Author Topic: Sony's next generation AF module  (Read 2850 times)

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Offline REX (aka TG)

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Sony's next generation AF module
« on: August 13, 2012, 09:06:46 AM »
This is my dream/wish AF module i would like to have in my next camera.

What i wish more is to locate 3 double cross AF sensor f2,8 and the rest just to help the 3 double cross AF sensor f2,8 main sensors.

Divide the AF area in 5 groups and the left/right & middle groups can be expant as shown in the second picture.

Show us how is your dream/wish AF module :)



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Offline Faldrax

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Re: Sony's next generation AF module
« Reply #1 on: August 13, 2012, 10:34:22 AM »
I find I use the centre AF for most of my shots as it's just so reliable and fast, but when I need to switch to an alternative I can use any of the other AF points (both on A700 & A900), so for me I'd just like more of the 'other' AF points to be the double f/2.8 sensors :)

Will be interesting to see what the A99 has when it is officially released, rumours claim 102 point AF, so could be good.
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Offline Rob aka [minolta mad]

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Re: Sony's next generation AF module
« Reply #2 on: August 13, 2012, 11:34:20 AM »
Won't make the slightest bit of difference for me as 99% of my images are taken using manual focus, though having said that, the more double cross hair f/2.8 type the better. Not just for the better focussing, but that it's now almost demanded by the reviewers of cameras and consumers alike.

Rob

Offline OldClicker

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Re: Sony's next generation AF module
« Reply #3 on: August 13, 2012, 01:26:06 PM »
It is my understanding that the restriction on f/stop is the distance from the center.  Therefore, if your two ouside 2.8 can be 2.8, all of thye points inside of that can be 2.8.  But I believe that getting 2.8 that far out would be difficult. - Terry

Offline REX (aka TG)

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Re: Sony's next generation AF module
« Reply #4 on: August 13, 2012, 02:12:39 PM »
It is my understanding that the restriction on f/stop is the distance from the center.  Therefore, if your two outside 2.8 can be 2.8, all of the points inside of that can be 2.8.  But I believe that getting 2.8 that far out would be difficult. - Terry

In some way what you said i agree but only if you are using a traditional SLR.The reason i say this is because behind the main mirror we have a small mirror that reflects to the phase AF module. This reflection goes through the main mirror that in  the middle is translucent.

Now Sony doesn't need this small mirror and they can use the hole area of the translucent mirror so minimise the restriction. Now with 102 focus points they will cover more % of the screen.

The reason that they don't use too many f2,8 until today is because it is difficult for the module algorithms to decide which one will be the main and the other f2,8 helpers.

If you have only 3 AF f2,8 or 5 like Canon 1DX and divide them in groups is easier for the AF module to decide which one is the main one and the surrounding will be the helper

Now Sony with all cross 102 f4,0 AF points but no double cross AF sensor f2,8 it means you will be able to move the group where ever you like and not in fix locations like i wish/dream

From Canon 1DX


From Nikon D4


« Last Edit: August 13, 2012, 04:20:53 PM by REX (aka TG) »
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Offline Clive

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Re: Sony's next generation AF module
« Reply #5 on: August 13, 2012, 05:36:04 PM »
Oh my gosh Rex this is way too complicated for my aging brain. ;)

I take a more relaxed view..I'll let them figure i tout and then I'll use what they provide.

When I am shooting deer or birds up close it seems I can still manage to miss eye focus .. perhaps my worst error. Even with the peaking feature....still happens.

Thanks for the ideas and insights ... much appreciated.

Regards

Clive 
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Offline chappo1

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Re: Sony's next generation AF module
« Reply #6 on: August 15, 2012, 03:11:45 AM »
I am with Clive on this Rex.  Way too complex for a simple soul like me... (I have only just worked out which end of the cmera to point at the scene and which end you look through :mrgreen: )...john
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Offline REX (aka TG)

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Re: Sony's next generation AF module
« Reply #7 on: August 15, 2012, 07:20:53 AM »
I am with Clive on this Rex.  Way too complex for a simple soul like me... (I have only just worked out which end of the camera to point at the scene and which end you look through :mrgreen: )...john

Thanks all for the replies we have another 10~15 days and after that we will know what is coming and how it will work.

Personally i don't like the AF module from Top Canon neither Top Nikon.Too complicate for the user ......accelerating,decelerating,sensitivity....etc.....

Canon have placed the double cross f2,8 vertically and i find most of the occasion is usefull to place them horizontal.

Nikon have placed the cross sensors horizontally but no f2,8 neither double cross.

A mix system will be the perfect, but Sony seems to share a lot of future technology with Nikon (Nikon 51 AF points )

We already know that the a99 with 102 AF points all will be cross but no double cross neither f2,8.In the display/EVF we will have only about 51 AF points and the rest will be hitten assist like on the A900.
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