Archived posting to the Leica Users Group, 2001/09/18

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Subject: Re: [Leica] Digital/ x ray
From: "Dan Post" <>
Date: Tue, 18 Sep 2001 09:43:12 -0400
References: <>

It seems to me that the sensor might be covered with a shield of some sort-
I refer to the old EPROMs I used to use, that were erasble with UV light-
they had a small quarts window over the eletronics.
I would have assumed that the CCD or optical sensors in cameras were in some
way protected in a simaler fashion. Most chips seem to be a die mounted into
a ceramic case, and I would like to think that a similar case would be used
with the camera chip. Perhaps Jim might shed some light on the way these are
made, since he is familiar with the 'bidness'!
- ----- Original Message -----
From: <>
To: <>
Sent: Tuesday, September 18, 2001 4:01 AM
Subject: RE: [Leica] Digital/ x ray

> Dennis Painter wrote:
> "Magnetic fields cannott affect digital storage unless it is magnetic i.e.
> floppy disks or tape or hard disks. Most digital cameras use semiconductor
> storage, not affected by magnetic fields."
> The Microdrives that most folk use in pro digicams (such as the Nikon D1)
> are tiny hard disks.
> "If dirt is a problem then don't change lenses ;-)  Likely this is a
> for
> just about any camera, the internals are going to be sensitive to dirt and
> dust."
> The pro digital SLRs I've used are *very* sensitive to dust. You change
> lens (not something that's easily avoided), dust gets into the body, finds
> its way onto the sensor surface and hence onto your images.
> The sensor is *very* difficult to clean in the field, you can try putting
> the shutter on B and spraying the sensor with air, but IME it doesn't work
> very well. Usually it's a tech job.
> At the same levels of dust and dirt a conventional camera just keeps
> In practical use, dust on the sensor is a *serious* problem.
> --
> David Morton
> "The more opinions you have, the less you see." -- Wim Wenders.
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