12-12-2011, 05:05 AM
Ah yes.
The hot pixel issue was greatly exaggerated in that image.
further, cameras are quite good at compensating. it doubles the length of time to take the pic but as long as we're talking about handful of seconds it still shouldn't matter.
I'm a bit confused about this need. The limitation is dependent upon shutter speed. If shutter speed is longer than 1 sec then you need to use a tripod. if you need to use a tripod then 1s or 15s doesn't really matter.
I'm still a bit confused myself and still trying to learn about shooting in low light so maybe you or someone more experienced could clarify a bit.
From what I have read, higher ISO has noise no matter but the noise is a little more uniform (much like film grain) where long exposures at low ISO settings can cause chunky and colored noise. Although I haven't tried it yet, I've read that Noise Ninga or stacking can reduce the noise in higher ISO shots and that technique is preferrable when taking star shots/ night sky shots and others at night.
I have taken photos with my Rebel XT at night with very little light available that were shot at ISO 400 with a 4 sec exposure. From what I am reading here, I would not be able to do this with the SX40.
Here's a couple of things I've looked at:
http://www.cambridgeincolour.com/tutoria...-noise.htm
http://www.karbosguide.com/books/photobo...pter13.htm
http://photocamel.com/forum/photography-...h-iso.html
Would appreciate your thoughts.
The hot pixel issue was greatly exaggerated in that image.
further, cameras are quite good at compensating. it doubles the length of time to take the pic but as long as we're talking about handful of seconds it still shouldn't matter.
JoeM wrote:
[quote=mattkime]
I've never encountered the problems you describe and have done quite a bit of night photography. if you can point me to resources i'd be interested in reading them.
[quote=JoeM]
[quote=mattkime]
[quote=JoeM]One of the things I want to do is take night photos at higher ISOs in very low light, like the reviewer. Looks like the SX40 will not be able to handle that.
I'm a bit confused about this need. The limitation is dependent upon shutter speed. If shutter speed is longer than 1 sec then you need to use a tripod. if you need to use a tripod then 1s or 15s doesn't really matter.
I'm still a bit confused myself and still trying to learn about shooting in low light so maybe you or someone more experienced could clarify a bit.
From what I have read, higher ISO has noise no matter but the noise is a little more uniform (much like film grain) where long exposures at low ISO settings can cause chunky and colored noise. Although I haven't tried it yet, I've read that Noise Ninga or stacking can reduce the noise in higher ISO shots and that technique is preferrable when taking star shots/ night sky shots and others at night.
I have taken photos with my Rebel XT at night with very little light available that were shot at ISO 400 with a 4 sec exposure. From what I am reading here, I would not be able to do this with the SX40.
Here's a couple of things I've looked at:
http://www.cambridgeincolour.com/tutoria...-noise.htm
http://www.karbosguide.com/books/photobo...pter13.htm
http://photocamel.com/forum/photography-...h-iso.html
Would appreciate your thoughts.