things are not the same. Now I don't want to get to o technical But the reason for this effect is simple. Namely, each bulb of the light is pointed in different directions relative to the camera's lens. Since the you are nearer to the lights, when focused, some will look spherical. Those bulbs on the perimeter will be ovoid. That is the first effect. If you were further away, the lights would be more uniform. The second effect is from the lens's elements. These elements are predominately convex in design. That is why they magnify images. They are thicker in the middle and thinner on the outskirts of the lens. This will cause a "bowing" effect and the bulbs on the ends will look distorted and create this effect.
Now that the science (optical) lesson is concluded, I would like to offer my complements. You may have hoped that the Bokeh would be uniform. But because of its uniqueness, no one else can duplicate that work of art. Get ready to print it and hang on a wall in a gallery.
Happy Shooting!
Dec 24, 2019 20:18:00 #
I would speculate this phenomenon is the result of the optical characteristics of this particular lens - distorted bokeh.
Dec 24, 2019 23:39:37 #
As the view goes off-axis, the
sensor sees the exit pupil at
an ever increasing angle. At
wider apertures the edge of
the front element will "shave"
the edge of the exit pupil. So
you have two effects together
causing the elliptical images:
https://photo.stackexchange.com/questions/34160/clipped-bokeh-circles-at-max-aperture-with-wide-aperture-short-focal-length-len
No need to read all 45 pages
in the link below. Pages 31 to
34 is where you'll see images
that explain your question:
https://lenspire.zeiss.com/photo/app/uploads/2018/04/Article-Bokeh-2010-EN.pdf
sensor sees the exit pupil at
an ever increasing angle. At
wider apertures the edge of
the front element will "shave"
the edge of the exit pupil. So
you have two effects together
causing the elliptical images:
https://photo.stackexchange.com/questions/34160/clipped-bokeh-circles-at-max-aperture-with-wide-aperture-short-focal-length-len
No need to read all 45 pages
in the link below. Pages 31 to
34 is where you'll see images
that explain your question:
https://lenspire.zeiss.com/photo/app/uploads/2018/04/Article-Bokeh-2010-EN.pdf
Dec 25, 2019 10:10:30 #
User ID wrote:
As the view goes off-axis, the br sensor sees the ... (show quote)
By George, I think you've got it! Thanks so much.
Dec 25, 2019 10:11:54 #
Scruples wrote:
This is a very exciting capture because it strikes... (show quote)
Thanks for your very kind evaluation of the image.
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