a new camera, the EOS 450D, probably a new eyepiece made necessary acc. statement of Canon support. The old EP-EX15 is no longer compatible with the 450D. But Canon assured me that the new EP-EX15II fits on all other EOS cameras. But all other features described below are the same for both versions.
EP-EX15II is something strange and I think also unique; Only Canon has this accessory. Why are brought to an Extender? Now the effective visible image to be recorded will not greater but smaller. But it has the advantage that the entire 'finder' is bigger. That's the image that includes the information about shutter speed, aperture, ISO speed, etc. Eyeglass wearers by some further removal of the eye from the eyepiece / eye cup has the disadvantage that the black border to the bottom line of information, or even just the edges of the picture are mostly limited visible here helps the eyepiece. Whether this is an advantage for you, however, can only answer them yourself.
A clear advantage for all is the fact that the nose no longer sticks by the extension to the rear, on the LCD screen. The EOS 1D models have already been equipped so that the eyepiece has been constructed as far back as it makes up for the above-mentioned advantages of the EOS xxD and xxxD Series sense. Neudeutsch said: "Pimp My Camera" ;-)
In principle, very well made, but you should be careful when it is removed again since. The two hooks on the back, which serve to lock, can not hasty slimming withstand. But even with a hook he still holds enough :-)
I thank you - you have found mistakes? If you have something unclear? Know more facts? If so, please take this opportunity to write to me.