Nabil-A wrote:
jwcdds.
Can you explain?
Also just a observation from my G6, but when in low light and in TV mode, half pressing the shutter doesnt display what the typical image look will be. Wondering if there has been away to do this or if it is an issue canon can look at?
Not exactly sure what you'd like me to explain... the difference in OVF?
If you look through the OVF of an SLR/dSLR, in essence, you're seeing most (if not all) of what the sensor will see. This is in reference to the framing, overall field of view. The same is true, actually better, with EVF's. This is because the image on the EVF/LCD comes directly from the same sensor that will capture the photo.
This is also the case when you compose/shoot with the LCD live view turned on on any p&s/prosumer camera because the image comes directly from the sensor. The downside is that in bright daylight, it is much harder to see the LCD clearly. But with cameras that have a built-in OVF (but not TTL, or through-the-lens), there will always be some discrepancy to what you see through the OVF and the final image. The difference is greatly reduced when objects are far away, but much more pronounced when objects are close to the lens.
For example, hold your thumb a foot away from your nose. Imagine your right eye being the lens, and your left eye being the offset OVF. Now cover your right eye (lens) and look at your thumb with your left eye. Then cover your left eye (offset OVF) and look at your thumb with your right eye. You'll notice that the two images are not the same.
The advantage of the offset OVF is that it doesn't require a constant power drain, and that in very low-light, you can still see through it and discern objects fairly well (although this doesn't guarantee accurate focus as focus is still determined by the sensor).
Personally, I like EVF's. You can already see many manufacturers ditching the offset OVF altogether with their smaller compact cameras already. Offset OVF are slowly being phased out (IMO).