While using a smooth backdrop you will never see swirl. Even when using it wide open.
You will only see it when the background has a certain pattern or outside when there is a background with leaves or so.
While using a smooth backdrop you will never see swirl. Even when using it wide open.
You will only see it when the background has a certain pattern or outside when there is a background with leaves or so.
"You dont take a picture, it's given to you"
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Pere Casals, beautiful picture!!! It is intriguing how come that the lens could focus on the girl and also on the bushes that seem to be half the distance. Otherwise it illustrates the rule of 1/3 of focal length being sharp at image centre.
My point at the opening of this thread was, in different words, that if you focus on the lens axis you get a circle of sharpness, but if you focus on a peripheral point, in theory, you get not a circle but a ring of sharpness, due to the field curvature. But I don't know whether this is a noticeable effect on the final picture. I will definitely do some tests.
There is a swing, if you observe the plants that are just at left and right of the girl you see that at left plants are out of focus, while at right are sharper. The plane of focus (sphere of focus in this case ) passes by the plants in the left-bottom corner and by the girl.
Also there is some tilt (I think), as girl is more out of focus near feet.
Also I feel that placing the swirl in the right place is powerful...
It looks magics, some "pixel lovers" would have said that a good photoshop work was there !
I also like it because what is in the back of the girl it is OOF, what she can see in front of his face it is sharp. It suggests me some kind of subject self awareness, just a personal impression.
https://www.flickr.com/photos/vitali...cPv5Y3-cB6piA/
LF is great ! I love it !!!
I tested it. The attached images show a portrait made with a Derogy Rapide nº4, Petzval type, 223 mm focal length, fully opened, serial number 40022. I used FP4 9x12 cm. First of them I just kept the lens axis centred on film while for the second I shifted lens 2 cm to the left and tilted film and lens board, backwards, in order to get the equivalent to 3 cm lens fall. In both cases I focused the eyes using a loupe. It confirms that there is a noticeable effect of aberrations acting upon the overall impression of sharpness on the off center parts of the image. We can focus on a peripheral part of image and compensate field curvature but this does not correct aberrations that will always be there. When lens axis points to the spot we where we want the best image quality, then we get the best performance the lens can yield. The only way to improve those portions far from center in regards to aberrations is stopping down the lens, as Scott did in his above posted portrait.
Portrait:
Eyes with lens axis pointing to film center:
Eyes with lens axis pointing to subject's eyes:
thankfully the only petzval lenses i have used were
a focal length longer than my format and i never got the swirls
they give me a headache and nausea ..
I think yes.. the bottom or long side of the pix will go progressively crazy out of focus - because of the physics of the curve of the lens
might be cool though
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