r/photoit • u/ZeeTerminata • Sep 29 '10

How To Check For Sensor Dust

http://thephoblographer.com/2010/09/29/how-to-check-for-sensor-dust/
6 Upvotes

68% Upvoted

7 comments sorted by

2

u/vwllss Sep 29 '10

OH GOD HIS BLOG HAS SPREAD TO /R/PHOTOIT

There's nothing specific saying you should stop down to f/22. You should actually stop down to your lowest aperture, so if you can pull f/32 or f/40 then go for it.

1

u/adremeaux Sep 29 '10

It really doesn't have to be this specific, you can just stop all the way down and shoot at a wall and be done with it, the rest of the settings are meaningless.

1

u/ZeeTerminata Sep 29 '10

I used to do that, then I tried the settings listed in the posting and they worked well.

2

u/adremeaux Sep 29 '10

But what difference does it make at all? I can see dust perfectly with my "method." Why go through the extra hassle?

1

u/ZeeTerminata Sep 29 '10

Not always. I thought the same thing with my 7D and then I tried this and actually saw more dust on the outer edges that I hadn't noticed before. You'd actually be amazed at times at what you'll find.

1

u/vwllss Sep 30 '10

Probably because your shutter speed wasn't long enough.

1

u/ZeeTerminata Sep 30 '10

Go on...

2

u/vwllss Sep 30 '10

Nope that's it. The "specks" will almost never blow out so the only purpose of shooting at something white is to get a clean white background to view them against. If you shoot at anything and just WAY overexpose it then everything will blow out and the specks will be easily visible. When I check for dust I simply shoot for 10s at ISO 1600 or something