does the owl perch somewhere you could put some food? They aren't stupid, if you go out and put food down every night at the same time, then sit and wait at a distance and quietly, they will get used to you and associate you with feeding...now is a good time cos soon there will be babies to feed and the work hots up. Once he or she is associating you with food and will come for the food while you are around, you can get your shot. Make sure you turn off anything on the camera that beeps, pings whistles clicks or flashes!
To get a good Pic of the Owl you would need a Tripod mounted Camera with Zoom lens plus a lot of patience. When it's very dark it would be almost impossible without infrared to get a viewable pic.
See it tamborine, that's not bad at all with a basic Camera. What Owl species is that as I don't recognise it as one of the UK Owls ? Are you living abroad ?
Is there anything you can have as a light trigger, might take patience for them to get used to it though and not see it as a threat.
My parents had badgers in their garden and would put food outside the shed at the top of the garden for them (it's quite a long garden so fair way from the house). They would trigger the security light from the shed so we would go up into the garden facing upstairs room and get to watch them.
Have you got a high ISO setting on your camera to counteract the bad lighting and negate the use for flash? Could work with a sports setting to capture movement. Zoom could also be an issue depending on how far away it is.
Do you know anyone with a higher spec camera with a zoom and tripod and decent ISO settings etc... who could help out if it's a regular visitor? Even a local wildlife photography who might come for the opportunity in return for a nice picture.
Another possible is using a video function from which you could take a picture still.
I find that when taking videos on my digital camera, especially in low light conditions, provides a good still which is actually much better lit than the photos I've taken.
To try and focus a little better, try and focus on the eyes and, if you have time, play with the shutter release to help the camera focus in properly and keep it as still as you can (or take full advantage of any anti-shake function).
I was playing around with my camera the other weekend trying to take photos of birds in my parents' garden, on the fence and bird table and that was hard enough in the light with the movement.
The owl isn't taking the feed so am stewing the venison. Instead am dropping mouse feed on wood pile; that should bring the owl down to feed on the mice. It's still stalking me so have made it a nest box in a stable.