Web Analytics RiceHigh's Pentax Blog: The Large Air Blower Model K-5IIs! :-o

Wednesday, December 12, 2012

The Large Air Blower Model K-5IIs! :-o

A K-5IIs user complained about his new K-5IIs body had an air leakage problem which is demonstrated in the following YouTube video that he uploaded:-



(http://youtu.be/1WFT5sQinlo)

He hence requested for a replacement unit. After the replacement unit arrived, he did the following comparison test:-



(http://youtu.be/6qt4FmiP8vI)

Via: Post @ Pentax Fans Club (Taiwan)

Wow, what a difference and what a QC! Pentax just built and marketed a supposedly sealed-model which is actually not completely sealed! :-o After this incident, I think Pentax should add a toilet paper test in their QC line for what this end-user has done, so as to check if the sealing of their cameras is proper, frankly!
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Alex's avatar

Alex · 639 weeks ago

I don't remember any Pentax DSLR being advertised as airtight...
7 replies · active 639 weeks ago
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RiceHigh's avatar - Go to profile

RiceHigh 110p · 639 weeks ago

When it is weather-sealed, it is supposed to be. And, don't you see the replacement unit is in order?
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Alex's avatar

Alex · 639 weeks ago

A weather sealed DSLR + lens is definitely NOT supposed to be airtight. No DSLR is airtight, including top-end Canikons... it's just not possible, with a simple bayonet mount, lenses that are changing their volumes and easy to use controls.
Think about it: the lens' internal volume is changing; air MUST get in and out, otherwise you'll get a nice pressure difference which will make zooming in or out impossible.

By the way, in both videos the paper is moving... what difference?
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RiceHigh's avatar - Go to profile

RiceHigh 110p · 639 weeks ago

You really can't see the difference?
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Alex's avatar

Alex · 639 weeks ago

My bad, I only watched the first part of the second video - which was actually the first camera.

I can see that nothing is controlled in the "test", no effort was made to even localize the air flow.
So, while I definitely can't rule out e.g. a gap in the LCD's sealing, I'd say I also can't be sure this is actually the case. Who knows, maybe the sealing on the first camera's lens is too tight and it partially forces the air out through the camera's sealing.
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Leschi's avatar

Leschi · 639 weeks ago

I'm with you Alex. The camera is "weather" sealed what means water without any pressure. Where should the air go to and come from if you have a sealed lens? ...build a vacuum within the body and lens? :D
I think important is, that no dirt or water comes in the body. What's coming out doesn't matter.
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guest's avatar

guest · 639 weeks ago

But if it blows air it also sucks air! And if it do it through the body when you move the lens it have to take dust. After some zoom and some pictures your sensor will be similar to new Nikon (it will be like a garbage bag in a vacuum cleaner)._Do you Leschi and Alex, really want to have a camera like that?
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Alex's avatar

Alex · 639 weeks ago

The camera+lens will sucks air (and then blow it) anyway.
If there is indeed a gap in the sealing, I definitely don't want that. But I wouldn't want an airtight camera, either... huge, heavy, expensive and cumbersome.
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djezek's avatar

djezek · 639 weeks ago

And how you personally will solve air compressibility in totally air-sealed body? ability to not to take dust particles of some size inside the lens/body is totally different issue than absolutely air-sealed lens. there is NO solution to absolutely air-sealed (zoom lens), because lens needs to move masses of air by its very principle. please, try to use brain before you start catch pentax per word.
1 reply · active 639 weeks ago
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djezek's avatar

djezek · 639 weeks ago

ok, my stupididy, i was wrote before read: yes, it is body problem and as i tried now, my K200D doesnt have this problem. so there is something wrong. my apologies
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Wider's avatar

Wider · 639 weeks ago

Absurd. Even house window is not 100% airtight. But it protects from snow and rain.

And K-5 is weather-proof camera, not hermetic camera.
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zosX's avatar

zosX · 639 weeks ago

So he got a bad camera. Shit happens Oh no!!! Pentax is doooooomed!
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communism ghost's avatar

communism ghost · 639 weeks ago

If I near at hand had those 2 cameras, I could answer Internet community.
But I have near at hand only my K-5 of the first version.
By the way!
On video to us don't show that part of the camera with which air but only the opposite proceeds.
The part necessary to us is hidden. From that party there is "allegedly, an air blowing" outside.
Pay attention to an important point: on one video, paper doesn't react to air "suction".
Really, has to! Time air leaves "through an opening", means has to through it and enter.
But on video, paper doesn't react to absorption of air in any way, it doesn't occur!
Here it is possible to assume thought that somewhere on the back panel
K-5 II has to be the valve which is pumping over air only in one party.
And what is from that party of the camera, on the back panel?
The screen, at the top of 2 buttons, further sideways cut with a rubber slip.
I tried to blow air lips of the K-5 serially: at first via 2 buttons,
then through a rubber cap, and, at last via the screen. It isn't blown. In any way. Doesn't climb even under
stronger pressure, than it is represented on video. Then - inside the valve? ;-)
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communism ghost's avatar

communism ghost · 639 weeks ago

Continuation. The role of the valve plays a material from which make moisture protective a sealant. It is Poron XRD. PORON XRD technology: it is created specially for BAUER Hockey. The supereasy, soft, flexible, elastic material, capable to distribute more than 90% of energy of force of blow. At collision with a heavy subject instantly hardens and absorbs practically all energy of blow. PORON XRD is air-permeable. Besides, Poron XRD is waterproof.
1 reply · active 639 weeks ago
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Alex's avatar

Alex · 639 weeks ago

I'm not really sure what you're saying, but I've done a quick test: what would happen if I (even slightly) open the ports rubber cover? Yep, you guessed it: air will blow through the opening. Same for the card door.
However, the author says the air goes through the viewfinder... but was the test precise enough to indicate it is indeed so?
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communism ghost's avatar

communism ghost · 638 weeks ago

Unfortunately, I have no opportunity to check option with the view-finder as there is no protected lens. My not tight lens of FA28-70/4 AL doesn't want to blow air through any openings :) But if, as shown in this video, really blows via the view-finder, air leaves through a sealant the material Poron NRG.

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