Canon EOS 1000D strange noise pattern
Posted 29 September 2013 - 04:46 AM
I recently got an astromodified Canon EOS 1000D (Rebel XS). I tried shooting some test images and I always get a strange noise pattern (see image: 2 min. at ISO 800, camera without lens and closed with lid, LCD off, contrast stretched). There is amp glow visible (low left), but what worries me is the dark band at the bottom. The pattern does not change if I use APT or the canon EOS utility or if I manually depress the shutter button... any idea about what could it be?
Thanks a lot!
Posted 29 September 2013 - 11:58 AM
Posted 29 September 2013 - 07:42 PM
Also check the shutter isn't jamming or you have the viewfinder fully covered. Cannon give a little rubber shoe to fit over the viewfinder...you can use this or tape.
Also try to take "darks" with aluminium foil over the lens cap. A lot of plastic caps pass infrared which can be seen on the sensor as photons.
Hope this helps
Oh one last thing...check the mirror lockup is fully going up out the light path way.
Posted 30 September 2013 - 03:43 AM
thanks a lot for the link: I was aware of both the mirror lockup and the "live view" issues, so I disabled the ML on the camera side and on APT and did not shoot using "live view". However, I still get that dark band at the bottom of every image I take... I am still using "virtual" exposure control, might that be the culprit?
Interesting point the aluminum foil, I will try again with better light shielding.
Posted 01 October 2013 - 05:56 PM
Posted 01 October 2013 - 06:02 PM
Posted 01 October 2013 - 07:00 PM
My hunch is also that the shutter isn't opening all the way because of how it was modified. The modifier should fix this.
Posted 02 October 2013 - 01:13 AM
Also check the flip mirror is fully moving up out the way. It does look like a light leak around the flip mirror.
Other than that...it's back to the modifier.
Posted 02 October 2013 - 01:15 PM