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PostPosted: Mon May 17, 2010 10:34 pm 
Hi,
I have an "old" sigma 400mm APO and cannot use a larger aperture than f6.
I looked at the EXIF here is what I got:
Code:
Lens:                     400mm f/5.6
Max Aperture Value:       5.7
Effective Max Aperture:   5.8
Min Focal Length :        403.2 mm
Max Focal Length :        403.2 mm

you can see the full list here : http://www.flickr.com/photos/mightychar ... 5471/meta/

I was wondering if there was something simple I could try to get the good aperture reading on my D80. Any idea beside cleaning contacts on the lens ?

thanks!


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PostPosted: Sun May 30, 2010 10:21 am 
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Location: The Netherlands
I think the 400 and 500's from sigma (the old ones anyhow) have aperture blades that can get stuck. I'm pretty sure a dealer can take it apart and relubricate the blades.

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PostPosted: Tue Jun 08, 2010 7:47 pm 
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Location: Germany
That's nothing to worry about! Does the camera show f/5.6 when you open the aperture to the max?
You can look into the lens when you set the camera to manual mode, max aperture and a long enough shutter speed to see whether the aperture blades retract fully. You can also try this with the lens detached from the body, just move the little lever on the lens-mount while some light shines into/through the lens.
It might just be that the EXIF-recording of your lens is off...
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D300+assorted lense


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PostPosted: Fri Jun 11, 2010 9:37 pm 
the camera show f6.0 max, It never went down to f5.6.

I looked into the lens using a flashlight. The lens is wide open when the camera is set to f6, the blades didn't move. I can see the blades a little bit closed with the camera at f6.3.

BTW, i found it easier to use the DOF preview button instead of a long shutter.[/quote]


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PostPosted: Fri Jun 11, 2010 9:47 pm 
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Yeah, good idea with the dof preview.
Now that you have established that the aperture blades are wide open at nominla f/5.6 just forget about the small delta in the EXIG-data.
I assume that you are quite content otherwise with this lens, aren't you?

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PostPosted: Sat Jun 19, 2010 10:44 pm 
Yes, I'm pleased with this oldie. Small, light weight, cheap, can handhold it for long period and it's sharp enough for me :)

Here is a shot i took handheld f8 1/250s iso 100. I wanted to get a feel of speed of the landing birds.
Image

or this one with the same settings
Image


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