I don't know what lens to get next...

[poker]

Dan....we posted at the every same time....check the time stamp.....wierd stuff...

Thank for the additional info. The info on your illustration is something I'm familiar with. I just didn't understand how a lens got measured. I guess Canon can't adjust the numbers for EF-S lenses because as you both say, "18-55 is 18-55 is 18-55."

Thank guys.....

I'm still shopping for a lens...so far it looks like two have mentioned going wider than what I got.....times 1.6 of course.

[dmm96452]

...I'm still shopping for a lens...so far it looks like two have mentioned going wider than what I got.....times 1.6 of course.

Your table says that you don't remember using the 100-300 you have now so it seems that your options are to go wider or upgrade the mid range lenses you have now.

[another view]

The focal length of a lens never changes regardless of the camera it's mounted on. If you could mount that 18-55 on a medium format camera with some sort of adapter, it's still 18-55mm. On a medium format or 35mm SLR, that lens won't cover the full frame so you'll only have a circle in the middle of the film - like what was shown above.

The reason for the 1.6x is not for the focal length, it's really more for the angle of view. IOW, 18-55 is still 18-55 but since you only have the center crop (because the digital sensor is that much smaller than the film) the angle of view is similar to that of a 29-88mm lens. You don't actually have a 29-88mm lens.