Problem - less sharp image on 300D

[raylks]

Did you encounter the same problem?

I have the 300D on hand, and frequently use it with my EF17-40mm L lens. When comparing one image in landscape format, and one in portrait format, shooting with the same setting the image is sharper in the latter format!

I found that this happens when I use long exposure with a tripod. (I always shoot for long exposure time with a tripod). So I wonder whether it is caused by the shake motion caused by the rise up of mirror when I press the shutter.

My later findings find that with the same lens attached on 350D, no such problem occurs.

[Jesper]

I guess you see the difference when you're looking at the image on your monitor? How does it look if you rotate a landscape image 90 degrees - does it look the same as the portrait image or do you still see the difference?

[Andy_T]

maybe your tripod head is less stable when tilted.

Otherwise, your problem sounds a bit weird.

Best regards,
Andy

[JusSmith]

You will see more pixels on a landscape picture on a landscape monitor, so it will show more imperfections. If you have one of these A4 (letter in US) monitors then the landscape picture will seem sharper.

[cmM]

I guess you see the difference when you're looking at the image on your monitor? How does it look if you rotate a landscape image 90 degrees - does it look the same as the portrait image or do you still see the difference?
ROFLMAO!!! :D:D:D

raylks, that shouldn't happen. Maybe because of wind, or maybe you have a shaky tripod

[robertwgross]

I would stick with the shaky tripod theory.

---Bob Gross---

[raylks]

But when I shoot in landscape format with my 350D on the same tripod, there is no such problem.
Perhaps my tripod doesn't like my 300D.

I need to check my tripod. I know that the weight of 300D and 350D is different. The weight difference may explain my case.