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Re: [OM] Large sensor schmutz--Please stat page Dr. Sensor Cleaner

Subject: Re: [OM] Large sensor schmutz--Please stat page Dr. Sensor Cleaner
From: John Hermanson <omtech1@xxxxxxxxxxx>
Date: Mon, 23 Aug 2010 11:13:17 -0400
Canon users may already know that some low pass filters were coated with 
tin oxide, an extremely soft coating.  5D is one of them.  Tin oxide 
does not like eclipse or eclipse 2.  Gentle cleaning (with eclipse) was 
often the start of trying to remove a spot which in reality was a small 
dot of tin oxide that had already been damaged.  Repeated cleaning made 
the dot bigger as more coating was rubbed off.

Methanol is now the cleaner of choice for many shops, avoiding Eclipse 
and Eclipse 2.  Hard cleaning with an air jet has shown to sometimes 
blow dust between low pass filter and sensor.

___________________________________
John Hermanson  |   CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121  |  www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html

On 8/22/2010 11:53 PM, Moose wrote:
> On 8/22/2010 8:15 PM, usher99@xxxxxxx wrote:
>> What is the best way to clean this?  I think Moose finally  had to
>> clean his 5D sensor and just used a blower IIRC.  I can't find his
>> post.
> ------------------------------------  7/4/10 "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. "
> --------------------------------------
>
> I've also used a SensorPen, by the LensPen folks. It actually worked
> pretty well, though I felt a bit insecure wiping the business end
> around on the sensor. As with the other techniques and tools I've
> used, there were multiple cycles of clean, shoot test, clean,
> repeat.
>
> Nothing I've done before has come close to the results of the
> ostensibly 'high-wire without a net' act with the mostly empty can of
> Dust-Off. One treatment, test shot shows all done.
>
>
>> Is this one better than most?
>> http://www.bhphotovideo.com/c/product/541904-REG/Giottos_AA1903_Rocket_Air_Blower_.html
>
>>
> That's the brand I have. If you're really in a rush, an ear syringe
> from any pharmacy blows rather well, just doesn't have the valves to
> suck air in through the back.
>
>> I recall Chuck's use of the Swiffer after vacuuming the end to
>> remove loose particles.  He posted a step by step a few years ago,
>> but couldn't find it.
>
> I'm under the impression he has moved on to the brush technique.
> Maybe he uses both? If wiping the sensor directly, to get something
> stuck off, I would try the SensorPen before going the Swiffer route.
>
>> I believe he also mentioned Eclipse. I fear this big whatever may
>> be too large to clone out of some images.
>
> If it's really big, I think it's more likely to be something light,
> and thus easily blown out with air.
>
> Moose
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