I have noticed there are several dust particles behind the lens on my 3 year old F707. One is rather large. I don't think these particles effect my pictures, but was wondering if there is a test I can do to confirm they do not. Also, is there any way to remove the dust particles? I believe the lens assemblies are sealed.
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Re: Dust Behind Lens on F707
That's odd. I had the 707 (may she rest in God's eternal peace), and never thought that dust could get behind the lens.
Do you see the dust when you look through the EVF, or when you look at the lens itself? Either way, one way to test it is to set the camera to the smallest aperture (f/8), infinity focus, and shoot a clear blue sky. Open the picture in your editor program, and see if the dust shows up.
That's a technique to use with an SLR to see if the dust inside would affect a picture, so I'm not sure if this will work with the 707.
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Unless you have a lens collimator and other equipment to ensure proper alignment when you reassemble the lens, don't even think about taking the lens apart. Take the lens to a reputable camera shop and let a qualified and properly equipped tech handle the cleaning.
If the dust is inside the lens, then you are unlucky. Canon lenses (except for a select number of the L series lenses) are not dust or weather sealed. So each time you work the zoom mechanism on a inexpensive EF 75-300mm f/4-5.6 III lens, the mechanism is working like a giant billows allowing air (and dust and moisture) to flow through the lens and camera body. Sometimes large dust particles can accumulate on the different lens elements, but it does not have any impact on the quality of the photo
If the dust is creating problem fro your picture get it fixed from service center i will suggest you should not try to open it
You will have to open up the unit by unscrewing the screws at the bottom and taking off the top cover of your PB6100.
Right behind the lens is the Lightengine ( where the dust collects )
Take off the cover of the Lightengine by unscrewing the two screws at the top of it . Then blow out the inside of the light engine with Air in a can ( available from most good PC shops )
and then reassemble.
If the dust particles still show after this ( which I doubt it will ) then you will have to take it to a Service Centre to get cleaned out as you will not be able to reassemble the lens once taken apart - it is a HUGE job !
I own several digital cameras, including the DSC-55. I have not experienced this problem with my camera.
Try two things......adjust to "low" regarding your camera's flash setting, and secondly, put a piece os scotch tape over the flash and see if this helps. Be careful not to cover your light sensor on the front of the camera's housing.
I had hoped that a few people would check their cameras and posted replies before I contacted Pentax about my dust problem, but nobody has so far. But it's interesting that someone else posted a message this morning that he has some dust inside the lens of his 550.
Anyway, this morning Pentax Canada told me that there should definitely be NO dust inside the viewfinder or the rest of the camera for that matter. Although the Viewfinder is "almost sealed" from the rest of the camera, it is not a total seal - which means to me that if dust can get into the viewfinder, it can get into the rest of the camera's interior - including the lens and imaging chip. They have asked me to bring my camera in so they can remove any dust particles that are inside.
Basically, they told me that the only place I should see any dust is inside the lens cover, which is meant only as a protective covering rather than a seal from dust. Even then, they claim that any dust on the outer lens would only enter while the camera is being used. That one I don't buy, as the lens cover is very flimsy and can easily be accidentally spread open while the camera is turned off.