| Author | Thread |
|
|
06/21/2004 04:36:38 PM · #1 |
I have an Canon EOS 10D. I have experienced a problem that I can dupliate over and over.
When I shoot in Landscape mode the pictures are in focus but when I rotate the camera to Portrait mode the pictures are not focused correctly.
I thought it might be the lenses to I purchased two new Sigma DC lenses and both lenses do the same thing.
Has anyone else experienced or heard of this?
|
|
|
|
06/21/2004 04:46:29 PM · #2 |
are you using manual or auto focus? and are you refocusing on the subject after you adjust the camera's position?
James
|
|
|
|
06/21/2004 04:52:03 PM · #3 |
I am using Auto Focus and I am refocusing and recomposing each image that I take.
|
|
|
|
06/21/2004 05:05:17 PM · #4 |
What are the shutter speeds on these shots, and what focal length are you shooting at ? Are the blurry images incorrectly focused (i.e., part of the scene is in focus, just not the bit you wanted) or actually blurry (nothing sharp)
Does it happen all the time, even in bright light ?
Maybe you hold the camera less steady in portrait orientation ?
Does it happen when the camera is securely mounted on a tripod, using the timer/ cable release ?
Message edited by author 2004-06-21 17:06:53.
|
|
|
|
06/21/2004 05:18:34 PM · #5 |
When I use the 75-200 lense I use a faster shutter speed to adjust for any shake that I might have. I even placed the camera on a tripod and used the timer to take some shots of a friend. I used the center focusing point, centered her face in the frame focused and pressed the shutter. I didn't touch the camera and still the imaged required me to use an unsharpen mask in PS to correct the image. When I place the camera back in landscape mode and took the same picture I was able to go directly to my P-440 printer and print out the image and it looked fine.
|
|
|
|
06/21/2004 05:38:43 PM · #6 |
How bad is the blur? Can you show us examples?
-Danielle
|
|
|
|
06/21/2004 06:18:26 PM · #7 |
Originally posted by rsn1865:
When I use the 75-200 lense I use a faster shutter speed to adjust for any shake that I might have. I even placed the camera on a tripod and used the timer to take some shots of a friend. I used the center focusing point, centered her face in the frame focused and pressed the shutter. I didn't touch the camera and still the imaged required me to use an unsharpen mask in PS to correct the image. When I place the camera back in landscape mode and took the same picture I was able to go directly to my P-440 printer and print out the image and it looked fine. |
1. '...and pressed the shutter.' You may not get sharp images with a 70-300 when physically pressing the shutter button. I'd use a remote instead (self-timer would do as well).
2. When you take landscapes, the focus is likely infinite or close to it, with a large depth-of-field. When you take a portrait the focus (on her face) is selective, within a shallow depth-of-field (unless of course you chose a smaller aperture to achieve the opposite). Precise focusing in this scenario is critical, if you want anything at all come out sharp. This can be challenging in low light and/or with very low contrast scenes, since the camera will look for a contrast to focus on.
3. USM cannot render blurry images sharp. It can only sharpen images that come out of camera soft (unsharpened or minimally sharpened). In other words, if USM renders your final image sharp, there is no focus issue. The default sharpness setting for the 10D, at 0, is deliberately left soft. Applying sharpness via USM is generally preferred, since it offers much more control and renders very nicely.
|
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 08/03/2025 03:19:09 AM EDT.
