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Thread started 07 May 2009 (Thursday) 14:41
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Focus Screen Cleaning

 
Karl ­ C
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May 07, 2009 14:41 |  #1

Anyone have advice for cleaning the focusing screen on a 5D? I did a Google search and there's conflicting advice. Some say don't do it; others say it's okay. I am aware of the 5D recall and can go that route.

What started as a few specks is now much worse after I used a rocket blower and cleaning it with a lens cloth.

Aside from saying, "live with it", any ideas/suggestions?

Thanks


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captclick
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May 07, 2009 14:54 |  #2

If it's just dust you can try a rocket blower. I tried to clean my MKIII and ended up buying a new one. It is very easy to scratch and or smudge.


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Lowner
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May 07, 2009 15:16 as a reply to  @ captclick's post |  #3

A couple of years ago I cleaned the focus screen on an EO3-3 and ended up having to replace it because I managed to scratch it. Before that I'd done the same on a Nikon FE and lived with it until I finally sold it.

It can be done, but they are VERY soft plastic and so VERY easy to damage. Air is good, anything solid and I'm certainly not the right person to be wielding the implement. I find it harder than cleaning the sensor.


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Karl ­ C
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May 07, 2009 15:58 as a reply to  @ Lowner's post |  #4

Thanks for the feedback. I'll keep working on it with the rocket blower. Worse comes to worse, I'll send it to Canon repair or buy a new screen.


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RDKirk
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May 08, 2009 09:15 as a reply to  @ Karl C's post |  #5

I would not do more beyond blowing than rinsing with distilled water and allowing it to air dry, then blow again. I would not touch it with any solid implement.




  
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JeffreyG
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May 08, 2009 11:06 |  #6

I've found that taking it out of the body and giving it a good blow off usually works.


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Karl ­ C
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May 08, 2009 13:50 as a reply to  @ JeffreyG's post |  #7

The rocket blower made things worse (go figure). Anyway, I'm sending it to Canon for the main mirror detachment service bulletin (it's not broken) and it'll get cleaned by them.

Thanks


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gjl711
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May 08, 2009 14:07 |  #8

JeffreyG wrote in post #7882550 (external link)
I've found that taking it out of the body and giving it a good blow off usually works.

This is all I have ever done. However, I use to clean the ground glass viewer on an old speed graphic, a front surface mirror of a video copy box, and the frosted glass display panel of the same box with a mixture of water and dish soap gently rubbing with just my wet finger. Then rinse with distilled water and let it air dry while held vertically. Works very well.


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Focus Screen Cleaning
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