....and again Canon does it...with a 12800 ISO
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Canon 50D
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weixing
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Hi,
Anyway, the high ISO is not really useful in Astrophotography except if you shoot in JPEG and want to see the output on the DSLR LCD screen.
Have a nice day.
I think Canon just play along with Nikon to provide a ISO above 3200 to 12800... except it tell you the truth how the high ISO is produce by using the word "expandable"... ha ha ha....and again Canon does it...with a 12800 ISO
Anyway, the high ISO is not really useful in Astrophotography except if you shoot in JPEG and want to see the output on the DSLR LCD screen.
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." 
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weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
Have a nice day.
Yes if you shoot in JPEG or for non-Astro photo.but low noise iso1600 is still a good thing....
Have a nice day.
Last edited by weixing on Wed Aug 27, 2008 9:44 am, edited 1 time in total.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." -
weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
ISO does not change the sensitivity of the sensor, it just change the gain of the amplifier. Christian Buil did a test in his Canon 40D review for Astrophotography on the effect of ISO when shooting in RAW. He took 5 x 120s from ISO 100 to ISO 800 and found that all stars appear in the image took using ISO 800 also appear in the image took using ISO 100.
By the way, IMHO, when shooting object with dim feature such as Nebula, higher ISO may be necessary as the S/N ratio of the dim feature may be too low if using a low ISO.
Anyway, for me, I always shoot a few test shot first to determine which ISO to use. Usually, I'll select the highest ISO that will not overexpose any part of the image in the given exposure time and that ISO is always ISO 800 to date.
Just my S$0.02.
Have a nice day.
ISO does not change the sensitivity of the sensor, it just change the gain of the amplifier. Christian Buil did a test in his Canon 40D review for Astrophotography on the effect of ISO when shooting in RAW. He took 5 x 120s from ISO 100 to ISO 800 and found that all stars appear in the image took using ISO 800 also appear in the image took using ISO 100.
By the way, IMHO, when shooting object with dim feature such as Nebula, higher ISO may be necessary as the S/N ratio of the dim feature may be too low if using a low ISO.
Anyway, for me, I always shoot a few test shot first to determine which ISO to use. Usually, I'll select the highest ISO that will not overexpose any part of the image in the given exposure time and that ISO is always ISO 800 to date.
Just my S$0.02.
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance."