55 mm tube and dust????

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV filter and a cap. I planned to put it on the 602 and keep it there to protect lens. Now, after I saw it and imagined how it would be nice to have lens covered and protected I have a question. The filter and tube connected to the camera would create a air tight chamber. When the camera lens is extracted it will fill the space inside the tube originally filled with air. Now air should go somewhere. It will be squeezed through the camera insides out of this chamber. When the camera turned OFF the effect will be opposite the air will be sucked into the camera, through the camera and finally into the tube. This will happened every time the camera is turned ON and OFF. This process will force the outside air with dust through the camera. There is no special channels for in the camera for the air flow that means it should find the way though the camera. It may flow around CCD and other parts which may be lubricated.. This may cause the dust on CCD and everywhere inside. I really feel to drill few very small halls through the tube to prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

Hi Leo,

Well...... that one has been around the block a time or two here on the forum
Any info is there for the "search" ing

Bottom line seems to be "don't worry about it" and don't drill holes.

But be sure and read them for yourself, it's good reading anyway.

Happy New Year

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

The air in the adapter tube moves into the space vacated by the lens (on deployment) and the air in the camera moves into the adapter tube into the space vacated by the lens (on retraction). No air moves into or out of the camera.
Jay Leo

Jay Leo said:

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

Click to expand...

The air in the adapter tube moves into the space vacated by the lens (on deployment) and the air in the camera moves into the adapter tube into the space vacated by the lens (on retraction). No air moves into or out of the camera and tube assembly.
Jay Leo

If it makes you happy to drill a couple of holes... do it! That way if you ever have a dust problem, you won't be thinking "I should have drilled some holes!" It certainly won't hurt anything... just remember to remove the tube from the camera before you drill the holes! (smile!)

How do you plan to keep dust from entering through the holes? Some HEPA filter material? (another smile!)

Edward

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

Edward Casati said:

If it makes you happy to drill a couple of holes... do it! That way
if you ever have a dust problem, you won't be thinking "I should
have drilled some holes!" It certainly won't hurt anything... just
remember to remove the tube from the camera before you drill the
holes! (smile!)

How do you plan to keep dust from entering through the holes? Some
HEPA filter material? (another smile!)

Click to expand...

Ed:
LMAO - That is toooo funny!

Leo said:

opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though

Click to expand...

In a similiar thought, if you do not have the tube installed, when the lens moves in and out of the body, what happens to the air inside the camera? It wil also be displaced, allowing air to infiltrate inside the camera from any opening......smartmedia/CF slots, battery terminals, AC connections, etc. So I doubt if it is a problem to worry about.

--
John

Fuji 6900Z, Fuji2600Z,
Pentax PZ-1p, Pentax ZX-M, Pentax MX, Oly Stylus
http://www.pbase.com/jglover

I am convinced and no holes through the camera or tube.))
Happy New Year!
Leo

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

The answer to the original question about the air and dust is quite obvious. When I had the 6900z in pieces last Saturday it became clear that the make up of the barrel is going to be a dust trap (tube and flter/tele lens or not) and this is probably why Fuji have added a carbon plate to the 602 in a seemingly vain attempt to collect dust before it hits the CCD.

The barrel is composed of three units. The outer case is unscrewable and comes away forward. It contains the screw thread to which the tube is attached which gives the "comfort factor" of sealing the barrel. I've no doubt that it does seal the barrel but dust and dirt will already be in there from both the manufacturing and packing processes and the only way to ensure the barrel'ss seal is worth having is to dismantle the camera and clean the lens areas inside and out before re-assembly and adding the tube. This would have to be carried out in a dust free environment to be effective. I was amazed at the amount of dust around the CCD and within the lens.

As to where the air goes, under the barrel cover is a 2 part telescopic lens tube. The inner part contains the lenses and moves in and out, the outer part has a lens at the front and a HOLE at the back, which lets out onto the CCD.

There is enough space between the two parts of the barrel for air to pass backwards and forwards (as in an extending telescope) and any excessive air pressure generated by sealing the whole barrel with an extension tube will be dissapated through the aforementioned hole right onto the CCD. If there is any dirt in the lens internal area, the air pressure plus static generated by the CCD will immediately attract dust (thus again giving rise to Fuji's carbon plate on the 602.

Finally, the only moving parts other than the two parts of the lens barrel are plastic cogs at the side of the lens which are controlled by the zoom button on the side of the barrel case. These travel about a turn in each direction, have little friction and are not lubricated.

PhilB

Leo said:

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

Click to expand...

--
PhilB

Alias said:

obvious. When I had the 6900z in pieces last Saturday it became
clear that the make up of the barrel is going to be a dust trap
(tube and flter/tele lens or not) and this is probably why Fuji

Click to expand...

Out of curiousity, while you had it apart did you see any way to force the lense to remain out? A motor that could be unplugged or a gear that could be removed?

From what I hear the lens never moves during the normal camera function, only during startup/shutdown....

It probably shares drive parts with the focus/zoom, but if it doesn't it might be a nice hack for those willing to do the work. (less battery drain, less air moving in and out of the camera body...)

(oh, and obviously one would need to be sure the lens stayed out, instead of being able to slide in/out of the camera at will...and be sure to keep a tube on the camera for protection...)

....david

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

--

Put the extension tube on, screw in a UV filter, and fuggedaboutit! until you swap in a polarizer. Don't drill any holes.

Jim Kennedy

Hi Davidi,

The outer barrel of the lens, as you say, only moves on start up and shut down within the barrel case. The inner barrel moves when zooming.

All the motor parts are sealed in the rear housing of of the outer barrel, into which the outer barrel retracts and I didn't dismantle the lens. There is a connection between the focus ring on the front of the lens case and the lens by the plastic cog I mentioned which seems to double as both the drive for the outer lens barrel and, when the camera is switched on and the barrel extended and MF selected, the drive for the manual focus.

I may be mistaken as to the dual use of the cog, but it is the only visible moving part.

As to "fixing" the outer barrel, if the cog is dual use, disabling it would lose you the MF and possibly the AF function and if the idea is to stop dust being dragged into the camera, you would still have to seal the gap around the outer barrel. Then you would have the problem of stopping the outer barrel being retracted as, my guess is, that it is held in place by some sort of stop which is moved into place by the cog moving in one direction under power and retracted when reversed under power.

PhilB

PhilB

david raistrick said:

david raistrick said:

obvious. When I had the 6900z in pieces last Saturday it became
clear that the make up of the barrel is going to be a dust trap
(tube and flter/tele lens or not) and this is probably why Fuji

Click to expand...

Out of curiousity, while you had it apart did you see any way to
force the lense to remain out? A motor that could be unplugged or
a gear that could be removed?

From what I hear the lens never moves during the normal camera
function, only during startup/shutdown....

It probably shares drive parts with the focus/zoom, but if it
doesn't it might be a nice hack for those willing to do the work.
(less battery drain, less air moving in and out of the camera
body...)

(oh, and obviously one would need to be sure the lens stayed out,
instead of being able to slide in/out of the camera at will...and
be sure to keep a tube on the camera for protection...)

....david

Click to expand...

--
PhilB

Leo

It's so easy to get a obsessive disorder as far as checking the camera for dust is concerned. I used to be staring at the lens of the camera at different angles more times than I was taking photographs! Even took the camera back once and got them to replace it because of a tiny spec of dust inside. See, I like to keep things in pristine condition and it does my head in when things like that happen.

I'm not as bad as I was; yeah, I've got the extension tube, but like you say dust still gets in, God knows how, but I've got a decent camera bag and I keep it in there.
Sorry Fuji-ites, but my next camera won't be a Fuji.....
--
If comments and feedback brighten a photographers day, let there be light!

Leo said:

I just received a Kenko 55mm to 55mm extension tube, a Hoya UV
filter and a cap. I planned to put it on the 602 and keep it there
to protect lens. Now, after I saw it and imagined how it would be
nice to have lens covered and protected I have a question. The
filter and tube connected to the camera would create a air tight
chamber. When the camera lens is extracted it will fill the space
inside the tube originally filled with air. Now air should go
somewhere. It will be squeezed through the camera insides out of
this chamber. When the camera turned OFF the effect will be
opposite the air will be sucked into the camera, through the camera
and finally into the tube. This will happened every time the camera
is turned ON and OFF. This process will force the outside air with
dust through the camera. There is no special channels for in the
camera for the air flow that means it should find the way though
the camera. It may flow around CCD and other parts which may be
lubricated.. This may cause the dust on CCD and everywhere inside.
I really feel to drill few very small halls through the tube to
prevent the air flow through the camera.
It would not take long for dust to be sucked into the camera
What is your experience and thoughts.
Thanks
Leo

Click to expand...

I don't leave an adapter and filter on my S602 ... nor my 4900.

I wonder why I don't get any dust problems?

..... maybe it's because it's not really a problem at all ........

Jake7 wrote:
I don't leave an adapter and filter on my S602.

I wonder why I don't get any dust problems?
..... maybe it's because it's not really a problem at all ........
Jake

Me too Jake
--
filibuster

I didn't have any problem for 18 months with my 6900z, then I found a piece of what looked like human skin on my CCD without warning, less than 24 hours after using the camera without any dust or debris visible.

The problems are real enough for a wide enough range of people to make the problem real. So far you have been lucky, don't bank on staying that way and, if the worst does happen to either of your cameras I hope you can still

PhilB

Jake7 said:

I don't leave an adapter and filter on my S602 ... nor my 4900.

I wonder why I don't get any dust problems?

..... maybe it's because it's not really a problem at all ........

Click to expand...

--
PhilB