Focussing

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weardalered

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Name
Clive
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I seem to be having a crisis of focussing. Its either my eyes or the camera or neither/both!

Although my images appear sharp they are not pin sharp. ie sharp enough to cut.

So, I though of sending it to AJ Johnstone in Glasgow for a once over.

Has anyone used them and has opinions, good or bad?

Otherwise, is there a test that I can do to check whether the camera has focussing issues?

TIA
 
There are ways of doing it.

Download a focus chart like this one: LINK.

and focus on the centre line with the largest aperture. This will work for macro lenses and the like. I use a fence for the others picking a specific panel. Use a tripod and remote to negate that possible part of the issue. Focus using auto focus and then try it manually focusing.

The chart needs to be at an angle to the plane of the camera so that the 1,2,3 get further away/nearer.
 
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I've gone dizzy just looking at it!

Thanks will try this out tonight.
 
weardalered said:
I seem to be having a crisis of focussing. Its either my eyes or the camera or neither/both!

Although my images appear sharp they are not pin sharp. ie sharp enough to cut.

So, I though of sending it to AJ Johnstone in Glasgow for a once over.

Has anyone used them and has opinions, good or bad?

Otherwise, is there a test that I can do to check whether the camera has focussing issues?

TIA
Click to expand...

You can use the focus chart as cowasaki has give you the link to see if the lens/camera is out of alignment, and if you find it's front/back focusing you will have to send your lens in for alignment to the maker's or send both the camera and lens for adjustment's, as the D2x has no Mico Ajustment in the camera..;)

What lens is it?
 
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I suppose I should try this with different lenses as well.

That will rule out or not that I have a lens issue
 
cowasaki said:
There are ways of doing it.

Download a focus chart like this one: LINK.

The chart needs to be at an angle to the plane of the camera so that the 1,2,3 get further away/nearer.
Click to expand...

Around 45 degree's will do, if you lay the chart on a flat surface and camera on a tripod, set your camera approx' 45 degree's pointing down to the focus chart..
 
weardalered said:
I suppose I should try this with different lenses as well.

That will rule out or not that I have a lens issue
Click to expand...

Yes;)
as it might only be the one lens that is OOF/OOA which means you only have to have that one sorted out.:)
 
All my lenses are sigma.

I beleive that images directly from the camera are a little soft, but I am just not sure and to be honest I don't know why I am thinking that there may be a problem.

I thought that if I sent the body in for an MOT they would be able to see if there was a problem.
 
if you are shooting in raw then all images from the camera will be soft until you've sharpened them.
 
trencheel303 said:
if you are shooting in raw then all images from the camera will be soft until you've sharpened them.
Click to expand...

Yes I am and I understand this. But there just seems to be something else going on and I can't nail it.

Perhaps it's just me becoming overreactive at what I am seeing.

Perhaps it's a mid-camera crisis :)
 
OK, so here are the results. No processing has been done on any of the pictures. They have just been converted form RAW to a JPEG.

Distance from the test chart was maintained so the depth of field will vary as the 24-60 is an f2.8 and the other is not.

http://www.talkphotography.co.uk/gallery/showphoto.php?photo=93338&ppuser=27281

http://www.talkphotography.co.uk/gallery/showphoto.php?photo=93339&ppuser=27281

http://www.talkphotography.co.uk/gallery/showphoto.php?photo=93337&ppuser=27281

http://www.talkphotography.co.uk/gallery/showphoto.php?photo=93336&ppuser=27281

As far as I can tell all is well with the focussing on the camera.

However this is how I started the thread so it may still be my eyes :)
 
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Actually this may not be true.

The 24-60 autofocus image looks as though it is in focus more in front of the focal point than behind.

The manual focus seems OK though.

Perhaps I will send the lens back to Sigma
 
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