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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 29 Dec 2011 (Thursday) 07:13
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LCD Display vs Viewfinder

 
dariad
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Dec 29, 2011 07:13 |  #1

I find it very difficult to use the T3i's viewfinder (I wear trifocals and can't focus properly), and find myself always using the LCD screen. Do I have to cover the viewfinder when I use the LCD screen or does using one negate the other?




  
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greenjeans
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Dec 29, 2011 08:45 |  #2

I have heard folks say to cover the viewfinder because stray light will enter and slightly throw off exposure, but I have no experience either way. Canon does put the cover for the viewfinder on the strap, so there must be times when it should be used. Haven't checked my manual about this.


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rick_reno
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Dec 29, 2011 08:52 |  #3

have you looked into one of those rubber hood things for eyeglass wearers?




  
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Albert ­ Nam
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Dec 29, 2011 08:57 |  #4

In live view the mirror is locked up so you shouldn't have to cover the viewfinder.


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SuzyView
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Dec 29, 2011 09:38 |  #5

I heard some people have this problem. I am a pro these days and never use the live-view. I like the viewfinder and it's easy to compose for me that way. But with any gear you purchase, just work with it as best you can and see what happens.


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gjl711
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Dec 29, 2011 09:45 |  #6

greenjeans wrote in post #13614541 (external link)
I have heard folks say to cover the viewfinder because stray light will enter and slightly throw off exposure, but I have no experience either way. Canon does put the cover for the viewfinder on the strap, so there must be times when it should be used. Haven't checked my manual about this.

Interesting that this should come up. Earlier this week I was trying to capture the constellation of Orion. I was using the 5DMkII, 50mm f/1.4 and long exposures, 30sec. Well the first few pics came out blown out, totally overexposed. I kept adjusting the shutter speed and ISO until I got a picture. Thing is that the exposure was so short that you could barely see the stars. I finally figured out that the landscape lights that were behind me were bright enough so that the light entering the VF was being captures. I covered the VF and was back shooting at 30 sec.

So, if you are taking long exposure pics, I would definitely worry about how much light enters the VF. If the exposure times are short, I would worry much less. But if you are using the LCD to compose, focus, and take the pic, why take chances, cover the VF.


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tzalman
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Dec 29, 2011 09:51 |  #7

Albert Nam wrote in post #13614588 (external link)
In live view the mirror is locked up so you shouldn't have to cover the viewfinder.

Not only is the mirror up and blocking light from the optical vf, but also the normal metering system is turned off and exposure is calculated from the digital image from the sensor.


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oldvultureface
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Dec 29, 2011 10:02 |  #8

Albert Nam wrote in post #13614588 (external link)
In live view the mirror is locked up so you shouldn't have to cover the viewfinder.

Exactly. Metering is limited to evaluative and is read from the sensor. The viewfinder is blocked by the mirror so the usual metering method (a sensor reading the focusing screen) is disabled.




  
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hania
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Dec 29, 2011 12:40 |  #9

greenjeans wrote in post #13614541 (external link)
I have heard folks say to cover the viewfinder because stray light will enter and slightly throw off exposure, but I have no experience either way. Canon does put the cover for the viewfinder on the strap, so there must be times when it should be used. Haven't checked my manual about this.

I was photographing some birds on the nest , setting AV; I decided on a depth of field and iso and reckoned that any small differences in exposure wouldn't matter much

photos I took myself were fine (blocking the viewfinder) , those taken at a distance using a wireless shutter release were all over the place - the exposure was affected by light bleed! Never thought it could have such an effect.

Apparently, I should have set the camera on manual to make sure this didn't happen.


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LCD Display vs Viewfinder
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