Spots in my photos
Mar 1, 2018 22:00:05 #
GoofyNewfie wrote:
I think we do agree, just looking at it from a different perspective.
The image is still flipped both directions, that's just physics.
Cheers!
The image is still flipped both directions, that's just physics.
Cheers!
Do you agree that if I make a print that has a spot on its upper right, the spot will be on the lower right (as you look at it from the front of the camera) of the low pass filter or on the sensor?
Mar 1, 2018 22:49:55 #
jdedmonds wrote:
Do you agree that if I make a print that has a spot on its upper right, the spot will be on the lower right (as you look at it from the front of the camera) of the low pass filter or on the sensor?
I'm still think that a spot on the lower right in a print will be caused by dust on the upper left of the sensor. Double flip for lack of a better term. I might be wrong. I thought I was wrong once but I was mistaken.
Anyway it's an interesting discussion.Mar 1, 2018 23:36:53 #
pounder35 wrote:
I'm still think that a spot on the lower right in a print will be caused by dust on the upper left of the sensor. Double flip for lack of a better term. I might be wrong. I thought I was wrong once but I was mistaken. Anyway it's an interesting discussion.
Anyway it's an interesting discussion.Think about this: your scheme would require that the spot on the sensor or low pass filter be on the back side of the sensor/low pass filter.
Mar 2, 2018 10:40:12 #
Mar 2, 2018 11:20:08 #
jdedmonds wrote:
Think about this: your scheme would require that the spot on the sensor or low pass filter be on the back side of the sensor/low pass filter.
If that were the case how could you possibly clean it? I think we're having a little problem interpreting what each of us is saying.
Mar 2, 2018 14:37:09 #
I believe the discussion about image reversal is about this: https://en.m.wikipedia.org/wiki/Pentaprism
Mar 2, 2018 15:26:22 #
Ok. Here is the most comprehensive website I have found. Larry Lyells ,whom I met several times in the early '80's and Curt Fargo owner of Micro-Tools and is a terrific source of information on camera repair put this together. Earlier I discussed with a member about the image being flipped. This site mentions that it is a vertical flip. So if an image shows a spot on the upper left the dust will be on the lower left of the sensor. I stand corrected. Start with the introduction and work your way through the entire article.
http://www.cleaningdigitalcameras.com/
http://www.cleaningdigitalcameras.com/
Mar 3, 2018 22:03:28 #
pounder35 wrote:
Ok. Here is the most comprehensive website I have ... (show quote)
Here's the Thom Hogan quote I pledged to find, from p. 821 of his book on the D810:
"If you see dust in the upper left corner of your image, the
actual dust is in the lower left corner of the sensor as you
face it. Remember, the lens reverses up for down to the
sensor (software in the camera flips it around so you see the
image in the correct orientation."
Mar 3, 2018 22:38:02 #
PS: Until I re-read this today, I had been erroneously thinking about the sensor doing the flip; this reminded me that it's the lens that inverts the image. For some reason, that seems to constrain the movement to once only.
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