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

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/

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?

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.
--

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

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

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

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

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

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