[OM] Re: YADT, 5D - Dust at various apertures

[John Hermanson]

There's atleast one Canon model where techs have discovered dust BEHIND 
the low pass filter.
___________________________________
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743
631-424-2121 | Olympus OM Service since 1977
http://www.zuiko.com  |  omtech1 AT verizon.net


Wayne S wrote:
> Ok, here is an update of dust correlated with F stop with 5D.
> After several cleanings with PecPad wrapped on credit card
> cut to size, there were a few spots that refuse to change.
> Here are some 100% crops around those spots:
> 
> http://www.airsprite.net/5D_dust/dust_32.jpg F32
> http://www.airsprite.net/5D_dust/dust_22.jpg F22
> http://www.airsprite.net/5D_dust/dust_16.jpg F16
> http://www.airsprite.net/5D_dust/dust_11.jpg F11
> http://www.airsprite.net/5D_dust/dust_8.jpg  F8
> http://www.airsprite.net/5D_dust/dust_5_6.jpg  F5.6
> 
> You can see that the spot is evident at F16, starts to disappear
> at F11 and nearly invisible at F8. I did not enhance the contrast.
> 
> Almost all the spots could be cleaned with PecPad plus
> alcohol, except a few.
> 
> WayneS
> 



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