The future of the 6D line

Started Nov 14, 2012 | Discussions thread
(unknown member) Veteran Member • Posts: 5,590
Re: The future of the 6D line

PhilPreston3072 wrote:

meland wrote:


PhilPreston3072 wrote:

Why does the 6D have only 1 Cross Type AF point? Even the lowly 650D/T4i has 9 cross type AF points inherited from the 60D.

Perhaps it's an exceptionally good single cross type AF point. As a scientist you probably appreciate that more is not always better.

It's just odd that every camera in the range from 650D to 1Dx has multiple cross AF points except for the 6D. No doubt the central AF point on the 6D is improved for low light and would be used most, but it also wouldn't hurt to make the others cross pointed for better focus reliability. I certainly wouldn't hesitate to use the outer focus points if they were all cross type, but with the lower reliability of non-cross type focus points, I'm reluctant to use them.

For a mid level camera the 6D really doesn't give much to brag about.

Is that what you want a camera for then?

In comparison to the entry level Canons, yes. At more than twice the price of an entry level 650D, it's odd that it has less cross type AF points and a slower flash X sync. You would expect the specs to at least match the entry level model on all counts at this sort of price point.

Well not necessarily.  Let's consider the shutter first.  Any full frame shutter is going to have to cover a greater distance in the same time compared with an APS-C shutter.  For a vertical travelling shutter the distance for FF is approx 24mm compared with a Rebel's 14.8mm - in other words a 63% increase in distance.  So it's really not surprising that the flash sync is slower since the acceleration and speed of travel of the shutter blades for FF require considerably more engineering.  And when you actually compare 1/180s with 1/250s for X sync it's really quite a minor difference and not one which would have any practical impact for most photographers.

Now if we consider a cross type focus point compared with a single line type.  People seem to assume that the cross type is automatically better.  But is it?  In terms of sensitivity a state of the art current line sensor could in fact be better than a cross type of some years ago.  Of course a cross type might be better at coping with both horizontal as well vertical lines but when you start measuring away from the centre of the lens axis then cross sensors start to lose that advantage in any case.  So in those circumstances a cross sensor might not offer any practical advantage at all, although it might sound better in a set of specifications of course.

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