From: Paul Furman on
David Ruether wrote:
> "Robert Coe"<bob(a)1776.COM> wrote in message news:mu98569mi10a4puo7vuv1eu5c384qnighl(a)4ax.com...
>> On Wed, 28 Jul 2010 11:52:42 -0400, "David Ruether"<d_ruether(a)thotmail.com>
>> wrote:
>> : "Chris Malcolm"<cam(a)holyrood.ed.ac.uk> wrote in message
>> : news:8ba487FkkU2(a)mid.individual.net...
>> :> In rec.photo.digital David Ruether<d_ruether(a)thotmail.com> wrote:
>> :>> "Ryan McGinnis"<digicana(a)gmail.com> wrote in message
>> :>> news:4c4d0899$0$24965$c3e8da3(a)news.astraweb.com...
>
>> :>>> I love ultrawide, don't get me wrong -- but it's not some magic type of
>> :>>> lens where you can point it at anything and come out with a great photo.
>> :>>> I think photographers who are more drawn to lines and shapes and
>> :>>> symmetry tend to love ultrawide, and people who love lines and shapes
>> :>>> will find those kinds of lenses to be astoundingly intuitive to compose
>> :>>> with. But anecdotally, I've also known photographers who are less
>> :>>> interested in lines and shapes and are heavily annoyed by the necessary
>> :>>> distortion of ultrawide and thus are a bit lost in figuring out how to
>> :>>> compose a shot in ultrawide.
>
>> :>> I second this...;-) With the exception, of course, of the use of the word
>> :>> "distortion" here - I think substituting "unfamiliar perspective imaging
>> :>> characteristics" in the above is more accurate and less misleading...;-)
>> :>> There is true lens distortion (the failure of a lens to follow accurately
>> :>> the perspective type of the lens), but this is not it. Confusing the two
>> :>> does not help.
>
>> :> I've been wondering for some time how to describe that popularly
>> :> miconceived "wide angle distortion" of a wide angle rectilinear
>> :> lens. Your "unfamiliar perspective imaging characteristics" is
>> :> excellent!
>> :>
>> :> Since that "unfamiliar perspective imaging characteristic" is exactly
>> :> what would be produced by a pinhole camera with no lens at all, and
>> :> can simply be removed by moving your eye close enough to the print to
>> :> recreate the camera's angle of view, I've never liked the idea of
>> :> calling it "distortion".
>> :> --
>> :> Chris Malcolm
>
>> : Ah, I like your example for showing why super-wide rectangular
>> : perspective images are not "distorted" (accomplished by replacing
>> : familiar "reality" with the "distorted" images under the appropriate
>> : conditions and then finding no appreciable differences in the views...;-).
>> : So much of this is simply logical! ;-)
>> :
>> : Ah, a bit more to add to the above... If a "distorted" fisheye photo is
>> : projected onto a hemispherical surface and the eye is placed properly
>> : at the center of the circle at the hemisphere's rear, the view will also
>> : be undistorted, and an angle of view that is impossible to achieve with
>> : rectangular perspective can easily be achieved with the fisheye view.
>> : --DR
>
>> And a further point is that some of these perspectives aren't as unfamiliar as
>> they seem, because the human eye-brain system normalizes the image in a way
>> that a camera can't. For a simple example, put on your eyeglasses and rotate
>> your head clockwise and counter-clockwise. You will (correctly) see your
>> glasses move while the scene remains upright. But this is a bit
>> counterintuitive, since from the point of view of your eyes, it's the scene
>> that moves. That's what makes it so devilish hard to keep the horizon level
>> while looking through the viewfinder of a camera. You see the horizon as
>> level, even when the camera doesn't.
>>
>> Bob
>
> Hmmm.... If you stuck an empty picture frame out in front of you and
> did the same thing, you would see the same thing, but it's just a tilted
> frame (so what...?).

I can relate to the way he describes it. It's really hard for me to see
things objectively, even through a viewfinder, till I get home & see it
again out of context. Chimping helps... or even squinting... or just
making the effort to step back (in my mind) but it doesn't come natural.



> If you lie down on a bed and watch a big TV
> close in, the TV image will look sideways. If you lie down on the
> ground, the scenery will also look sideways (and uncorrected), but
> you know what the relationships are and that you are at 90 degrees
> from the scenery level-view. I've never had the problem you describe
> leveling a camera (either with, or without, a "real" visible horizon
> line), so the above doesn't make sense to me (but maybe I'm missing
> something, or maybe I've learned to see things as they are, and not
> "as they are supposed to be"...;-). Or, maybe you are referring to
> trying to hold level at arm's length a little digital camera using its dark
> (in daylight) rear screen (only)? Now THIS is difficult! 8^)
> --DR
>
>

From: David Ruether on

"David Ruether" <d_ruether(a)thotmail.com> wrote in message
news:i31j53$e3d$1(a)ruby.cit.cornell.edu...
> "Robert Coe" <bob(a)1776.COM> wrote in message
news:mu98569mi10a4puo7vuv1eu5c384qnighl(a)4ax.com...

>> And a further point is that some of these perspectives aren't as unfamiliar as
>> they seem, because the human eye-brain system normalizes the image in a way
>> that a camera can't. For a simple example, put on your eyeglasses and rotate
>> your head clockwise and counter-clockwise. You will (correctly) see your
>> glasses move while the scene remains upright. But this is a bit
>> counterintuitive, since from the point of view of your eyes, it's the scene
>> that moves. That's what makes it so devilish hard to keep the horizon level
>> while looking through the viewfinder of a camera. You see the horizon as
>> level, even when the camera doesn't.
>>
>> Bob

> Hmmm.... If you stuck an empty picture frame out in front of you and
> did the same thing, you would see the same thing, but it's just a tilted
> frame [or scene] (and, so what...?). If you lie down on a bed and watch a big TV close in, the TV image will look sideways. If
> you lie down on the ground, the scenery will also look sideways (and uncorrected), but
> you know what the relationships are and that you are at 90 degrees
> from the scenery level-view. I've never had the problem you describe
> leveling a camera (either with, or without, a "real" visible horizon
> line), so the above doesn't make sense to me (but maybe I'm missing
> something, or maybe I've learned to see things as they are, and not
> "as they are supposed to be"...;-). Or, maybe you are referring to
> trying to hold level at arm's length a little digital camera using its dark
> (in daylight) rear screen (only)? Now THIS is difficult! 8^)
> --DR

More...;-) I was just at the edge of a large lake with a well-defined
horizon line (with hills above), and what you ("R. C.") pointed out does
appear to be true for an angle of tilt up to around 45 to 60 degrees... ;-)
--DR


From: David Ruether on

"Paul Furman" <paul-@-edgehill.net> wrote in message
news:gpSdnVmNOMIQ6cnRnZ2dnUVZ_sadnZ2d(a)giganews.com...
> David Ruether wrote:
>> "Robert Coe"<bob(a)1776.COM> wrote in message
news:mu98569mi10a4puo7vuv1eu5c384qnighl(a)4ax.com...

>>> And a further point is that some of these perspectives aren't as unfamiliar as
>>> they seem, because the human eye-brain system normalizes the image in a way
>>> that a camera can't. For a simple example, put on your eyeglasses and rotate
>>> your head clockwise and counter-clockwise. You will (correctly) see your
>>> glasses move while the scene remains upright. But this is a bit
>>> counterintuitive, since from the point of view of your eyes, it's the scene
>>> that moves. That's what makes it so devilish hard to keep the horizon level
>>> while looking through the viewfinder of a camera. You see the horizon as
>>> level, even when the camera doesn't.
>>>
>>> Bob

>> Hmmm.... If you stuck an empty picture frame out in front of you and
>> did the same thing, you would see the same thing, but it's just a tilted
>> frame (so what...?).

> I can relate to the way he describes it. It's really hard for me to see things objectively, even through a viewfinder, till I get
> home & see it again out of context. Chimping helps... or even squinting... or just making the effort to step back (in my mind) but
> it doesn't come natural.

Ah, THAT was the value of a good, sharp, contrasty SLR viewing screen
from the old days, combined with a DOF preview button and a "high
eyepoint" VF. You could see the composition in a well-defined rectangle
within a larger field of black, with the brights/darks compositionally
exaggerated by using the DOF button to darken the VF image.
--DR


From: Robert Coe on
On Sat, 31 Jul 2010 12:41:21 -0400, "David Ruether" <d_ruether(a)thotmail.com>
wrote:
:
: "Robert Coe" <bob(a)1776.COM> wrote in message news:j2c85692dig4smg5n3h8g7qums0gcou8j0(a)4ax.com...
:
: > So far, Bowser is the only photographer in our group who has shown that he can
: > consistently produce good pictures with a fisheye. And he chooses his subjects
: > very carefully to make it happen.
: >
: > Bob
:
: Samples?

Sure, look in the Shoot-In gallery:
http://www.pbase.com/shootin/open
http://www.pbase.com/shootin/cxxx__wide
http://www.pbase.com/shootin/tubes

Bob
From: David Ruether on

"Robert Coe" <bob(a)1776.COM> wrote in message news:ti2956l08p4j96t0fj5l4iggu8i4t3pb7k(a)4ax.com...
> On Sat, 31 Jul 2010 12:41:21 -0400, "David Ruether" <d_ruether(a)thotmail.com>
> wrote:
> : "Robert Coe" <bob(a)1776.COM> wrote in message news:j2c85692dig4smg5n3h8g7qums0gcou8j0(a)4ax.com...

> : > So far, Bowser is the only photographer in our group who has shown that he can
> : > consistently produce good pictures with a fisheye. And he chooses his subjects
> : > very carefully to make it happen.
> : >
> : > Bob

> : Samples?

> Sure, look in the Shoot-In gallery:
> http://www.pbase.com/shootin/open
> http://www.pbase.com/shootin/cxxx__wide
> http://www.pbase.com/shootin/tubes
>
> Bob

Thanks. The three images nicely demonstrate how it's done! ;-)
BTW, on western trips with film, my 16mm f3.5 FF fisheye was
always THE essential lens - and the "success" rate was high. If
one knows how to fill a sky with careful framing or how to make
use of a long straight "empty" horizon line splitting blue and tan (or
other...) or knows how to integrate the curves and other WA image
parts into an aesthetically satisfying whole, fisheye shooting is easy! 8^)
--DR



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