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General photography questions and answers: Discuss Can you use Copperhill for the mirror?...I have three very persistent dust spots and have cleaned the chamber and sensor three times. I'm beginning to think ...
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Old 21-10-2006, 09:41   #1 (permalink)
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Can you use Copperhill for the mirror?

I have three very persistent dust spots and have cleaned the chamber and sensor three times. I'm beginning to think the dust is on the mirror and wondered if you can use the same method to clean the mirror. TIA.
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Old 21-10-2006, 09:53   #2 (permalink)
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Re: Can you use Copperhill for the mirror?

I assume you mean you can see the dust spots only through your viewfinder ?
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Old 21-10-2006, 10:05   #3 (permalink)
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Re: Can you use Copperhill for the mirror?

Definitely through the viewfinder but haven't looked on a an image yet, and I have cleaned the viewfinder. I can still see them no matter which lens I use. I'll go and take a shot and see if it's on the image.
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Old 21-10-2006, 10:22   #4 (permalink)
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Re: Can you use Copperhill for the mirror?

Update - the spots do not show up on an image. I have vigorously cleaned the viewfinder but the spots are still therewhen I look through it
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Old 21-10-2006, 11:19   #5 (permalink)
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Re: Can you use Copperhill for the mirror?

Gonna be the mirror then, as dust shouldn't be able to get anywhere else that you could see through viewfinder ....I noticed a similar spec on the new camera.....must be more careful changing lenses
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Old 21-10-2006, 14:06   #6 (permalink)
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Re: Can you use Copperhill for the mirror?

Mirrors are very delicate, usually a very thin film of metal evaporated onto the glass, and very likely on the top (rather than the back) surface.

These thin films are VERY sensitive to anything touching them, so I'd recommend compressed air/blower only.

I damaged the mirror on my old OM2 by using canned air and allowing the propellent to hit the mirror when I tried to angle the tin too much.
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Old 21-10-2006, 14:34   #7 (permalink)
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Re: Can you use Copperhill for the mirror?

It's possible that the dust is on the underside of the focusing screen, rather than on the mirror. It can be tricky to get to all of this, because edges of the mirror box get in the way. IMO the easiest method is to use a very soft brush with the ferrule bent at 90 degrees so it will reach the front part of the screen.

As Dabhand says, I wouldn't use liquids on either the mirror or the focusing screen. Canon advise against this, and say you should only use a blower - unfortunately that doesn't always work.
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Old 21-10-2006, 15:38   #8 (permalink)
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Re: Can you use Copperhill for the mirror?

i would go with the brush and air (not out of a compressed can) option. The mirror is different to the sensor in that it can be cleaned whilst the camera is off and so it is not charged, therefore the dust finding it's way to the mirror should only be falling particles and hopefully will not stick to it too much so should be fairly easily done with a light brushing. This is something i used to get no-end on film cameras and have never had a problem cleaning it off with a little common sense.
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Old 21-10-2006, 17:50   #9 (permalink)
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Re: Can you use Copperhill for the mirror?

Thanks for that advice Graham, Silkstone, Lolyton
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Old 21-10-2006, 22:59   #10 (permalink)
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Re: Can you use Copperhill for the mirror?

DO NOT use compressed air!.The temperature difference between the camera and the compressed air can cause condesation on the sensor.When the condensation drys it will leave a stain.
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Old 22-10-2006, 08:12   #11 (permalink)
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Re: Can you use Copperhill for the mirror?

Apprciate that, Revive
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Old 22-10-2006, 14:04   #12 (permalink)
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Re: Can you use Copperhill for the mirror?

Aye, another problem with canned air is that the low temperature can cause thermal shock. Better to use hand-power.
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Old 24-10-2006, 18:10   #13 (permalink)
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Re: Can you use Copperhill for the mirror?

Might I suggest the use of a compressed ait cleaner BUT not the type we have mentioned thus far!

There is a sensor cleaning kit (not just for sensors, bear with me) on the market which I think is superb. it is called GreenClean and uses a tin of compressed air but instead of blowing it creates a vacuum which you then use to literally vacuum inside your camery using a highly directable tube. This system has zero danger of any propellant ever getting onto the delicate areas inside your camera.

The other important factor is that instead of simply blowing the dust around inside so that it can come straight back again, it sucks it out of there so the inside of the camera is left completely free of dust particles.

The marks mentioned at the start of this thread are definitely not on the sensor as they would show up on the pictures if they were. If they are on the mirror or on the focusing screen, they will not affect the images at all but of course are still annoying and you want to get them removed as they hinder the taking of a shot.

I totally concur with Dab about the mirror. It can take a very gentle wipe but nothing more than that and the best thing again is this GreenClean system to remove things. The absolute worst thing you can ever do is point a can of compressed air into the opening of a camera. If propellant comes out (it often does) it is freezing cold and can cause ireparable damage if it gets to sensitive electronics. At best it will leave marks on mirrirs and can, in worst case scenario, actually cause the focusing screen, which is finely ground glass, to crack.

So, keep well away from canned air but this vacuum type system works superbly. It isn't cheap but is not too bad. It's about 32 for the vacuum attachment tube and the air or about 55 with all that plus some wet and dry sensor wipes that will leave the sensor like new.

One word of caution: always use at least a blower and better this vacuum on the sensor BEFORE using any sensor wipes. If there is a grain of dirt on it when you wipe it, you can scratch the sensor cover/filter. The scratch will be so small you won't notice it with the naked eye but it will be seen on the images and the only repair is a sensor replacement.... not cheap!

Good sensor cleaning equipment is not cheap BUT consider it against the cost of having a Canon service centre do it just once (and they only use the same digiwipes and things that we use anyway!) which is about 50 and leaves you without your camera for up to two weeks and then it seems a lot more cost effective to have this system which is reuseable many times over.

Cheers,
Rob
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Old 24-10-2006, 20:28   #14 (permalink)
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Re: Can you use Copperhill for the mirror?

55..... Thanks for that Rob, I shall give it due consideration.
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