CCD Check

hower · 4th August 2005

I think I should start a new thread regarding this.

Just wish to know how to check if there is dust on the CCD. Anyone can share a good method?

Is there a thread already started on this topic? Cannot find any.

TMC · 4th August 2005

set f/22 and shoot a white or really light colored background.

This has been discussed before but why not again.

hower · 4th August 2005

You mean any focal length lens will do. Just shoot at f22 at a white background (white piece of paper will do I guess).

What am I suppose to look for?

Originally Posted by TMC

set f/22 and shoot a white or really light colored background.

This has been discussed before but why not again.

TMC · 4th August 2005

yesh. any lens will do.

if you shoot a totally white piece of paper you should b e looking out for grey spots on it. try it and you will understand.

hower · 4th August 2005

Okay, correct me if I am wrong.

Any grey spot in the photo will mean there is dust on the CCD, am I right?

Originally Posted by TMC

yesh. any lens will do.

if you shoot a totally white piece of paper you should b e looking out for grey spots on it. try it and you will understand.

TMC · 4th August 2005

yesh. since it is supposed to be totally white. Any spots will show up prominently. simple.

2 places where you will find dust that affects your image, lens and sensor. So if you take the picture will a lens that you have just cleaned, most likely the dust is on the sensor.

hower · 4th August 2005

Thanks, that is simple.

jumbocrab · 4th August 2005

After taking the picture, load it in photoshop and select "auto level". The dust will show up clearly.

hower · 4th August 2005

Are you referring to the same method that TMC had taught me?

Originally Posted by jumbocrab

After taking the picture, load it in photoshop and select "auto level". The dust will show up clearly.

jumbocrab · 4th August 2005

Yes, take the picture as he described. To see the dust spots much more clearly, load it up using photoshop and select auto levels.

hower · 4th August 2005

Thanks. I think someone should write an article to share this info to everyone. It will be really useful.

Originally Posted by jumbocrab

Yes, take the picture as he described. To see the dust spots much more clearly, load it up using photoshop and select auto levels.

4th August 2005	#1
hower Member Join Date: Apr 2003 Location: Singapore & Shanghai Posts: 662	CCD Check I think I should start a new thread regarding this. Just wish to know how to check if there is dust on the CCD. Anyone can share a good method? Is there a thread already started on this topic? Cannot find any.

4th August 2005	#2
TMC Senior Member Join Date: Sep 2004 Location: Beyond Space-Time Continuum Posts: 5,921	set f/22 and shoot a white or really light colored background. This has been discussed before but why not again. __________________ Selling: 32GB Thumbdrive - Patriot Xporter XT 120sgd (Price reduced)

4th August 2005	#4
TMC Senior Member Join Date: Sep 2004 Location: Beyond Space-Time Continuum Posts: 5,921	yesh. any lens will do. if you shoot a totally white piece of paper you should b e looking out for grey spots on it. try it and you will understand. __________________ Selling: 32GB Thumbdrive - Patriot Xporter XT 120sgd (Price reduced)

4th August 2005	#6
TMC Senior Member Join Date: Sep 2004 Location: Beyond Space-Time Continuum Posts: 5,921	yesh. since it is supposed to be totally white. Any spots will show up prominently. simple. 2 places where you will find dust that affects your image, lens and sensor. So if you take the picture will a lens that you have just cleaned, most likely the dust is on the sensor. __________________ Selling: 32GB Thumbdrive - Patriot Xporter XT 120sgd (Price reduced)

4th August 2005	#8
jumbocrab Member Join Date: Jun 2004 Posts: 410	After taking the picture, load it in photoshop and select "auto level". The dust will show up clearly.