camera problem ?

brianp55

brianp55

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brian
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hi, this morning after taking a couple of shots i noticed on the lcd whites changing to black and back again, in effect flashing. this is happening on photo,s that were taken a while back also. anybody come across this before ? seems i may have a problem.
 
Sound like you have Blown Highlight Warning on (or somthing like that), just telling you ther is no data in those pixels as they are over exposed (I think thats what it is anyway)

Edit: Called Higlight Alert on my 40D's
 
No probs with the camera, it's exactly as Cosmix says, you have blown highlights alert enabled in the camera. You can disable it if you wish but it's a pretty useful function anyway.
 
cheers for the quick replies, put my mind at rest. did have a play around with the functions so have changed something somewhere :cuckoo: can only find highlight tone priority and it is disabled will go back to manual.
 
brianp55 said:
cheers for the quick replies, put my mind at rest. did have a play around with the functions so have changed something somewhere :cuckoo: can only find highlight tone priority and it is disabled will go back to manual.
Click to expand...
It's the 2nd blue icon on top of the 50D menu screen. First item on that screen - Highlight Alert enable/disable.
 
brianp55 said:
cheers for the quick replies, put my mind at rest. did have a play around with the functions so have changed something somewhere :cuckoo: can only find highlight tone priority and it is disabled will go back to manual.
Click to expand...

If you shoot in RAW then you should disable this as said just turn off hight warning
 
Because with raw, you can retrieve information that simply doesn't exist...
 
AJH748 said:
Why should you disable it if you shoot in RAW :thinking:
Click to expand...

You should not. If you shoot Raw, changing the Contrast in Picture Styles alters the level at which blinkies cut in, so you can fine tune it to help give exactly the Raw you want.

If I had only one thing to assist with getting the exposure right, it would be the Highlight Alert (blinkies). More useful than the histogram IMHO, but it's great to have both.
 
Nod said:
Because with raw, you can retrieve information that simply doesn't exist...
Click to expand...

Now that is an awesome comment :clap::cuckoo::clap::cuckoo::clap: I *truly* hope one day that becomes reality

RAW does record more data than JPEG (14/12bit vs compressed 8bit) which allows to recover some highlight data. The scope is limited to around +0.5EV to +1EV max "overexposed" highlights. *Note the data is still there, but it would be clipped from JPEG by default. If there is no data (100% exposure) it can't be retrieved. It applies to all physical devices.
 
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