Could be a spec of dirt on the focus screen - I had that. Take the lens off
and use a blower to blow air across the screen (it's up abovethe mirror). Do
take care not to touch any of the surfaces unless it's with something
designed for the job.

John

That device is the image sensor, the 'film' part of the digital camera.
You would only need to worry about that if the speck is showing up in
your images.

Since it's showing up in your viewfinder, you can pretty much rule out
it being on the sensor. That's a good thing - I don't know about anyone
else, but the idea of having to clean that sensor (and sooner or later
I will probably have to) gives me the willies. The speck you're seeing
could be on the mirror, or on the back of the eyepiece glass, or even
on either end of your lens.

As has been suggested, it's most likely dirt on the focus screen. IME,
trying to clean it off is mostly a waste of time, and if you do get it off,
more will be along pretty soon. If it's not absolutely huge. Just try to
ignore it. Occupational hazard of owning an SLR.

Hi.

Dirty marks in the VFs of SLRs and DSLRs are fairly commonplace.

In the old days some people even used to get little bugs living inside
theirs. The dirt can not affect the image, so just leave it alone, unless it
is, or appears to be, very large.

As for Camera storage, you can cause damage by being over careful.

Sealed Poly bags are not a good idea, they can hold in moisture.

They are very usefull when your camera is in the Gadget Bag, and that is
being subjected to heavy rain for a longish time.  None of the materials
used for haversacks and camera bags are completely waterproof, as any
experienced hillwalker can tell you, so putting the cameras into thick poly
bags inside inside the Gadget Bag will protect them. This should only be
done when actually needed, and ensure the camera is not right at the bottom
of the bag, just in case a little pool develops.

Electronic devices, including cameras, should be stored in cool dry places,
a slightly draughty cupboard is Ok, but try to protect them from dust.  Do
not keep them in Kitchen, Bathroom or Bedroom cupboards.  Remember dust can
be removed, but corrosion due to internal moisture can not.

If the Camera has a built in flash, do charge it up and fire it off a few
times every month or so.  Capacitors deteriorate if not used, and if they
corrode, the Camera will be a write off.

BUT do not be overprotective of your equipment, it is meant to be used quite
heavily, and is fairly rapidly going to become worthless, due to new
arrivals.

Roy G