«

I have a remote timer cable release for the 10D. Suddenly, I can now take
exposures longer than 30 seconds. I can let an exposure run for hours if I
desire. My questions are as follows:::::::::::

1. Can the sensor be damaged by using a longer exposure......... what of 5
min, 20 min, 30 minutes, etc?

2. As you go for longer exposure times, what type of distortion or
technical limit will I run into with digital that I would not run into with
film?

3. Anything I should know before taking longer (for low light shots)
exposure shots with my 10D and the remote timer switch?

Jimmy

"Jimmy Smith" <> wrote in message
news:MJUMc.25686$.. .
> I have a remote timer cable release for the 10D. Suddenly, I can now take
> exposures longer than 30 seconds. I can let an exposure run for hours if
I
> desire. My questions are as follows:::::::::::
>
> 1. Can the sensor be damaged by using a longer exposure......... what of
5
> min, 20 min, 30 minutes, etc?
>
> 2. As you go for longer exposure times, what type of distortion or
> technical limit will I run into with digital that I would not run into
with
> film?

Hot pixels or stuck pixels (meaning pixels that are improperly activating a
particular color, even though it hasn't been exposed to it) will become
brightly visible...meaning you will have to remove them in post-processing.
Actually though, the 10D (and Canon's other CMOS sensor DSLRs) are arguably
the best digitals when it comes to handling long exposures well. I visited
Carlsbad Caverns last Spring, taking many many long exposures with with my
10D. Many of them were over a minute, and the results were amazingly clean
in terms of noise and stuck/hot pixels.

In article <MJUMc.25686$>, "Jimmy Smith" <> wrote:
>I have a remote timer cable release for the 10D. Suddenly, I can now take
>exposures longer than 30 seconds. I can let an exposure run for hours if I
>desire. My questions are as follows:::::::::::
>
>1. Can the sensor be damaged by using a longer exposure......... what of 5
>min, 20 min, 30 minutes, etc?
>
>2. As you go for longer exposure times, what type of distortion or
>technical limit will I run into with digital that I would not run into with
>film?
>
>3. Anything I should know before taking longer (for low light shots)
>exposure shots with my 10D and the remote timer switch?

For very long exposures, make sure the battery is freshly charged.
Even better, consider buying and using the mains adapter. That way you won't
have the battery die partway through an exposure.

--
KRs
dslr

Jimmy Smith wrote:
> I have a remote timer cable release for the 10D. Suddenly, I can now
> take exposures longer than 30 seconds. I can let an exposure run for
> hours if I desire. My questions are as follows:::::::::::
>
> 1. Can the sensor be damaged by using a longer exposure.........
> what of 5 min, 20 min, 30 minutes, etc?

No. Think about the instructions for cleaning sensor.

>
> 2. As you go for longer exposure times, what type of distortion or
> technical limit will I run into with digital that I would not run
> into with film?

Noise. If you get a bad pixel or two, then Paintshop is your friend.

>
> 3. Anything I should know before taking longer (for low light shots)
> exposure shots with my 10D and the remote timer switch?
>
Test away with known targets first. Try painting a room with flashlight or
yourself into the picture. You can have a lot of fun with long exposures
and digital makes it instant gratification. Have a fine and amusing time.

-paul

In article <MJUMc.25686$>,
says...
> I have a remote timer cable release for the 10D. Suddenly, I can now take
> exposures longer than 30 seconds. I can let an exposure run for hours if I
> desire. My questions are as follows:::::::::::
>
> 1. Can the sensor be damaged by using a longer exposure......... what of 5
> min, 20 min, 30 minutes, etc?

Depending if you hold the sensor straight into the full moon or not.
I doubt there are any problems taking shots in the dark.

My 10D had dead and hot pixels straight of the box.
The next one was better....

> 2. As you go for longer exposure times, what type of distortion or
> technical limit will I run into with digital that I would not run into with
> film?
>
> 3. Anything I should know before taking longer (for low light shots)
> exposure shots with my 10D and the remote timer switch?
>
> Jimmy

Cheers

--

Looking for a dream wedding?
http://www.palmcoveweddings.com/

"Jimmy Smith" <> somehow managed to post:

>I have a remote timer cable release for the 10D. Suddenly, I can now take
>exposures longer than 30 seconds. I can let an exposure run for hours if I
>desire. My questions are as follows:::::::::::
>
>1. Can the sensor be damaged by using a longer exposure......... what of 5
>min, 20 min, 30 minutes, etc?
>
>2. As you go for longer exposure times, what type of distortion or
>technical limit will I run into with digital that I would not run into with
>film?
>
>3. Anything I should know before taking longer (for low light shots)
>exposure shots with my 10D and the remote timer switch?

Should be OK, just try not to do this ...

http://ireid.home.cern.ch/ireid/images/JuraSunset.wmv (3.7 Mb)
(Nikon CCD)

--
HooDooWitch (NaCl - Gratis)

http://www.usefilm.com/photographer/51251.html

In article <>, "Paul Cassel" <> wrote:
>Jimmy Smith wrote:
>> I have a remote timer cable release for the 10D. Suddenly, I can now
>> take exposures longer than 30 seconds. I can let an exposure run for
>> hours if I desire. My questions are as follows:::::::::::
>>
>> 1. Can the sensor be damaged by using a longer exposure.........
>> what of 5 min, 20 min, 30 minutes, etc?
>
>No. Think about the instructions for cleaning sensor.

Irrelevant - the sensor is not turned on during cleaning.

--
KRs
dslr

In article <ce33g6$akh$>,
dslr <> wrote:
>In article <>, "Paul Cassel" <> wrote:
>>Jimmy Smith wrote:
>>> I have a remote timer cable release for the 10D. Suddenly, I can now
>>> take exposures longer than 30 seconds. I can let an exposure run for
>>> hours if I desire. My questions are as follows:::::::::::
>>>
>>> 1. Can the sensor be damaged by using a longer exposure.........
>>> what of 5 min, 20 min, 30 minutes, etc?
>>
>>No. Think about the instructions for cleaning sensor.
>
>Irrelevant - the sensor is not turned on during cleaning.

The sensor will collect charge whenever there is light falling on it. The
only way to stop it is to keep it in the dark.

Jimmy Smith wrote:

> 2. As you go for longer exposure times, what type of distortion or
> technical limit will I run into with digital that I would not run into with
> film?

Take a dark frame (same duration) so you'll be able to remove hot pixels
more easily.

--
Frédéric

> >3. Anything I should know before taking longer (for low light shots)
> >exposure shots with my 10D and the remote timer switch?
>
> Should be OK, just try not to do this ...
>
> http://ireid.home.cern.ch/ireid/images/JuraSunset.wmv (3.7 Mb)
> (Nikon CCD)
>
> --
> HooDooWitch (NaCl - Gratis)
>
> http://www.usefilm.com/photographer/51251.html

Wow! That's a painful demonstration.