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#1
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The Lomography Petzval 58 Bokeh Control Art Lens
https://www.kickstarter.com/projects...ew-petzval-58-
bokeh-control-art-le?ref=discovery I'm a backer, love the "normal" Petzval lens and this sounds really interesting! -- Sandman |
#2
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The Lomography Petzval 58 Bokeh Control Art Lens
Sandman Wrote in message:
https://www.kickstarter.com/projects...ew-petzval-58- bokeh-control-art-le?ref=discovery I'm a backer, love the "normal" Petzval lens and this sounds really interesting! Bokeh control = fussy focus? -- Bats can't tell us apart! ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#3
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The Lomography Petzval 58 Bokeh Control Art Lens
On 1 Jun 2015 18:06:48 GMT, Sandman wrote:
https://www.kickstarter.com/projects...ew-petzval-58- bokeh-control-art-le?ref=discovery I'm a backer, love the "normal" Petzval lens and this sounds really interesting! It sucks. No Pentax mount. How do they avoid light leaks around the aperture slot? |
#4
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The Lomography Petzval 58 Bokeh Control Art Lens
Bill W wrote:
On 1 Jun 2015 18:06:48 GMT, Sandman wrote: https://www.kickstarter.com/projects...ew-petzval-58- bokeh-control-art-le?ref=discovery How do they avoid light leaks around the aperture slot? As long as there is a positive lens element behind the hole for the Waterhouse stop, then the worst you will get is a small increase in veiling flare. Peter. -- |
#5
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The Lomography Petzval 58 Bokeh Control Art Lens
In article , android wrote:
Sandman Wrote in message: Sandman: https://www.kickstarter.com/projects...y-new-petzval- 58- bokeh-control-art-le?ref=discovery I'm a backer, love the "normal" Petzval lens and this sounds really interesting! Bokeh control = fussy focus? More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon -- Sandman |
#6
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The Lomography Petzval 58 Bokeh Control Art Lens
In article ,
Sandman wrote: In article , android wrote: Sandman Wrote in message: Sandman: https://www.kickstarter.com/projects...phy-new-petzva l- 58- bokeh-control-art-le?ref=discovery I'm a backer, love the "normal" Petzval lens and this sounds really interesting! Bokeh control = fussy focus? More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon Soo... You move an element or two around to create extra spherical aberration, or something... That would translate as fussy focus control to me. https://en.wikipedia.org/wiki/Spherical_aberration -- teleportation kills |
#7
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The Lomography Petzval 58 Bokeh Control Art Lens
In article , android wrote:
I'm a backer, love the "normal" Petzval lens and this sounds really interesting! android: Bokeh control = fussy focus? Sandman: More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon Soo... You move an element or two around to create extra spherical aberration, or something... That would translate as fussy focus control to me. I read "fussy focus" to mean that it can't focus sharply in the focus plane. The "Bokeh control" affects only the out of focus parts. The Petzval lens employs an optical aberration that is called the "Petzval field curvature", which is slightly different. The Petzval lens is corrected for spherical aberrations, but introduces a field curvature instead, as well as vignetting. -- Sandman |
#8
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The Lomography Petzval 58 Bokeh Control Art Lens
In article ,
Sandman wrote: In article , android wrote: I'm a backer, love the "normal" Petzval lens and this sounds really interesting! android: Bokeh control = fussy focus? Sandman: More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon Soo... You move an element or two around to create extra spherical aberration, or something... That would translate as fussy focus control to me. I read "fussy focus" to mean that it can't focus sharply in the focus plane. The "Bokeh control" affects only the out of focus parts. Soo... You snipped a link. https://en.wikipedia.org/wiki/Spherical_aberration The Petzval lens employs an optical aberration that is called the "Petzval field curvature", which is slightly different. The Petzval lens is corrected for spherical aberrations, but introduces a field curvature instead, as well as vignetting. All lenses with the possible exemption of repro and enlarger ditto have that feature. I take that the Petzvals exaggerate that in more or less controlled manner. https://en.wikipedia.org/wiki/Petzval_field_curvature Since your into bokeh at the deep end: What's your opinion on soft focus filters? -- teleportation kills |
#9
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The Lomography Petzval 58 Bokeh Control Art Lens
In article ,
Sandman wrote: In article , android wrote: I'm a backer, love the "normal" Petzval lens and this sounds really interesting! android: Bokeh control = fussy focus? Sandman: More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon Soo... You move an element or two around to create extra spherical aberration, or something... That would translate as fussy focus control to me. I read "fussy focus" to mean that it can't focus sharply in the focus plane. The "Bokeh control" affects only the out of focus parts. Soo... You snipped a link. https://en.wikipedia.org/wiki/Spherical_aberration Edit: I also found this on nikonusa.com re that 135mm of yours: "Control the degree of spherical aberration in background or foreground elements for more creative control." http://tinyurl.com/q2jh7up /Edit The Petzval lens employs an optical aberration that is called the "Petzval field curvature", which is slightly different. The Petzval lens is corrected for spherical aberrations, but introduces a field curvature instead, as well as vignetting. All lenses with the possible exemption of repro and enlarger ditto have that feature. I take that the Petzvals exaggerate that in more or less controlled manner. https://en.wikipedia.org/wiki/Petzval_field_curvature Since your into bokeh at the deep end: What's your opinion on soft focus filters? -- teleportation kills http://tinyurl.com/androidphotography |
#10
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The Lomography Petzval 58 Bokeh Control Art Lens
In article , android wrote:
In article , Sandman: I'm a backer, love the "normal" Petzval lens and this sounds really interesting! android: Bokeh control = fussy focus? Sandman: More like more control over the things not in focus. It's probably a lot like the "Defocus Control" lenses from Nikon android: Soo... You move an element or two around to create extra spherical aberration, or something... That would translate as fussy focus control to me. Sandman: I read "fussy focus" to mean that it can't focus sharply in the focus plane. The "Bokeh control" affects only the out of focus parts. Soo... You snipped a link. I know. Sandman: The Petzval lens employs an optical aberration that is called the "Petzval field curvature", which is slightly different. The Petzval lens is corrected for spherical aberrations, but introduces a field curvature instead, as well as vignetting. All lenses with the possible exemption of repro and enlarger ditto have that feature. I take that the Petzvals exaggerate that in more or less controlled manner. Indeed. Since your into bokeh at the deep end: What's your opinion on soft focus filters? It certainly has its place. Not that it has anything to do with bokeh though. -- Sandman |
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