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Micro Four Thirds Discuss the newly announced Micro Four Thirds addition to the Four Thirds system family here.

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  #1  
Old 30th March 2011
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Exposed sensor

As the micro fourthirds cameras have no mirror assy, is the sensor exposed all the time whilst changing lenses with a greater risk of dust on the sensor or am I missing something. I have just ordered the Olympus EPL-2 twin lens kit and was just wondering if I need to be extra carefull.
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Old 30th March 2011
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Re: Exposed sensor

Yes. With the lens off on a DSLR the mirror still protects the sensor, although dust has a magical ability to find its way around any obstical through even the tiniest gap. With the sensor fully exposed on MFT it is obviously more vunerable, although it's amazing how effective the SSWF is. It's a good habit when changing lenses on any camera to face away from the wind and keep the lens throat pointing downwards all the time that the lens is off the body, which should be kept to the minimum possible duration. Make sure the lens you want is ready before you remove the existing lens and check that there is no dust on the rear element which could transfer to the sensor.

I haven't had my E-PL1 long but have had no dust problems so far.
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Old 30th March 2011
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Re: Exposed sensor

Surely unless you are in cleaning mode or in Bulb with the shutter release pushed the shutter is closed.

Or am I missing something.
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Old 30th March 2011
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Re: Exposed sensor

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Originally Posted by andym View Post
Or am I missing something.
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Old 30th March 2011
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Re: Exposed sensor

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I know we have all done it but shouldn't the camera be powered down when changing lenses or do the PENs have the shutter open all the time until exposure?
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Old 30th March 2011
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Re: Exposed sensor

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Originally Posted by andym View Post
I know we have all done it but shouldn't the camera be powered down when changing lenses or do the PENs have the shutter open all the time until exposure?
The Pens have shutter open at all times, except moment of exposure, even when turned off. You are quite right, though, the camera should be turned off when changing lenses so that dust removal is activated when turning back on.
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Re: Exposed sensor

Thats something I'd not considered before.To much a SLR person
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Re: Exposed sensor

Thanks for the quick replies, will just have to be carefull when lens changing am looking forward to the camera arriving.Hopefully before weekend
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Old 30th March 2011
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Re: Exposed sensor

Quote:
Originally Posted by andym View Post
Surely unless you are in cleaning mode or in Bulb with the shutter release pushed the shutter is closed.

Or am I missing something.
Yep, you missed the fact that the shutter normally stays open on the PENs.

Edit: Sorry, I should have read the rest of the thread before replying.

My main method of changing lens are to loosen the rear cap on the lens to go on, remove the lens from the camera & quickly transfer the cap to that lens & then put the new one on with the camera pointing down as much as is practical, plus avoiding lens changes in windy locations.
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Re: Exposed sensor

Only had one speck of dust on my E-P2 which wasn't removed by cleaning cycle. Easily blown off. Otherwise just use common sense as stated above.
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Re: Exposed sensor

Quote:
Originally Posted by andym View Post
Thats something I'd not considered before.To much a SLR person
Andy

i have a SLR OM10 can i change the lens with film in the camera?

i know stupid question but bought the OM10 for a bit of fun and dont know much about them
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Re: Exposed sensor

Quote:
Originally Posted by Robusto View Post
Andy

i have a SLR OM10 can i change the lens with film in the camera?

i know stupid question but bought the OM10 for a bit of fun and dont know much about them
Hi

Yep,on an SLR the shutters always closed until you hit the release.
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Re: Exposed sensor

Out of interest hows the shutter lag on a PEN with having to close,open,close and open again between frames?
If we ever get a high end mirrorless 4/3 camera could this be an issue?

I supose if they went shutterless and just turned the sensor on and off for exposure it wouldn't matter and you could achieve very high continuous shooting rates.
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Old 31st March 2011
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Re: Exposed sensor

Quote:
Originally Posted by andym View Post
Out of interest hows the shutter lag on a PEN with having to close,open,close and open again between frames?
If we ever get a high end mirrorless 4/3 camera could this be an issue?

I supose if they went shutterless and just turned the sensor on and off for exposure it wouldn't matter and you could achieve very high continuous shooting rates.
Shutter lag on Pens is not something I notice much in practice. There is no mirror and that may compensate.

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Re: Exposed sensor

Quote:
Originally Posted by andym View Post
I supose if they went shutterless and just turned the sensor on and off for exposure it wouldn't matter and you could achieve very high continuous shooting rates.
Electronic shutters (rather than electronically controlled mechanical shutters) are certainly a possibility and were mentioned by Mark Thackara at his recent presentation to Barking Photographic Society. Definitely something for the future with all kinds of potential benefits. It's not just about losing the mirror by any means, that's why mirrorless technology is going to bring about such a massive change in the future of photography and the type of cameras we use. Today's Pens are just the start, the tip of the iceberg.
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