Discussion Forum: image blur problem

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Topic: image blur problem

Message posted by atomicmak on February-16-2006 at 12:22am

India
November-19-2005
54 Posts

was shooting since 4 months with my equipments

sigma 8mm
Nikon d100.
with infinity seting on lense

and found there is blur part finish ring of fisheye to 20 to 30 degree inwards.

blur part is like i anyone can identify that the part is not in proper focus. the middl part of image is okay.

please dont mind as i am not a professional photographer to give proper words what i mean to say in technical language.

i just need to know why it is blur on outer ring side with 20 to 30 degree inwards.

does anyone notice with their sigma ?

please guide.

-------------
Regards
mak
www.vox360.in

Message posted by Gen. Lee on February-16-2006 at 12:25am

May-15-2005
372 Posts

please post a sample image so we can see what the problem is.

General Lee

Message posted by atomicmak on February-16-2006 at 7:10am

India
November-19-2005
54 Posts

see the raw file attached. it is not good clear. if i use nikon capture or photoshop Camera Raw to enhance image proper to make tiff still it shows blur on all round edges to innerward some area.

click here to get file

-------------
Regards
mak
www.vox360.in

Message posted by smooth on February-16-2006 at 12:56pm

Australia
November-23-2002
5401 Posts

Mak,

I took a look at your .nef/raw file and noticed you are using "spot" metering this will be your issue. Using spot metering your focus range is small and most likely will alway focus at the centre of the image. You need a wider focus setting. Also a slightly higher aperture will help you out F/5.6 I personally would be using F/8.0 to F/11.0

Regards, Smooth

Message posted by atomicmak on February-20-2006 at 2:38am

India
November-19-2005
54 Posts

and what bout the spot metering off ?
can you guide on that too ?

-------------
Regards
mak
www.vox360.in

Message posted by smooth on February-20-2006 at 7:37am

Australia
November-23-2002
5401 Posts

Read the manual on how to set the metering. You want focus on all areas not just the centre spot. I do not own that model camera so I cannot offer more assistance.

Regards, Smooth

Message posted by atomicmak on February-20-2006 at 11:52am

India
November-19-2005
54 Posts

thanks i got your point and will test it soon by next session.

thanks a lot

-------------
Regards
mak
www.vox360.in

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