This thread certainly points up one of the advantages of film -- fresh
media for each image.
ScottGee1
On 4/14/06, Wayne S <om4t@xxxxxxxx> wrote:
> The http://www.visibledust.com/nature_of_dust.html web site has
> information on dust. There are even some electron microscope
> shots of dust. Quoting from that site:
>
> ==>
> A) Silica (SiO2) or Quartz based » high degree of hardness -
> most scratches are the result of these particles (ex: glass & sand)
>
> B) Metallic » softer in nature - not as hard as silica but may
> damage coated glass
>
> C) Fiber » usually made from synthetic materials that make
> up the fabric of our clothing - quite harmless but annoying
> (ex: pants, shirt, etc.)
>
> D) Organic & Man-Made » organic can be internal such as
> oil lubricant or external such as pollen, dead skin cells -
> man-made internal examples include foam or fabric used
> within camera chamber - also quite harmless but annoying
> <==
>
> I'm now starting to have more problems with the 5D and dust.
> Maybe it is because I'm doing more macro shots (f32 even) in
> which dust is very obvious. The CO2 duster I mentioned before
> quickly removes standard large loose dust. However, the dust
> that remains is not fibrous and may even be coming from the
> lubricants used in the camera. I don't have the visible dust brush
> so I haven't tested its effectiveness.
>
> I'm beginning to wonder if the "dust" is really oils or metal particles
> coming from the camera itself, which develops after a certain
> amount of usage. Take a look at this shot, and notice the dust
> specs in the right half of the image. (yadt - yet another dust theory)
>
> http://www.airsprite.net/OM/dust_MG_3717.jpg
> and 100% crop
> http://www.airsprite.net/OM/dustcrop_MG_3717.jpg
> shot at F32 @ 250mm
>
> This dust does not respond to air spray. Also, the size of the
> dust is not an issue at lower F stops. But for macro work it is
> becoming a real ache in the arse, a pang in the posterior,
> a prickle in the keister... what's that phrase I'm looking for?
>
> For macro work, the 5D FF sensor is probably more of a
> detriment than advantage. It is hard to realize all that resolution.
>
> WayneS
>
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