Hi Astrophotographers !
6-7 years ago, Canon Eos 20d, 5d, etc... were fine tools for AstroPhoto,
but their very huge amount of Electronic Noise from iso 100 to 400,
made the iso 1600 setting mandatory for AstroPhotography use !
(exept during warm summer nights, say iso 800 setting ?)
Taking Pattern Noise in account, the measured DR was no more than ~9~10 EV
from iso 100 to 1600, so it was not a big problem using them at iso 1600 !
Exept the need of stacking 25-30 RAWs in DSS to get good results :
Fuji S2 Pro, Canon Eos 20d, 5d AstroPhotos :
Jean Claude DIMA
As there were no change in Canon's Electronic Noise levels at low iso settings :
http://forums.dpreview.com/forums/read.asp?forum=1032&message=35842756
I decided to change back to Pentax, and bought a K-5 and a "K" T2 adapter !
Now, the Pentax K-5 is playing in a very different world than the Eos :
= a total lack of Electronic Noise at iso 80 to 400 !
= a measured DR of about 14 EV at iso 80 !
+ with the Pentax K-5 at iso 80, you'll get very tiny RAWs, about 13-15 MB,
and you'll only need stacking from 3 to 6 RAWs in DSS to get good pictures :
http://www.chassimages.com/forum/index.php/topic,118675.75.html
http://www.chassimages.com/forum/index.php/topic,118675.100.html http://www.chassimages.com/forum/index.php/topic,118675.125.html http://www.chassimages.com/forum/index.php/topic,118675.150.html http://www.chassimages.com/forum/index.php/topic,118675.175.html
(say 3 RAWs for big luminous Deep Sky Objects... else 5-6 RAWs ?)
Pentax K-5 AstroPhotos :
Pentax-Full-Frame-Soon
of course, you may keep shooting AstroPhotos at hight iso settings,
but for example, when shooting at iso 12800 instead of iso 80 :
-- DR is only half the iso 80 DR !
-- SNR is only half than the iso 80 value !!
-- RAW Size is about twice the iso 80 RAW Size !!!
-- you'll need stacking much more RAWs to get rid of Noise !!!!
All photos presented here are taken at sea level, in a big big city,
with such light pollution making any visual observation impossible !
I am very excited to bring my Pentax K-5 in the mountains,
where I could test its resistance at low temperatures ?
and where, of course, i will get far better pictures !
Last edited by geo444; 04-09-2013 at 11:09 AM.
Reason: lost links