Dust on ,my focus screen
Posted 08/05/2011 - 10:20
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Anvh wrote:
Well you can always get the brush visibledust (articbutterfly) make for cleaning the mirror and focusing screen but i've no idea what the difference is between the normal one?
]http://www.visibledust.com/products3.php?pid=603
Well you can always get the brush visibledust (articbutterfly) make for cleaning the mirror and focusing screen but i've no idea what the difference is between the normal one?
]http://www.visibledust.com/products3.php?pid=603
There is probably no difference at all!....just a way of extracting more cash from the photographic community!..lol
K20D...ist DS ,DA18/55,DA16/45.DA* 50/135,"A"1.7 50MM..."A" 70/210..M 50mm f2...Tamron 90mm macro,28/300 Tamron,200/500 Tamron 6.9....A Pentax DA*300... Sigma10/20,FA31mm 1.8 Ltd*********,FA 77mm Ltd!
Posted 08/05/2011 - 10:41
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Yeah maybe.
Btw are there liquids you can use to make the mirror anti-static?
I mean the mirror moves up and down with every shutter actions so if it would be anti-static i doubt any dust will be able to stay on for long...
Btw are there liquids you can use to make the mirror anti-static?
I mean the mirror moves up and down with every shutter actions so if it would be anti-static i doubt any dust will be able to stay on for long...
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 08/05/2011 - 11:34
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The mirror is already treated by the manufacturer - add other liquids and the effect on those coatings is unknown.
Best regards, John
Posted 08/05/2011 - 11:40
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johnriley wrote:
The mirror is already treated by the manufacturer
How do you know?The mirror is already treated by the manufacturer
I know the filter on the sensor has an anti-static coating but never heard something about the mirror.
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 08/05/2011 - 12:11
Link
I know many things Stefan, but if it wasn't what would happen to a silver surface?
We only have to examine all our silver cutlery to get the answer to that one.....
Generations of those who polished the silver will also know.
We only have to examine all our silver cutlery to get the answer to that one.....
Generations of those who polished the silver will also know.
Best regards, John
Posted 08/05/2011 - 12:32
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But you wrote in anotehr comment that there is a coating on the mirror, so the silver in the mirror never gets into contact with the dust to begin with so is the coating anti-static as well?
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 08/05/2011 - 12:46
Link
The silver (or aluminium)will be coated to stop it corroding, not sure if it's anti-static or not, but it's better left alone.. too easy to scratch.
Not really relevant to cameras, but this "how to" shows you how to make a mirror. It doesn't go as far as coating it.
Not really relevant to cameras, but this "how to" shows you how to make a mirror. It doesn't go as far as coating it.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
Pentax K-1 + K-5 and some other stuff
Algi
Posted 08/05/2011 - 13:11
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AP in the 1930s and 1940s (no, I'm not that old, but I collect things!) carried useful articles such as "How To Make an Acetylene Generator" and, more pertinent here, "How to Resilver your Mirror" but those days are long gone.
Algi is correct in that not all silvering is actually silver, but the best is. The ME and MX, for example, are properly silvered pentaprisms.
Algi is correct in that not all silvering is actually silver, but the best is. The ME and MX, for example, are properly silvered pentaprisms.
Best regards, John
Posted 10/05/2011 - 13:02
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Rocket Blower every time
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Posted 10/05/2011 - 13:07
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gartmore wrote:
Rocket Blower every time
I totally agree!
Rocket Blower every time
Posted 11/05/2011 - 16:08
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Quote:
AP in the 1930s and 1940s (no, I'm not that old, but I collect things!)
and i was going to put you in this weeks comp
AP in the 1930s and 1940s (no, I'm not that old, but I collect things!)
playing firm but fair all the way
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10412 posts
18 years
Dordrecht,
the Netherlands
I think you overestimate the "slamming" forces, Stefan.
I don't know how heavy the mirror is and how fast it moves but i would find it very strange that the force you apply with a soft brush would be greater.
here is the K-X in action.
http://www.youtube.com/watch?v=bFDas-9UJS4
And here it is in slowmo
http://www.youtube.com/watch?v=LJiIQZ9iX-k&feature=related
It's marvelous to see how fast and precise it is but it is anything but a subtle movement.
So if the mirror would start moving because i touch it lightly with a brush it would most likely move during the action as well by the air it moves around and when the mirror start and stop moving.
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ