Canon 1Ds Mark III image misalignment
A problem with viewfinder/sensor alignment?
I've seen a couple of DPR posts over the last few days mentioning that the view that you see in the viewfinder is not matching up with what's taken. There is a noticeable tilt in the viewfinder
I decided to do a quick test with my 1Ds3... (608xxx)
Latest news
21st August 08
Shipped back by UPS, the camera is back with me.
So, Kudos to Canon Service UK for their very prompt and efficient return of my camera!
FULL REPORT of repairs
18th August 08 I've just taken the camera in to Canon UK Service in Elstree. I was told there was a chance it would be back this week. We'll see ;-)
This is my first ever contact with Canon service, so I'm keen to see how they do... you can rest assured that when it's back I'll be giving the camera a careful check.
In the mean time, the batteries are freshly charged and my 1Ds gets its week or two in the sun. With no jobs requiring high ISO or really high resolution booked for a few weeks, I thought it best to get the camera fixed before heading off to Colorado at the end of September.
15/1/08 - It's a 'Prism assembly realignment' that's needed. I've now heard from someone who's had it done by Canon (24hr turnaround)
8/1/08 - I've added a pair of images from another 1Ds mk3, which show the effect even more
3/1/08 Canon UK have suggested that the camera is sent back to them for adjustment. I'll have to see how much irritation it is in real use, but they've said it would be covered by warranty, so I've got a while to decide :-)
Since I do a fair bit of architectural, landscape and interior photography I've fitted the EcD ruled focusing screen to my 1Ds3 (it's the one I've used very sucessfully with my 1Ds for a few years)
This is the test setup. I'm using my 90mm TSE lens (very sharp and very little distortion)
It's fine graph paper, with a single line ruled in black to make things easier to see.

I'd fitted the EcD ruled focusing screen

I checked the seating of the screen several times and there was no variation in results.

Here's the resulting image

Using Photoshop I get an estimate for the tilt of about 0.4 degrees
Since I generally reckon I can see a tilted horizon on a print if it's more than ~0.25 degree out, then it just isn't good enough... :-(
Just for good measure, here's the liveview view, and in the original, that 0.4 degree tilt is easily visible

In the month I've had the camera, this hasn't been a problem, but that's connected with the types of work I've done over the last month...
Given I put the ruled screen in place to minimise the amount of 'fixing' I'd need to do in PS, I'll be on the lookout for a solution. I'm not yet read to try and file down the edge of the EcD screen though...
8th January
This is someone else's 1Ds3 which shows the effect even more than mine above.
Canon in the US said to send the camera back for adjustment. Not something I'd expect to have to do for a camera this price...

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