Re: That's why it's called a PORTRAIT lens - or why my nose looks big.

2018-03-02 Thread Igor PDML-StR 


Jos,

You are right, optical parameters of a single eye play a role too.
But because the image we "see" is a result of the brain combining the
image from both eyes (if the binocular vision is working alright), -
both play a role.

The distance makes a difference, but when we are finding a lens
that produces an image comparable to what we see, - we are comparing
for the same FOV (which is a combination of the distance and focal length.

This page provides some information on that (although I had expected it
to be a bit more clear):
https://en.wikipedia.org/wiki/Normal_lens

Igor



 Jos de Fotograaf Fri, 02 Mar 2018 13:20:22 -0800 wrote:

I see it differently:
Also people with one eye can see perspective.
Perspective has to do with relative distance to the subject.

At the right distance for a certain perspective, you have to chose a angle 
of view for the wanted size of he subject.


Greetz, Jos



On 02-Mar-18 21:52, Igor PDML-StR wrote:



Well, it depends on how the eyes of those aliens are lined up.

The "normal" lens is "normal" for a human. (Just to remind in case someone 
here has forgotten: the normal lens provides the perspective close to that 
seen by a person.)


So, for an alien with two eyes located closer to each other then ours or even 
vertically, it will be all very different.


BTW, while my daughter was very little, just a few months old, some of the 
photos of her that I took were with Sigma 24/1.8 purchased from one of the

PDMLers. I needed a fast lens and I needed to shoot from a short distance
(usually I needed to be able to catch her or reach her with my hand.
So, some of the facial views were a bit "alien-like".


As for the original plastic surgeon, - I'd like to get his opinion on this 
photo:

http://42graphy.org/galleries/PeachCreek/_IR09965.html
and this:
http://42graphy.org/galleries/PeachCreek/_IR09963.html



Cheers!

Igor



Bruce Walker Fri, 02 Mar 2018 10:01:07 -0800 wrote:

Yep. I've been saying for ages that aliens examining our culture will
get a very distorted impression of what our faces looked like based on
modern smartphone selfies.





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Re: That's why it's called a PORTRAIT lens - or why my nose looks big.

2018-03-02 Thread Jos de Fotograaf 

I see it differently:
Also people with one eye can see perspective.
Perspective has to do with relative distance to the subject.
At the right distance for a certain perspective, you have to chose a 
angle of view for the wanted size of he subject.

Greetz, Jos


On 02-Mar-18 21:52, Igor PDML-StR wrote:


Well, it depends on how the eyes of those aliens are lined up.

The "normal" lens is "normal" for a human. (Just to remind in case 
someone here has forgotten: the normal lens provides the perspective 
close to that seen by a person.)


So, for an alien with two eyes located closer to each other then ours 
or even vertically, it will be all very different.


BTW, while my daughter was very little, just a few months old, some of 
the photos of her that I took were with Sigma 24/1.8 purchased from 
one of the

PDMLers. I needed a fast lens and I needed to shoot from a short distance
(usually I needed to be able to catch her or reach her with my hand.
So, some of the facial views were a bit "alien-like".


As for the original plastic surgeon, - I'd like to get his opinion on 
this photo:

http://42graphy.org/galleries/PeachCreek/_IR09965.html
and this:
http://42graphy.org/galleries/PeachCreek/_IR09963.html



Cheers!

Igor



 Bruce Walker Fri, 02 Mar 2018 10:01:07 -0800 wrote:

Yep. I've been saying for ages that aliens examining our culture will
get a very distorted impression of what our faces looked like based on
modern smartphone selfies.






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Re: That's why it's called a PORTRAIT lens - or why my nose looks big.

2018-03-02 Thread Igor PDML-StR 


Well, it depends on how the eyes of those aliens are lined up.

The "normal" lens is "normal" for a human. (Just to remind in case someone 
here has forgotten: the normal lens provides the perspective close to 
that seen by a person.)


So, for an alien with two eyes located closer to each other then ours or 
even vertically, it will be all very different.


BTW, while my daughter was very little, just a few months old, some of the 
photos of her that I took were with Sigma 24/1.8 purchased from one of the

PDMLers. I needed a fast lens and I needed to shoot from a short distance
(usually I needed to be able to catch her or reach her with my hand.
So, some of the facial views were a bit "alien-like".


As for the original plastic surgeon, - I'd like to get his opinion on 
this photo:

http://42graphy.org/galleries/PeachCreek/_IR09965.html
and this:
http://42graphy.org/galleries/PeachCreek/_IR09963.html



Cheers!

Igor



 Bruce Walker Fri, 02 Mar 2018 10:01:07 -0800 wrote:

Yep. I've been saying for ages that aliens examining our culture will
get a very distorted impression of what our faces looked like based on
modern smartphone selfies.



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Re: That's why it's called a PORTRAIT lens - or why my nose looks big.

2018-03-02 Thread Bruce Walker 
Yep. I've been saying for ages that aliens examining our culture will
get a very distorted impression of what our faces looked like based on
modern smartphone selfies.

On Fri, Mar 2, 2018 at 11:36 AM, Igor PDML-StR  wrote:
>
>
> This news popped up on a few science websites yesterday (I suspect due to
> Rutgers' PR department's efforts), - and I just saw it on CBS morning news
> review this morning.
>
> https://phys.org/news/2018-03-distortive-effects-short-distance-nasal.html
>
> While what they discussed is fine, they should've worked with a photographer
> and a zoom lens instead of (or in addition to the
> simulations).
>
> I believe this is well known in the photo community. (Isn't it?)
> And that's why "portrait lenses" are used for ghm... portraits (what a
> coincidence!) -- because of the most flattering angle of view/facial
> features proportions.
> But I am preaching to the choir here... ;-)
>
> Cheers,
>
> Igor
>
>
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> follow the directions.



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Re: That's why it's called a PORTRAIT lens - or why my nose looks big.

2018-03-02 Thread P. J. Alling 
Well known in the photo community is kind of an understatement. This has 
been common knowledge in photography since the late 1800s and in fact 
was explored by artists without special lenses simple mathematical 
models of perspective since the early renaissance. George Santayana was 
right.



On 3/2/2018 11:36 AM, Igor PDML-StR wrote:



This news popped up on a few science websites yesterday (I suspect due 
to Rutgers' PR department's efforts), - and I just saw it on CBS 
morning news review this morning.


https://phys.org/news/2018-03-distortive-effects-short-distance-nasal.html 



While what they discussed is fine, they should've worked with a 
photographer and a zoom lens instead of (or in addition to the

simulations).

I believe this is well known in the photo community. (Isn't it?)
And that's why "portrait lenses" are used for ghm... portraits (what a 
coincidence!) -- because of the most flattering angle of view/facial 
features proportions.

But I am preaching to the choir here... ;-)

Cheers,

Igor




--
America wasn't founded so that we could all be better.
America was founded so we could all be anything we damn well please.
- P.J. O'Rourke


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