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For the same framing using a smaller (APS-C) sensor, you need to be further from the subject, or use a shorter lens.
QuoteThe main reason that a larger sensor means shallower DoF is that for the same framing with a smaller sensor, you need to either be further from the subject, or use a longer focal length, either of which means deeper DoF.
shorter
Granted, but if you take it to the extreme, a system with only a single point would mean you wouldn't have to change at all. The choices you would have to make are simpler, you simply have to make a choice on what depth of field you want and what composition, you wouldn't need to worry about focusing at all, as you'd get what you were given. By definition, any system that gives you more options is more complex. Whether or not any one individual finds it complicated will depend on their prior experience and their ability to adapt to the greater degree of choice. For some people, the 7D system is stil relatively simple, while for others, it is more than they can cope with (either in reality or because they can't or don't want to take the time to learn it).The simple fact that there are more points to choose from means it is more complex, after all, many people never change from the central point. But beyond that, there are a lot more focus modes to choose from and choosing the wrong one can change the behaviour and cause focusing errors. Many who aren't aware of the complexities, may simply choose the default of all points and find that it focuses on the nose of a person, instead of their eyes, they may then think that the camera AF isn't working properly. In comparison, if they had used the spot focus mode and chose an off centre point, then they could have had the eyes correctly in focus. It's the same with wildlife, you either get the wing tip (potentially) or the head. It's fine if you understand that, as most on here do, but many using the 7D for the first time (especially if it also happens to be their first camera), may not be aware of that. Whenever you increase versatility, there is always the chance of increased complexity.Which focus mode are you using? Spot, Single point, expanded, zone or all points? Also have you adjusted the tracking sensitivity or is it still at the default setting. The focus modes on the 7D are much more complex than other consumer and semi-pro cameras and it is only the 1D/1Ds series that are more complex. If you don't use the best mode for the job, then it can be erratic, so we need to rule that out as a cause first.
I dont believe they are more complex - just more points to choose from - that includes the 1D series as well
To me the complexity is the same for all the current digitals - you move the focus point to the right place and take the picture.
The only differences comes when you get the configuration options such as expansion points and tracking sensitivity.
Operator ignorance is nothing to do with the camera - whether there are 9 points, 19 points or 41 point is just giving the user finer granularity.
The simple fact that there are more points to choose from means it is more complex, after all, many people never change from the central point. But beyond that, there are a lot more focus modes to choose from and choosing the wrong one can change the behaviour and cause focusing errors. Many who aren't aware of the complexities, may simply choose the default of all points and find that it focuses on the nose of a person, instead of their eyes, they may then think that the camera AF isn't working properly. In comparison, if they had used the spot focus mode and chose an off centre point, then they could have had the eyes correctly in focus. It's the same with wildlife, you either get the wing tip (potentially) or the head. It's fine if you understand that, as most on here do, but many using the 7D for the first time (especially if it also happens to be their first camera), may not be aware of that. Whenever you increase versatility, there is always the chance of increased complexity.Which focus mode are you using? Spot, Single point, expanded, zone or all points? Also have you adjusted the tracking sensitivity or is it still at the default setting. The focus modes on the 7D are much more complex than other consumer and semi-pro cameras and it is only the 1D/1Ds series that are more complex. If you don't use the best mode for the job, then it can be erratic, so we need to rule that out as a cause first.
I dont believe they are more complex - just more points to choose from - that includes the 1D series as well
I disagree.
The 7D has the best APS-C sensor currently offered by Canon. The features that differentiate it from the lower models are build, AF, fps, etc.
If the 7D had a larger sensor - even slightly larger - the image circle of EF-S lenses would not cover it. So...bad idea.
neuroanatomist: I recently went out shooting for a week with my brother inlaw. He has a 7d and a 24-70. I have a 550d and Tamron 17-50. Over the week we exchanged cameras several times for hours at a time. I expected his 7d+24-70 to blow the 550d away. Well, I was in for a surprise. Overall, the 550d + Tammy where at least as good as the 7d. I would even dare that in some cases they where better. When shooting at night in low light on a tripod, the 7d took quite a few seconds to digest each shot - the 550d was much quicker?
Bottom line is (my impression) that placing aside all of the 7d's pro qualities as far as AF, body, etc. from a pure IQ point of view - I saw no large advantage - and even seem to feel a certain annoying softness in the images.
Strange ? Can you comment?
I take photos mostly while traveling.
When I am back home I am too busy with work to do PP.
So, I've just shot in jpg but I want to change that.
Would anyone here be able to explain what it really is that the 7D does differently from the 5D that makes it so much better? Like many people here (probably), I learned to take pictures with a manual camera, and I am still surprised that the camera will do all that work for me. I don't understand why more "focus points" is any better.More focus points isn't necessarily better, but if all of those points work well, then it gives you more options compositionally. If only the centre point is reliable, then you have to focus and recompose. This can cause problems in two main ways. The first is the more obvious, in that you can miss the moment while recomposing, but the second is potentially a greater problem. Many lenses (but by no means all) suffer from a change in the focal plane if you recompose. This is ok at narrower apertures, as the depth of field will mask the focus inaccuracies, but with the wide aperture lenses, the depth of field can be extremely narrow, resulting in out of focus images. The only option then is to manually focus or put up with a low hit rate and of course, in low light, manual focus is awkward. Essentially, you could say then that more usable focus points are better.
