I'm starting to do more macro work with my 5D, in which high F-stops are common. At high F-stops, dust becomes more in focus, while at lower F-stops is not visible (below F11-16). Here is a macro shot I made yesterday at F32 using 180mm macro plus 1.4x converter. Notice the dust on the right.
http://www.airsprite.net/OM/dust_MG_3717.jpg 100% crop of right side: http://www.airsprite.net/OM/dustcrop_MG_3717.jpg This dust is not affected by using a CO2 duster, so I'm beginning to wonder if the origin of the dust is from the camera itself, such as lubricants. The visible dust website http://www.visibledust.com/nature_of_dust.html mentions the possibility of metal or lubricants from the camera itself. I'm wondering if this becomes more of an issue the more the camera is used. Not that the small size of the particles become nearly invisible at F8 and below, so may not be noticed much by many photographers. Only when high F-stops are used does it become a problem. I have not used a visible-dust brush, but only a PecPad and my own plastic utensil (made from stiff bubble pack plastic) and a couple of drops of methanol to clean this. I'm open to suggestions on how to deal with this problem. I'm beginning to think the 5D is not the ideal camera for macro work, and that a 20D or 30D would be a better choice. WayneS * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
