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03-04-2011, 04:41 AM   #1
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Dirty/noisy Viewfinder

Hi,

My Viewfinder seems to be a bit dirty, a bit as if it was noisy (the kind of noise you had on film cameras) and there is a piece of dirt on it. It is nothing really troubling, and the pictures are still ok, but do you know how I can manage to clean the inner 'mirrors' (don't know the exact name in english sorry) ?

03-04-2011, 04:48 AM   #2
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visible dust make a product called the "arctic butterfly" which is what I use for cleaning troublesome dust bunnies off my focusing screens, and my mirror box in general. And the grain you see in the focusing screen is perfectly normal - if it was completely transparent you wouldn't be able to see anything at all.
03-04-2011, 09:15 AM   #3
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If by noise you mean the circular pattern, this is the finish of the focusing screen itself and as explained by volthord is perfectly normal

as for dust, you need to remove the focusing screen and using either a blower or something like the artic butterfly clean the focusing screen and the lower surface of the prism.

DO NOT use compressed air in this area.

also, be very careful about touching anything with your hands including the brush of the artic butterfly, as it will pick up oils from your skin and put them on the surface of anything it touches.
03-05-2011, 02:52 AM   #4
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Original Poster
QuoteOriginally posted by Digitalis Quote
visible dust make a product called the "arctic butterfly" which is what I use for cleaning troublesome dust bunnies off my focusing screens, and my mirror box in general. And the grain you see in the focusing screen is perfectly normal - if it was completely transparent you wouldn't be able to see anything at all.
In fact, I realized that this was indeed grainy in taking a shot of snow. I had not realize before, and doubted it was 'new'. However, my friend had a Nikon camera and the viewfinder was less grainy, which is why I kind of convinced myself there was a problem with the camera. Unfortunately, that made me wipe it with a tissue and now I have some 'real' dirt on it (two tiny specks of dust :/).

This is fortunate you tell me about the blower or arctic butterfly, however I went to a camera specialist and he did use compressed air. I hope nothing's damaged now :/.

So well, this is no catastrophe, however, is that possible to change the upper mirror for a reasonable price (less than 50€?)? The bottom mirror seems fine.

03-05-2011, 04:38 AM   #5
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QuoteOriginally posted by volthord Quote
So well, this is no catastrophe, however, is that possible to change the upper mirror for a reasonable price (less than 50€?)? The bottom mirror seems fine
you won't have to replace any of the mirrors, all you will have to do is clean off the focusing screen and everything should be fine.

Be cautious of taking advice from users of other camera systems, because what applies to them may not apply to you. Nikon DSLR cameras tend to have brighter focusing screens with less texture on them because the majority of their users use AF. Pentax on the other hand tend to give their focusing screens a bit of texture to them so it makes manual focusing much easier...so be aware that manufacturers are using different approaches.
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