I've recently purchased a 350D specifically to take Jewellery photography. I
have a Canon EFS 60mm Macro lens and also a light tent.

I've been experimenting taking photo's but I noticed that on opening up the
aperture to 32f and at 8"the captured image recorded what looked like a hair
running from top to bottom on the left hand side of the image about a ¼ of
the distance from the left. Moving the camera in various positions and also
inspecting the lens for a hair or debris did not change anything. The line
is not straight but is best described as a smooth bolt of lightning but dark
like a hair.

So I have tried various methods to eliminate the problem.  Using 10f at 1"
yielded the same recording but the 'hair' shifted along to the right a bit.
20f at 4" moved it along a bit further and 32f at 10" it was the same
position as 20f at 4". 32f at 2" was showed the now line just further than
the middle of the picture.

I have also changed the lens experimenting with different values but with
similar results. The only thing I have noticed is that the line cannot be
seen when using a small aperture.

I have also tried covering the viewfinder.

The only thing I have not done is clean the sensor which I am a bit wary due
to the newness of the camera and the warnings of easy damage.

Any helps or advice would be greatly appreciated.

TIA

Jerry

London