You have to test for both a tilted sensor and a tilted viewfinder.
first find out if your viewfinder is tilted. You have to use a
reference. Since the ultimate reference is reality, and you have to be
able to trust your tripod and the relationship of the tripod to the
camera, I would suggest the following procedure:
1. set up a vertical and horizontal grid on a wall, a large piece of
graph paper or graphical velum would work.
2. make sure that the vertical and horizontal grid is level using a
large accurate level.
3. attach the camera to the tripod which has been leveled also as
accurately as possible in orthogonal orientations. We are assuming that
as far as the camera is concerned, the base is the reference, since we
cannot adjust that, so we our making our camera reference agree with the
world reference (the grid)
4. point the camera at the grid and look through the viewfinder. If the
lines/edges in the viewfinder do not agree with the grid, then the
viewfinder is tilted.
5. take a picture and look at the result. if the picture is misaligned
with the grid, then the sensor is tilted.
6. if the viewfinder and the sensor agree with each other but not the
grid, then you may be able to compensate by the amount of the tilt with
some type of wedge on the base, but this sounds like a pain.
rg
Paul Stenquist wrote:
I guess I shouldn't be surprised. How would one test for a tilted sensor?
Paul
On Jan 29, 2006, at 9:07 AM, Bob Shell wrote:
On Jan 29, 2006, at 8:59 AM, Paul Stenquist wrote:
I haven't seen any evidence of misalignment on either of my D
cameras. What makes you think your sensor is misaligned? I would
think that an accurate test is very difficult to perform in that it
requires precise alignment of a camera and target.
Actually tilted sensors has been a very common problem in digital
cameras, all the way from the cheapest point and shoot up to the most
expensive DSLRs.
Bob
