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Position of dust on sensor VS computer screen



 
 
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  #1  
Old June 15th 07, 10:52 PM posted to rec.photo.digital.slr-systems
Celcius
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Posts: 529
Default Position of dust on sensor VS computer screen

Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2 bits
still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


  #2  
Old June 15th 07, 11:30 PM posted to rec.photo.digital.slr-systems
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Posts: 330
Default Position of dust on sensor VS computer screen


"Celcius" wrote in message
...
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2 bits
still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


bottom right.


  #3  
Old June 15th 07, 11:37 PM posted to rec.photo.digital.slr-systems
Mike Coon
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Posts: 77
Default Position of dust on sensor VS computer screen

Celcius wrote:
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2
bits still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


No, the light comes down from the upper left of scene, through the centre of
the lens and to the lower right as seen from behind the camera or lower left
looking into the front of the camera towards the sensor.

Mike.
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  #4  
Old June 16th 07, 01:34 AM posted to rec.photo.digital.slr-systems
Colin_D[_2_]
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Posts: 218
Default Position of dust on sensor VS computer screen

Celcius wrote:
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2 bits
still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


The image on the sensor is upside down with respect to the subject, and
is rotated 180 for viewing, so spots at upper left on the image
originated at the bottom right of the sensor.


Colin D.

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  #5  
Old June 16th 07, 12:11 PM posted to rec.photo.digital.slr-systems
Celcius
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Posts: 529
Default Position of dust on sensor VS computer screen


"Celcius" wrote in message
...
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2 bits
still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


I guess it's bottom right.
Thanks all!
Marcel


  #6  
Old June 16th 07, 02:20 PM posted to rec.photo.digital.slr-systems
John Sheehy
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Posts: 878
Default Position of dust on sensor VS computer screen

"Celcius" wrote in
:


"Celcius" wrote in message
...
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2
bits still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


I guess it's bottom right.


No; it's not. All the answers thus far are incorrect.

When you look into the front of the camera, left and right are not reversed
from the image on the review LCD or computer monitor, because you swapped
them when you rotated the camera 180 degrees.

The specks are in the lower left, looking into the front of the camera.

You can verify this with a lens and a sheet of paper in a dark room,
pointed at a bright window with a silouhette in one corner.

--


John P Sheehy

  #7  
Old June 16th 07, 02:37 PM posted to rec.photo.digital.slr-systems
Celcius
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Posts: 529
Default Position of dust on sensor VS computer screen


"John Sheehy" wrote in message
...
"Celcius" wrote in
:


"Celcius" wrote in message
...
Hi everyone!
I cleaned the sensor on my Canon 30D. After downloading the photo, 2
bits still appear on the upper left corner of my computer screen.
Where is that dust located on the sensor? Upper right corner? Thanks.
Marcel


I guess it's bottom right.


No; it's not. All the answers thus far are incorrect.

When you look into the front of the camera, left and right are not
reversed
from the image on the review LCD or computer monitor, because you swapped
them when you rotated the camera 180 degrees.

The specks are in the lower left, looking into the front of the camera.

You can verify this with a lens and a sheet of paper in a dark room,
pointed at a bright window with a silouhette in one corner.

--

John,
Is "looking in the front of the camera", the same as looking at the sensor?
In other words, what you're saying is that the speck of dust which shows on
the upper left corner of my computer screen is actually on the lower left
corner of my sensor?
Thanks for taking the time. I was dobtful and now, I'm completely lost ;-)))
Marcel


  #8  
Old June 16th 07, 02:39 PM posted to rec.photo.digital.slr-systems
Adrian Boliston
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Posts: 308
Default Position of dust on sensor VS computer screen

"John Sheehy" wrote in message
...

The specks are in the lower left, looking into the front of the camera.


I guess the people who replied meant to say that the dust is in the bottom
right *when looking at the camera from the rear*. The only trouble with
this is that you would not be able to see the sensor (to clean it) without
the aid of a mirror ;-)


  #9  
Old June 16th 07, 03:04 PM posted to rec.photo.digital.slr-systems
Celcius
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Posts: 529
Default Position of dust on sensor VS computer screen


"Adrian Boliston" wrote in message
...
"John Sheehy" wrote in message
...

The specks are in the lower left, looking into the front of the camera.


I guess the people who replied meant to say that the dust is in the bottom
right *when looking at the camera from the rear*. The only trouble with
this is that you would not be able to see the sensor (to clean it) without
the aid of a mirror ;-)

Adrian,
So far, I get: "look(ing) into the front of the camera..." , "when looking
at the camera from the rear"... I'm confused... very confused ;-)
Please, when looking at the sensor to clean it, then where? Thanks
Marcel


  #10  
Old June 16th 07, 05:12 PM posted to rec.photo.digital.slr-systems
Bill Funk
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Posts: 2,500
Default Position of dust on sensor VS computer screen

On Sat, 16 Jun 2007 10:04:01 -0400, "Celcius"
wrote:


"Adrian Boliston" wrote in message
...
"John Sheehy" wrote in message
...

The specks are in the lower left, looking into the front of the camera.


I guess the people who replied meant to say that the dust is in the bottom
right *when looking at the camera from the rear*. The only trouble with
this is that you would not be able to see the sensor (to clean it) without
the aid of a mirror ;-)

Adrian,
So far, I get: "look(ing) into the front of the camera..." , "when looking
at the camera from the rear"... I'm confused... very confused ;-)
Please, when looking at the sensor to clean it, then where? Thanks
Marcel


It's in the bottom left, as you look at the sensor to clean it.
The lens both inverts and reverses the image on the sensor; as you
look at the sensor *from the front*, you're reversing it again, but
not inverting it.
Imagine this: use a piece of frosted glass, and see the image from the
lens from behind the glass; this is how the sensor sees the image from
the lens: upside down, and left for right. If you now move in front of
the glass, the image is still upside down, but it's not left for right
anymore.
Easy. :-)

--
THIS IS A SIG LINE; NOT TO BE TAKEN SERIOUSLY!

Hillary Clinton gave a high school commencement
speech at Constitution Hall in Washington D.C.
on Wednesday. She loves speaking at school
graduations. Normally when she tells people
how they should live, they are not required
to sit still for it.
 




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