Question: Canon Rebel and hot pixels...

Archived from groups: rec.photo.digital (More info?)

Hey all.

I just got a Canon 300D, and am scrutinizing it to make sure if it's
got any problems out of the box.

I did a 30 second exposure with the lens cap on, to identify hot
pixels. After 30 seconds, one pixel was a middle-grey color. 5-seconds
was not enough to heat it up; the 5-second test was good.

I'm curious if Rebel owners have found that their CMOS sensor has
gained any hot pixels over time? I'm not tempted to get in a twist over
one hot pixel, especially if it takes but more than 10 seconds to heat
up - but I am curious to know what Canon's track record is for their
sensors getting more of them over the duration.

I understand that ambient temperature is an important factor in this
problem too.

Thanks for all comments!

BD

Archived from groups: rec.photo.digital (More info?)

In article <R_3Fe.2650$hc4.1890@newsfe6-win.ntli.net>, Philip Davies
<philip.davies@tesco.net> writes
>"BD" <bobby_dread@hotmail.com> wrote in message
>news:1122268554.195744.25050@g47g2000cwa.googlegroups.com...
>> Hey all.
>>
>> I just got a Canon 300D, and am scrutinizing it to make sure if it's
>> got any problems out of the box.
>>
>> I did a 30 second exposure with the lens cap on, to identify hot
>> pixels. After 30 seconds, one pixel was a middle-grey color. 5-seconds
>> was not enough to heat it up; the 5-second test was good.
>>
>> I'm curious if Rebel owners have found that their CMOS sensor has
>> gained any hot pixels over time? I'm not tempted to get in a twist over
>> one hot pixel, especially if it takes but more than 10 seconds to heat
>> up - but I am curious to know what Canon's track record is for their
>> sensors getting more of them over the duration.
>>
>> I understand that ambient temperature is an important factor in this
>> problem too.
>
>All manufactures cameras lcd panels computers etc make a point of saying how
>many ;pixels have to be dead before it is counted as damaged.
>Generally this is at least 5 in each colour.
>Testing the way you are doing is going to cause damage that you wont be able
>to claim for.

I broadly agree with the first part of your answer (though it is
significant that some manufacturers or brands have a much better track
record in practice than that).

The final comment, though, sounds very odd to me. Clearly, the
appearance of the odd dead or hot pixel over time will not be covered by
any warranty or legal "merchantable quality" rights - it is accepted as
inevitable that such sensors will deteriorate over time in this way.
However, how would using the camera in a way that is well within
specification and clearly envisaged by the manufacturer cause any
invalidation or worsening of any legal rights the owner may have?

I have used my 10D many times at 30 seconds and cannot see how it would
be considered abuse.

David
--
David Littlewood

Archived from groups: rec.photo.digital (More info?)

"BD" <bobby_dread@hotmail.com> wrote in message
news:1122268554.195744.25050@g47g2000cwa.googlegroups.com...
> Hey all.
>
> I just got a Canon 300D, and am scrutinizing it to make sure if it's
> got any problems out of the box.
>
> I did a 30 second exposure with the lens cap on, to identify hot
> pixels. After 30 seconds, one pixel was a middle-grey color. 5-seconds
> was not enough to heat it up; the 5-second test was good.
>
> I'm curious if Rebel owners have found that their CMOS sensor has
> gained any hot pixels over time?

I've got over 50k actuations on mine and no hot pixels. But then I've only
done maybe 100 30-second exposures.