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10-10-2009, 07:25 PM   #1
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Just another cleaning/dust-locating question...

Since I don't know... I have to ask you guys. So at the risk of being seen as a complete idiot, here goes:

When I look through the viewfinder on my camera, I see dust. Where is it? On the mirror? On the rear lens element (facing the camera body)?

It just bothers me and I'd like to know what I need to do to get it off. I've blown-off both the rear element of the lens and the inside of the camera body, with a Giotto's Q-ball. I just need to know where it is, since I am seeing it through the viewfinder, and what the next steps are to get a clear view again...

I believe I have sensor dust, too- as I am seeing spots (that don't match up with the dust I see through the viewfinder) on test photos at small apertures.

Please let me know what you think.

10-10-2009, 08:52 PM   #2
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If you see it in the viewfinder, it's on the focusing screen.
If you see it on your pictures, it's on the sensor.
Dust will not be visible as discreet objects if it's anywhere else.
10-11-2009, 07:32 PM   #3
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Original Poster
Another question.

Thank you very much, Wheatfield! Makes perfect sense- but I'm just learning about focusing screens anyway (manual focus is difficult!), so I guess I didn't even think about that. I looked up info on cleaning the focusing screen, and that seems to be quite a job to take on. I am weighing whether it's really worth doing.

Does dust on the focusing screen cause any issues with autofocus?
10-12-2009, 12:21 AM   #4
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No. The AF takes light from the mirror to work. Dust on the focusing screen is an annoyance, but it isn't going to weak havoc with anything other than your sanity.
I take a pretty easy going approach to this.
Dust happens.

10-12-2009, 12:42 AM   #5
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QuoteOriginally posted by Wheatfield Quote
No. The AF takes light from the mirror to work. Dust on the focusing screen is an annoyance, but it isn't going to weak havoc with anything other than your sanity.
I take a pretty easy going approach to this.
Dust happens.
It's a healthy habit that I fully agree upon.

If I see any dust in the viewfinder, I attack it with a hand blower. Not compressed air since that stuff, worst case, can destroy the mechanics inside the camera. I use a small rubber bulb that I squeeze to blow air. That will do away with most of the big particles. The rest I just ignore.
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