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Cameras, Lenses and Accessories: Discuss focusing screen on a canon camera...i have noticed quite a few spots on my focusing screen on my camera . i know how to clean ...
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Old 23-09-2012, 18:01   #1 (permalink)
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focusing screen on a canon camera

i have noticed quite a few spots on my focusing screen on my camera .
i know how to clean the sensor but the screen just seams to produce more problems ,so I've read .
has anyone come across this problem before and can direct me on how to solve this.
much appreciated guys
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Old 23-09-2012, 18:15   #2 (permalink)
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Re: focusing screen on a canon camera

Blower brush
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Old 23-09-2012, 18:16   #3 (permalink)
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Re: focusing screen on a canon camera

If you have got dust on the outside of the focussing screen it should come off with a brush or blower - or a damp cotton bud.

If it is on the inside it has to be stripped down to access the other side and the bottom of the pentaprism. Not sure if this is a DIY job these days. Years ago you could change the focussing screen yourself.
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Old 23-09-2012, 18:49   #4 (permalink)
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Re: focusing screen on a canon camera

It will depend on the camera model but, as Dabhand suggests, these screens are removeable in some models (check the handbook). I actually acidentally hit the release button on my screen once during a photoshoot and it fell to the ground. That was enough to scratch it so be very carful handling a focusing screen. However, it gave me an excuse to buy a different type of screen. This came with a special tool for removing and inserting to ensure that you never touch the screen.
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Old 23-09-2012, 19:00   #5 (permalink)
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Re: focusing screen on a canon camera

Also use only water if you do need to resort to a damp edge of a lens tissue lightly dragged over the screen - use no pressure. It is often enough to take stubborn particles away.

Like Dave I've had my own bad experience several years ago, used a blower capsule (rechargeable canister) to clean a Hasselblad screen. Through an unfortunate sequence of events, the temperature the air came out of the capsule chilled sufficiently quickly to cause the screen to craze - they are only plastic. Expensive lesson, as I had already replaced the standard screen for the one I wanted.
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Old 23-09-2012, 22:31   #6 (permalink)
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Re: focusing screen on a canon camera

Quote:
Originally Posted by grease spot View Post
Also use only water

Just as an addendum to this good advice. If possible use distilled water, tap water when it evaporates leaves tiny crystal deposits which can leave a slight cloudy/milky film depending on the hardness of your water area and the amount of chlorination etc.
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Old 27-09-2012, 12:23   #7 (permalink)
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Re: focusing screen on a canon camera

thanks guys i have done a little more reading on this and i think i will leave the self cleaning for the time being . but my car needs a service so on that basis i might just get the camera done at the same time ,at a different place of course..
Another thing, how do you know that the pills you take don't work anymore.: but . ask the same question on this topic in a thread (removing dust from the Sensor ) )... gives you an idea....
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