Canon 600D diopter adjustment

[gblades]

I wear glasses which are about a -6.5 prescription in each eye. I have found that while wearing the glasses I have to set the diopter adjustment all the way to -ve in order to get a clear view. At that setting it is perfectly in focus.
I would have thought as I am wearing glasses which have corrected my visio the diopter should be set to a neutral setting on the camera.

Am I wrong about this or is there some misadjustment in my camera?

Thanks
Gareth

 

[Splog]

Have you tried it without glasses?

 

[TinaC]

I wear glasses which are about a -6.5 prescription in each eye. I have found that while wearing the glasses I have to set the diopter adjustment all the way to -ve in order to get a clear view. At that setting it is perfectly in focus.
I would have thought as I am wearing glasses which have corrected my visio the diopter should be set to a neutral setting on the camera.

Am I wrong about this or is there some misadjustment in my camera?

Thanks
Gareth

I'm not good at the physics, but my experience is exactly the same. I think it has something to do with our very poor natural vision. I'm sure an optical physicist will be along soon

 

[gblades]

Without glasses I can tell there is something green lighting up near the bottom but thats about as good as it gets

I have the 28-135 IS USM lens and I did an experiment where I stood about 3M back from the back of a food container which had about 2mm high cooking instructions on the back. I set the lens to 135 and took a photo with the flash on the fully auto setting (1/60 5.6) and when fully zoomed in the text was readable but not perfectly focused. Handheld at that magnification I think thats perfectly fine so nothing wrong with the camera itself.