Quote:
Originally Posted by raymo
Hi again Alistair, thankyou for your continuing interest in my problems.
As I said the other day, I'm not at home at present, and don't have
access to my images which are on my laptop there. Even if I was there I wouldn't know how to send a screen shot. Another way of describing the
noise would be to imagine horizontal rows of seismic readouts of earthquakes, but with small spikes like little tremors would produce.
Another 1100D owner recently posted about the same pattern he was getting. The lines are really close together like knitting would be.
Research is a little difficult for me, as my laptop's memory is nearly full,
so I discard pretty much all of my substandard material. I just thought of another suitable description: barbed wire with the barbs almost touching each other. Even if I don't have any individual subs showing this effect, I will presumably have some finished images showing it. I usually minimise
it by saturating the black, but that loses me other detail of course.
raymo
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hi Raymo,
are the lines anything like this?
http://i96.photobucket.com/albums/l1...talBanding.jpg
is it vertical or horizontal?
There seem to be a number of reports of vertical and horizontal banding with the 1100d.
I've never seen it with my 1000d even with 10min exposures at 20deg C, sure lot of noise, but not bands.
I would've mentioned changing USB leads but you said you save it to the card...
when you do use USB to capture, make sure it is good quality and isn't running too close to your dew heater supply cable or other power leads.
See if you can capture BIAS frames. there's a long thread in SGL where they've got some good results with just using flats and BIAS, not even darks, to remove the banding.
make sure you save as raw+jpg when using BackyardEOS and change the image type to Light/dark/bias so the files will be tagged/named accordingly.
If your stars aren't elongated, you shouldn't be discarding frames.
Cheers
Alistair