CH's complaint of sensor dust in the 5D viewfinder is a big surprise to
me since I've never noticed it. I figured there has to be some so I
just checked it. There are two tiny and very black specks very sharply
in focus which are clearly on the imaging side of the focusing screen.
There are another 1/2 dozen or so very faint, light gray, out of focus
specs of similar size. These must be either on the opposite side of the
screen or on the surface of the pentaprism next to the screen. It's
actually much cleaner than my OM-2s but neither is bad enough that I'm
inspired to run off and clean them.
Perhaps, as Moose suggested, those who are complaining of dust are using
their dust blowers inside the mirror box with the mirror down. There
are probably millions of DSLR owners who now have Rocket blowers that
never had them for their SLR's. I don't do that since it's probably
guaranteed to push dust where you don't want it. But even then it's
still easy to clean off since the screen on a 5D is easily removable
just like an OM screen. If you can see viewfinder dust it can only be
on the screen or adjacent surface of the pentaprism. I do use a blower
on the first pass of sensor cleaning but then the mirror is up and no
dust can be blown into the pentaprism area... at least not easily.
I have not found dust to be a problem with the 5D. My sensor could
stand to be cleaned right now (there's a spot that's been showing up in
clouds and blue sky lately) but I've only ever cleaned it two or three
times before in 18 months of ownership.
Chuck Norcutt
Moose wrote:
> C.H.Ling wrote:
>> I still prefer the new one unless it is well over $2K, the dust on
>> viewfinder and CCD is very annoying. I have seen quite some selling ads
>> mentioned there are some dust inside the viewfinder of their 5D.
>>
> Two quite different things to me.
>
> Dust on the sensor affects the image, viewfinder dust doesn't.
>
> I wouldn't make a purchase decision based on the Canyon dust removal. It
> doesn't seem to be anywhere near as effective as Oly's system, unless
> you know of a newer and/or better test than this one.
> <http://pixinfo.com/en/articles/ccd-dust-removal/> They didn't test the
> mapping feature, though.
>
> On the other hand, I haven't found dust on the sensor of my 5D to be a
> big deal. I finally got a fair amount on there on a recent trip. Even
> so, it was only visible in a minority of the shots. Only shots with
> light colored, relatively blank spaces that are taken at smaller
> apertures show it. When I got home, a few puffs of air cleaned out all
> but one significant bit. I could see it on the sensor and blew it off too.
>
> There are still, always, I think, some small, weak specks visible at
> 100% on blue sky at smallest aperture, but they have yet to be visible
> in an actual shot I've taken.
>
> And then it only takes moments to clean it up in PS. It's nothing like
> the pain of dust on film scans.Would I like a system as effective as
> Oly's on the 5D? Sure. But it just not a big issue for me.
>
> Viewfinder dust doesn't affect the image, so being bothered by it is
> purely a personal thing. I'm sure there are people who can't stand it. I
> see some when I look for it. I don't see it when I'm using the
> viewfinder to take pictures. First time I cleaned the sensor, I also
> cleaned the viewfinder. The second time, I didn't bother.
>
> It's a snap to clean. It can only be visible when on the matte surface
> of the screen, otherwise, it's not in focus and invisible. Pull out the
> interchangeable screen, blow off (or maybe use John's goose feather
> technique.) and put it back in. Would that sensor cleaning were so easy.
>
> I suspect that a lot of viewfinder dust is a result of vigorous mirror
> box blowing pushing dust up there.
>
> Moose
>
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