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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 05 Sep 2014 (Friday) 09:59
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New Sigma 150-600 Sport

 
BigAl007
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Jan 29, 2016 18:45 as a reply to  @ post 17877554 |  #721

I have yet to try to set up the MFA on my 150-600C, again it is the lack of decent weather and the fact that you really need to be outside to run the tests that I haven't got around to it yet. I got the dock for christmas. I have not really got involved in doing MFA before now, I have generally been happy with the focus on my 50D. Having read up on the Dot Tune method that is what I will be employing, simply because it requires no assessment of the image sharpness of images by the photographer. I also use Magic Lantern on my camera and this allows you to run the Dot Tune method for MFA automatically.

What I plan to do is setup at each of the focus distances in turn and then run the ML Dottune program for each zoom setting. I'll note the required MFA setting for each, and then use the dock to zero out the in camera setting. Hopefully the relationship between the MFA steps in the Sigma program will have a linear relationship to those in the Canon body, even if they are not 1:1 so it shouldn't I hope take too many runs to get the required results.

Alan


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skid00skid00
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Jan 30, 2016 14:18 |  #722

reelly1 wrote in post #17876837 (external link)
I SUCK at trying to calibrate the lens. I wish I had a friend who close by that I could just hand it off to ha! I have messed with and messed with it. Maybe its just my eyes, I can never tell where it falls. ANy ideas of the best focusing chart? Of course I got it and as luck would have it its been raining and cloudy every day since! SO I am in inside my shop trying to get it, maybe ill just put it up until sun comes out and i can get outside with high shutter speeds and low ISO. I even made a target and 45 degree scale beside it.

Set up a tripod, and a large white sheet of paper/cardboard 100 ft away - IN THE SUNLIGHT. Put one 1/4" wide black cross in the center of the paper.

Focus on the cross using LIVEVIEW. Look at the distance scale on the lens. Then switch to phase detect (non-liveview) and focus. See where the lens distance scale moved. Adjust AFMA. That'll get you close. It's all I use now, and my focus is perfect.




  
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reelly1
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Jan 30, 2016 14:52 |  #723

Both of those are great ideas! I got frustrated and spent the money on FoCal Pro. Lets see where that gets me. Of coarse we finally had some sunshine but the wind was blowing about 30. Be a few days before have the time to devote to to it again.


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Cooltigers
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Post edited over 3 years ago by Cooltigers.
     
Feb 09, 2017 01:45 |  #724

is this pic properly focused
guys please comment


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Feb 14, 2017 07:02 |  #725

Cooltigers wrote in post #18268462 (external link)
is this pic properly focused
guys please comment
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Hosted photo: posted by Cooltigers in
./showthread.php?p=182​68462&i=i239794495
forum: Canon EF and EF-S Lenses

How much of a crop was that from the original? What was the actual focal length? I suspect something on the wide end given the 5.6 av. Looks a little soft, but that may be a product of the shutter speed, which unless you were tracking really well, was to low for BIF in my opinion.


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BigAl007
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Feb 14, 2017 11:26 |  #726

Cooltigers wrote in post #18268462 (external link)
is this pic properly focused
guys please comment
thumbnail
Hosted photo: posted by Cooltigers in
./showthread.php?p=182​68462&i=i239794495
forum: Canon EF and EF-S Lenses


I have a slight suspicion that the angle the bird is approaching you at is such that the angular velocity relative to the camera for each wing tip is slightly different. usually I would not think it would be much of an issue for birds, it can be quite bad for aircraft when shooting at slow shutter speeds to maintain prop blur. Still there seem to be some points that are perfectly sharp. I would have thought that 1/1600s on a large bird that seems to be gliding, and not flapping the wings, would be fast enough, even at 600mm. It does look as though it is a big crop, and has mentioned f/5.6 would imply wider than 600mm.

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Cooltigers
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Feb 14, 2017 22:42 as a reply to  @ BigAl007's post |  #727

thanks for comments ,it is a big crop and was a awkword angle actually i wanted to know if the lens requires afma or not
thanks for technical views
l could always use a little guidance




  
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BigAl007
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Feb 16, 2017 10:57 |  #728

Cooltigers wrote in post #18274006 (external link)
thanks for comments ,it is a big crop and was a awkword angle actually i wanted to know if the lens requires afma or not
thanks for technical views
l could always use a little guidance


I wouldn't have thought so, it seems to me as if the focus is where it needs to be.

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Cooltigers
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Feb 17, 2017 00:56 as a reply to  @ BigAl007's post |  #729

thanks wil be posting some shots soon




  
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May 08, 2017 18:46 as a reply to  @ Cooltigers's post |  #730

You can't tell anything about how well it focuses (especially AFMA needs) when you're shooting a moving target.


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Nov 25, 2017 13:09 |  #731


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Nov 25, 2017 13:17 |  #732

Cooltigers wrote in post #18274006 (external link)
.. i wanted to know if the lens requires afma or not...

We would not be able to judge with this example. The lliklihood of getting perfect focus in this condition relying on hardware is small. (angle, velocity, flickering lights off the water as background which wreaks havoc on AI servo AF, etc.)

You did a great job in a tricky situation getting this image!

If you would like to check for the need for MFA, check out any of a number of youtube tutorials on the subject. You'll need to be tripod mounted, with the right target at the right angle etc.


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New Sigma 150-600 Sport
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