Forums: Skydiving Disciplines: Photography and Video:
Odd Canon Problem

 


Premier faulknerwn  (D 17441)
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Jan 14, 2012, 12:49 PM
Post #1 of 7 (750 views)
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Odd Canon Problem Can't Post

I have a Canon T1i with a 10-22 lens. I've had this for a couple of years, always shooting in TV mode. Recently the pictures I take in TV mode are always coming out washed out, but if I put it in Sports mode they come out fine.

I've tried speeds of 1/400-1/640 with no difference. Tried with/without UV/Polarizer lenses. No difference.

Moving the exposure compensation down a couple of notches helps a little but its still washed out. I've got Auto ISO, currently on Auto White Balance (though I used to use cloudy). Setting is Standard, Ai Servo, Evalutative metering, continuous shooting. AF Point selection is automatic.

I'm out of ideas on why it suddenly started overexposing in TV mode but being fine in Sports Mode. I just hate trying to take landing shots in sports mode because its hard to get it to focus..

This is what the Inspector says for a good shot in Sports Mode:

Aperture Value: 5
Color Space: sRGB
Components Configuration: 1, 2, 3, 0
Custom Rendered: Normal process
Date Time Digitized: 2012:01:14 13:20:17
Date Time Original: 2012:01:14 13:20:17
Exif Version: 2.2.1
Exposure Bias Value: 0
Exposure Mode: Auto exposure
Exposure Program: Action program
Exposure Time: 1 / 499
Flash: Flash did not fire, compulsory flash mode
FlashPix Version: 1.0
FNumber: 5.6
Focal Length: 15
Focal Plane Resolution Unit: inches
Focal Plane X Resolution: 5,315.436
Focal Plane Y Resolution: 5,342.327
ISO Speed Ratings: 100
Max Aperture Value: 4
Metering Mode: Pattern
Pixel X Dimension: 4,752
Pixel Y Dimension: 3,168
Scene Capture Type: Standard
Shutter Speed Value: 9
Sub-second Time: 11
Sub-second Time Digitized: 11
Sub-second Time Original: 11
White Balance: Auto white balance
AFInfo: 0.2227294, 0.473139, 0.02691947, 0.05372191, f, 0.3287687, 0.5858497, 0.02691947, 0.05372191, f, 0.3287687, 0.3604284, 0.02691947, 0.05372191, f, 0.4810393, 0.6932935, 0.03792135, 0.03686798, f, 0.4765918, 0.4650632, 0.04681648, 0.06987359, F, 0.4810393, 0.2698385, 0.03792135, 0.03686798, f, 0.6443118, 0.5858497, 0.02691947, 0.05372191, f, 0.6443118, 0.3604284, 0.02691947, 0.05372191, f, 0.7503511, 0.473139, 0.02691947, 0.05372191, F
Firmware: Firmware Version 1.1.0
Flash Compensation: 0
Focus Mode: 1
ImageStabilization: 3
Lens ID: 235
Lens Info: 10, 22, 0, 0
Lens Model: Canon EF-S 10-22mm f/3.5-4.5 USM
Serial Number: 620,103,638

This is what inspector says for an overexposed shot in TV mode.

Aperture Value: 5.375
Color Space: sRGB
Components Configuration: 1, 2, 3, 0
Custom Rendered: Normal process
Date Time Digitized: 2012:01:14 09:48:10
Date Time Original: 2012:01:14 09:48:10
Exif Version: 2.2.1
Exposure Bias Value: 0
Exposure Mode: Auto exposure
Exposure Program: Shutter priority
Exposure Time: 1 / 499
Flash: Flash did not fire, compulsory flash mode
FlashPix Version: 1.0
FNumber: 6.3
Focal Length: 15
Focal Plane Resolution Unit: inches
Focal Plane X Resolution: 5,315.436
Focal Plane Y Resolution: 5,342.327
ISO Speed Ratings: 100
Max Aperture Value: 4
Metering Mode: Pattern
Pixel X Dimension: 4,752
Pixel Y Dimension: 3,168
Scene Capture Type: Standard
Shutter Speed Value: 8.625
Sub-second Time: 05
Sub-second Time Digitized: 05
Sub-second Time Original: 05
White Balance: Auto white balance
AFInfo: 0.2227294, 0.473139, 0.02691947, 0.05372191, f, 0.3287687, 0.5858497, 0.02691947, 0.05372191, f, 0.3287687, 0.3604284, 0.02691947, 0.05372191, f, 0.4810393, 0.6932935, 0.03792135, 0.03686798, f, 0.4765918, 0.4650632, 0.04681648, 0.06987359, F, 0.4810393, 0.2698385, 0.03792135, 0.03686798, f, 0.6443118, 0.5858497, 0.02691947, 0.05372191, f, 0.6443118, 0.3604284, 0.02691947, 0.05372191, f, 0.7503511, 0.473139, 0.02691947, 0.05372191, F
Firmware: Firmware Version 1.1.0
Flash Compensation: 0
Focus Mode: 1
ImageStabilization: 3
Lens ID: 235
Lens Info: 10, 22, 0, 0
Lens Model: Canon EF-S 10-22mm f/3.5-4.5 USM
Serial Number: 620,103,638


I'm out of ideas. Anyone have any?


dragon2  (D 101989)

Jan 15, 2012, 1:54 AM
Post #2 of 7 (695 views)
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Re: [faulknerwn] Odd Canon Problem [In reply to] Can't Post

I've had cameras unintentionally overexpose for 2 reasons:

1) Using the remote or turning on the camera inside the (darkish) plane before getting out, and setting the camera to fix the exposure on a "half shutter click". This setting is what you'd normally use to re-compose a shot for groundwork, however it doesn't work so well in the air Crazy
This issue also depends on how your remote is wired - will the camera keep metering and focussing when it is turned on, or wil it only start doing that when you use the remote.

You can see this is happening because the reported aperture in your overexposed pictures will be too high (ie, 2.8 on a sunny day).

Solution: don't set your camera this way.

2) The camera THINKS it is setting the right aperture for the picture, but the aperture in the lens gets "stuck".
In this case the reported aperture of an overexposed picture will be correct, however the camera clearly used a different aperture than stated.
You can see if you have this problem by switching out lenses and cameras. Does the same lens plus a different camera have the same issue? And visa versa?

Solution for this problem: you probably have to buy a new lens ...


Premier faulknerwn  (D 17441)
Moderator
Jan 15, 2012, 5:49 AM
Post #3 of 7 (683 views)
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Re: [dragon2] Odd Canon Problem [In reply to] Can't Post

Laugh, solution for your second problem would be just shooting in sports mode. Save $700.

The camera is turned on in the plane like it always has been. Like I said, whatever is going on only started a couple of months ago.

I'm using the standard conceptus bite switch. I'm not sure how it's wired but I'm not using anything non-standard.


Premier DSE  (D 29060)

Jan 15, 2012, 9:10 AM
Post #4 of 7 (661 views)
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Re: [faulknerwn] Odd Canon Problem [In reply to] Can't Post

In reply to:
I have a Canon T1i with a 10-22 lens. I've had this for a couple of years, always shooting in TV mode. Recently the pictures I take in TV mode are always coming out washed out, but if I put it in Sports mode they come out fine.

I've tried speeds of 1/400-1/640 with no difference. Tried with/without UV/Polarizer lenses. No difference.

Moving the exposure compensation down a couple of notches helps a little but its still washed out. I've got Auto ISO, currently on Auto White Balance (though I used to use cloudy). Setting is Standard, Ai Servo, Evalutative metering, continuous shooting. AF Point selection is automatic.

I'm out of ideas on why it suddenly started overexposing in TV mode but being fine in Sports Mode. I just hate trying to take landing shots in sports mode because its hard to get it to focus..

This is what the Inspector says for a good shot in Sports Mode:

Aperture Value: 5
Exposure Time: 1 / 499
Flash: Flash did not fire, compulsory flash mode
FNumber: 5.6
ISO Speed Ratings: 100
Metering Mode: Pattern

This is what inspector says for an overexposed shot in TV mode.
Aperture Value: 5.375
Exposure Time: 1 / 499
FNumber: 6.3
ISO Speed Ratings: 100
Metering Mode: Pattern
All things being equal except the aperture being smaller, I can see the confusion.
stopped down a half stop shouldn't be washing out the photos; they should have less exposure/darker even with the increased AV value.
Have you tried clearing all settings?


Premier faulknerwn  (D 17441)
Moderator
Jan 15, 2012, 11:11 AM
Post #5 of 7 (637 views)
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Re: [DSE] Odd Canon Problem [In reply to] Can't Post

I may have fixed the problem. We were poking around trying to fix the problem this morning and one thing I did was take the lens off. Last batch of pictures came out fine. So maybe there was dust or something on one of the sensors connecting the lens to the camera?


Premier DSE  (D 29060)

Jan 15, 2012, 4:28 PM
Post #6 of 7 (612 views)
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Re: [faulknerwn] Odd Canon Problem [In reply to] Can't Post

Gently cleaning the contacts with a white pencil eraser, or swab with alcohol is a good thing to do from time to time. Coulda just been dirt or other poor contact. I feel dumb for not suggesting that.


velocityphoto  (D 18988)

Jan 15, 2012, 7:00 PM
Post #7 of 7 (596 views)
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Re: [faulknerwn] Odd Canon Problem [In reply to] Can't Post

Another thing to do is cover the back side of the camera view finder. You will sometimes get a blown out shot or dark image as well due to the sun shinning in the view finder.



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