40d long explosure issue

[ggodetucsamoht]

Hi

I just took some long explosure yesterday night i found out some issue.

after a long explosure of 30sec the shutter goes back and the preview of image on the LCD only appear after long time, in this case is about 30sec++

i try on 2min, or 3min it will take even long time to show the image preview

is that normal in 40d?

[grantyale]

Turn off the long-exposure noise reduction option in the custom functions

[ggodetucsamoht]

Originally Posted by grantyale Turn off the long-exposure noise reduction option in the custom functions

bingo....everything back to normal already.

but can i also find out whether if this really reduce the noise on long explosure shots?

thanks and appreciate for your advice.

[catchlights]

Originally Posted by ggodetucsamoht bingo....everything back to normal already. but can i also find out whether if this really reduce the noise on long explosure shots? thanks and appreciate for your advice.

just take two shots, one with and one without and compare.

[lypklypk]

Originally Posted by ggodetucsamoht bingo....everything back to normal already. but can i also find out whether if this really reduce the noise on long explosure shots? thanks and appreciate for your advice.

'Exposure', not 'explosure'

[calebk]

Originally Posted by ggodetucsamoht bingo....everything back to normal already. but can i also find out whether if this really reduce the noise on long explosure shots? thanks and appreciate for your advice.

Yes it does. What the camera does is it repeats the exposure with the shutter closed to find hotspots and hot pixels, and then maps them over the photo you took. It then checks to see if these hot spots/pixels match up and will correct accordingly.

[ggodetucsamoht]

Originally Posted by calebk Yes it does. What the camera does is it repeats the exposure with the shutter closed to find hotspots and hot pixels, and then maps them over the photo you took. It then checks to see if these hot spots/pixels match up and will correct accordingly.

cool.....thanks dude.

i was made to wait for 10mins plus for a 300sec exposure