04-17-2015 01:24 PM
I recently sent my camera back to Canon for recalibration after I noticed all of my telephoto shots seems to be fuzzy after cropping. The results came back and they basically found nothing wrong with the camera or lens..
My question is based on the results below is there a shutter speed for taking telephoto shots where the sharpness falls off due to internal vibration of some sort?
I am also at a loss as to why mirror lockup ,(with MF) would not be the same as a shot using live view with AF.
Is there shutter movement that occurs during mirror lockup using eyeview that does not occur using LiveView AF?
(I have not performed this test at higher shutter speeds due to internal lighting issues)
I performed these tests using the following fixed points:
focal length 300
Shutter speed 1/60
No IS enabled
All shots were taken with 10 second shutter delay
Calibration target area is dead center of focus area.
Here are the tests I performed:
1.LiveView AF mode: sharp as a tack consistently
2.LiveView Quickmode: slightly less sharp but still extremely good
3.EyeView Miror Lockup,(switched to MF after allowing LiveView AF mode to find focus)
4.EyeView No MirrorLock,(switched to MF after allowing LiveView AF mode to find focus)
1.LiveView AF mode
3. Eyeview Mirror lockup
4.Eyeview NO Mirror lock
Solved! Go to Solution.
04-20-2015 02:51 PM
In live view, the second curtain of the shutter can make the shake. Mirror lockup mode you have both the first and second curtain. Normal mode you have the mirror, the first and the second curtain that can make the shake.
You have already proven with your second image that your normal AF focus correct, so the other two pictures are unsharp because of shake.
04-17-2015 03:26 PM
Honestly you need to stop shooting focus targets, and go out and start shooting real things.
04-17-2015 03:56 PM
04-17-2015 04:06 PM
Getting the best pictures requires more than just going out and shooting real things. it also requires a complete understanding of the capabilities of the camera you are using in order to get the most out of it.
And the best way to learn that is by shooting real 3 dimemnsional things.
This is the second thread you've started with photos of 2 dimensional targets.
The difference you are seeing between liveview and other photos is caused by one of two things. Either the micro focus adjustement is not correct. You wont know that unless you shoot 3 dimensional objects so you can see where the focus actually is. Or, vibration caused by mirror movement.
04-17-2015 04:50 PM
I'm confused. Does it get sharp photos when using JUST AF? Why are you using MF? Maybe it's your eye & the lack of an old fashoned focal aid such as a split prism.
Also just how stable is your tripod? When I'm doing serious testing I mount to something solid, not a tripod. Here's an example.
04-17-2015 05:19 PM
One more question. Which 300 mm lens are you using?
04-17-2015 11:02 PM
04-17-2015 11:15 PM
I'm still confused. You are shooting a mid grade lens wide open at a rather slow shutter speed using ISO 100. What are the lighting conditions? Is the lighting that bad that you feel the AF can't do it's job?
04-19-2015 08:16 AM
04-19-2015 08:32 AM
The lighting, ISO, shutter speed, Fstop, and focus used are constant in all testing modes. I also use ND filters in order to slow the shutter down. The goal was to isolate the shutter speed with a solid mount, that still shows shots that are blurry due to mechanical "noise". This is how I was able to Isolate the shutter speeds between 1/125 and 1/2. The lens is plenty sharp for determining this since it is clearly visible between a LiveView shot and a EyeView shutter shot.. Thank you.
Except there is a flaw in your thinking. Liveview still uses the shutter, so you are introducing the difference somewhere else. When you switch from AF to MF that might be enough to make the differnce you are seeing. Liveview and mirror lock up are functionally the same when it comes to taking a photo.
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