Torgian Posted February 11, 2015 Share #1 Posted February 11, 2015 Advertisement (gone after registration) A few days ago I was photographing my friend. While editing the photos, I noticed these two pictures and the difference in the bokeh. The first is shot at F 1.5, and the second at F 4. This is the first time I noticed this, but at F4 the lights have the star pattern. Personally I dislike this, but I found the comparison interesting enough to post about it. I don't know if other lenses produce similar results at F4. I'm looking through photos that I have taken int he past with my 35mm zeiss, but haven't found anything similar yet. Anyone else with this lens have a similar experience? What about with other lenses? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/240957-zeiss-50mm-f-15-bokeh-shots/?do=findComment&comment=2762903'>More sharing options...
Advertisement Posted February 11, 2015 Posted February 11, 2015 Hi Torgian, Take a look here Zeiss 50mm f 1.5 bokeh shots. I'm sure you'll find what you were looking for!
Lenshacker Posted February 11, 2015 Share #2 Posted February 11, 2015 I wrote an article for Theme on the C-Sonnar, put forward my explanation for the star-shaped aperture, The aperture of the C-Sonnar is shaped to offset focus shift produced by spherical aberration. The aperture mechanism of the original Sonnars stops down in a traditional circular pattern. The 1950s Carl Zeiss Sonnar stops down using a star-like pattern. This “counter-intuitive” shape lessens the effects of stopping down on focus shift: light from the inner and outer portion of the star-like shape contribute to the image, extending the depth of field and reducing focus shift. The modern C-Sonnar uses the star-like pattern of the 1950s Sonnar. In actual practice, the circular aperture produces smoother bokeh but does produce a more dramatic shift in focus and contrast when stopping down from F1.5 to F4. Read more: Lesson in History: The Magic of the “Value for Money” Zeiss C-Sonnar 50mm F1.5 | THEME I believe the Original 5cm F1.5 Xenon, the Summar, and some Summitars used a hexagonal shaped aperture for the same reason. A circular aperture is the worst possible shape for focus-shift, and the best possible shape for pleasing Bokeh. Conservation of Inconvenience, one of the basic laws of life. I end up using the classic 1930s Sonnars, with the circular aperture blades. The later "T" lenses come very close to the performance of the C-Sonnar, even wide-open. http://www.the.me/unique-blend-of-compactness-super-speed-and-perfect-imperfections-1930s-sonnar-lenses-on-the-leica-m9-and-m-monochrom/ Link to post Share on other sites More sharing options...
edwardkaraa Posted February 11, 2015 Share #3 Posted February 11, 2015 I personally love the star shaped aperture effect on blurdiscs, as seen with the C-Sonnar and sometimes in movies using classic lenses. Link to post Share on other sites More sharing options...
Torgian Posted February 11, 2015 Author Share #4 Posted February 11, 2015 That's a pretty cool explanation about it. Link to post Share on other sites More sharing options...
2wk Posted February 11, 2015 Share #5 Posted February 11, 2015 50 Summilux asph is similar as well. Link to post Share on other sites More sharing options...
Hannes Lummes Posted February 11, 2015 Share #6 Posted February 11, 2015 ...and certainly not to avoid focus shift. Link to post Share on other sites More sharing options...
billo101 Posted February 11, 2015 Share #7 Posted February 11, 2015 Advertisement (gone after registration) 50 Summilux asph is similar as well. It is true. b Link to post Share on other sites More sharing options...
Lenshacker Posted February 11, 2015 Share #8 Posted February 11, 2015 Once you back off a bit, F4 calms down quickly. Pilot's Day 2014, Udvar Hazy C-Sonnar ar F4, Orange filter. This is with a Sonnar/J-3 Hybrid, made from 6 parts lenses- picked through a lot of front elements for this look. It has round aperture, fixture from a 1937 Sonnar. F1.5, Hybrid J-3/Sonnar F4: Hybrid J-3/Sonnar Big change in focus, contrast, and even color rendition. But smooth Bokeh at F4. Link to post Share on other sites More sharing options...
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