Timeline for What swirly bokeh technique is this and how can I achieve it?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 29, 2016 at 20:58 | comment | added | user49351 | Is it possible to achieve that homemade swirly effect with a 24mm used on a cropped sensor (EOS 50D) ? | |
| Jul 31, 2015 at 7:02 | vote | accept | pradeep sekar | ||
| Jul 6, 2015 at 4:31 | comment | added | Brandon Dube | @thomasrutter Petzval is a specific optical feature - if a lens has zero astigmatism but uncorrected field curvature, the true image plane is known as the Petzval Surface. To calculate it, one uses the relationship that T-P = 3(S-P) where T is the tangential focal plane, P is the petzval surface, and S is the sagittal focal plane. | |
| Jul 6, 2015 at 4:17 | comment | added | thomasrutter | I have seen this effect called everything from "field curvature" to "crazy swirling bokeh" before but have never heard the term petzval before. Thanks for introducing me to a new term. | |
| Jul 4, 2015 at 17:58 | comment | added | Michael C | Is it just me, or does the photo appear to have been shot centered on the model (at approximately her belly) and then the right side and bottom cropped to make the petzval effect off center? | |
| Jul 4, 2015 at 16:17 | comment | added | Brandon Dube | Petzval is not unique to petzval lenses =) Vignetting is also there in all camera lenses to some degree. Astigmatism will cause a difference between the tangential and sagittal planes, so you may bokeh with a quasi-anamorphic look, but it is not the same. | |
| Jul 4, 2015 at 16:14 | comment | added | Blrfl | How does this happen on non-Petzval designs? | |
| Jul 4, 2015 at 15:37 | history | answered | Brandon Dube | CC BY-SA 3.0 |
