On 7/4/2010 1:45 PM, Chuck Norcutt wrote:
> I forgot to mention that the 5D came back from Canon after its mirror repair
> and was only gone for 5 days total including UPS to New Jersey and back via
> FedEx.
Oh fudge! Now I suppose I have to get mine done. Now that I know it's available
per trouble, if I let it go and it
fails, I'll have no one else to blame. But I can't be sure of such quick turn
around, and we're off on some adventures
starting Friday. Foo!
> In addition to the mirror repair they say they also cleaned the sensor. The
> exterior of the camera and the eyepiece are very clean but the sensor looks
> just about as it would if I had decided it needed to be cleaned. In fact,
> one of the largest and darkest dust blobs I have ever seen on this sensor
> just suddenly appeared between test shots #2 and #3 of 3. It wasn't there on
> #1 @ f/22 or #2 @ f/16 but was there in all its glory in #3 at f/11. Oh,
> well, off to get the cleaning brush.
I suppose the repair process looses some stuff in the mirror box, and they hope
to get it all out. Who knows what the
sensor looked like post repair, pre-cleaning. Your new blob was probably just
something left hanging around from the
cleaning and knocked loose by the mirror flapping.
A few months ago, I finally tried the brush technique you recommend. Can't say
I'm wild about it. I followed the
instructions carefully. First pass went pretty well, but left some stuff.
Second pass, I seem to have somehow got some
oily stuff on the brush; must be from the mirror chamber. Anyway, it left
smears and some dust stuck to it. I did get it
cleaned up without any damage, using lintless wipes and solvent, but it was a
pain.
When processing some recent images, I had to do a fair amount of spotting (and
found a way to make 'em disappear in
uniform areas without detail). Time to clean, yuck! Yesterday, I decided to try
something everybody seems to condemn. I
took a partially used can of Dust-Off, held it vertically, both criteria so
there would be no liquid spray, and blew the
heck out of the sensor.
I thought the Rocket squeeze duster worked OK when I've tried it, but it didn't
get nearly everything and I eventually
had to try something more powerful. That's when I tried the brush. The hand
blower has nothing like the directed power
of the can.
I may have taken a risk, but I was rewarded. 50 mm, f22, the cleanest I think
it's ever been. Nothing, I mean NOTHING to
see but some very minor stuff in the farthest corners.
Next time it needs cleaning, I'll start with more careful work on the corners.
When this can gets emptier yet, I'm going
to start another one for other use, and keep one that's even safer from liquid
spray just for sensors.
Like cliff diving and playing with fire, I absolutely do not recommend this
technique to anyone else, I can't afford to
replace your sensor if you screw it up.
> ... The camera also came back with a battery installed though I had removed
> my own before shipping. ... it's clear it came from someone's test bench.
When I sent my S110 in for repair, years ago, the turn around was quick and it
came with a CF card that I didn't send in
with it. An 8MB card wasn't much use even then. ;-)
Moose
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