Pay particular attention to the "filter test". I managed to buy a pair
of cosmetic mask brushes from ebay for less than $10 including shipping
(couldn't find them locally despite going to a beauty shop supply store)
Since I had gotten mask brushes instead of the much more common
artists brushes (which need the sizing washed out) I thought I could
skip the washing and filter test. Good thing I didn't.
The filter test showed that the brushes actually contained quite a bit
of an extremely fine, flour-like powder that was not visible just by
examining the brush. Washing the brushes in a mild soap solution and
rinsing thoroughly took care of the problem as evidenced by a repeat of
the filter test. I assume that the powder was some sort of residue from
the manufacturing process.
Since my brushes were only 5/8" wide, I swiped the brush down one side
of the sensor, flipped the brush over and did a return swipe down the
other side. Did the same thing with the second brush. Before I started
there were about 30 dust particles visible. After both brushes had each
gotten their two swipes there were only two largish dust spots left.
Neither shows up below f/16 so those two have been allowed to stay for a
while.
Chuck Norcutt
Winsor Crosby wrote:
> That is a great article. Thanks for the link.
>
>
>
> Winsor
> Long Beach, California, USA
>
>
>
>
> On Mar 21, 2007, at 10:14 AM, Chuck Norcutt wrote:
>
>> And my experience with the 5D is that an air bulb is almost, although
>> not completely, useless. Brushes, however, do work wonders.
>> <http://www.prime-junta.net/pont/How_to/a_Brush_Your_Sensor/
>> a_Brush_Your_Sensor.pdf>
>
>
>
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