Opticallimits

http://forums.dpreview.com/forums/read.a...e=40162407

http://forums.dpreview.com/forums/read.a...e=40166853



Not good.

Yes; the auto focus system on the 5n (and probably 7) require quite a bit of light and generally is quite slow (not nearly as good as the ep-3). However, the beauty of these cameras is that they make it easier to manual focus (though the average consumer might not buy that as a viable alternative0.

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Here is a quote from dpreview of the 7 (someone else dug it out but i think it explains the the issue):



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"One weak point of the NEX-7's AF system is when used indoors under artificial lighting, which tends to present a tricky combination of low light and relatively low contrast. At this point focus speed drops right down, and the camera has a tendency to fall back on its 'large green rectangle' mode - in essence analyzing almost all of the frame to acquire focus. The problem here, aside from speed, is accuracy - the camera has a tendency to focus on the background, so you may well need several attempts to get correct focus. In our assessment the NEX-7 is being outperformed by current Micro four Thirds cameras in this respect, even when using a fast lens like the Carl Zeiss 24mm F1.8 - however it's probably still a bit better than the Fujifilm X100."

[quote name='Sammy' timestamp='1324998026' post='14144']

[url="http://forums.dpreview.com/forums/read.asp?forum=1042&message=40162407"]http://forums.dprevi...essage=40162407[/url]

[url="http://forums.dpreview.com/forums/read.asp?forum=1042&message=40166853"]http://forums.dprevi...essage=40166853[/url]



Not good.

[/quote]



Hmmh, I had no problems with the old 5.

"One weak point of the NEX-7's AF system is when used indoors under artificial lighting, which tends to present a tricky combination of low light and relatively low contrast."



This "relatively low contrast" assessment may be slightly optimistic - the guy who described his troubles over at dpreview couldn´t properly focus on a Christmas tree, which is a pretty contrasty motif. Kind of bizarre that a cam, which is a top performer at high ISO settings, fails to focus indoors.

[quote name='you2' timestamp='1325007307' post='14147']

"... however it's probably still a bit better than the Fujifilm X100."

[/quote]



Well, I took a number of christmas pictures with the X100 ... I had

no trouble with the AF at all. From hearsay ... the AF of the X100

seems to have improved with the latest firmware version.

[quote name='you2' timestamp='[url="tel:1325007307"]1325007307[/url]' post='14147']

Yes; the auto focus system on the 5n (and probably 7) require quite a bit of light and generally is quite slow (not nearly as good as the ep-3). However, the beauty of these cameras is that they make it easier to manual focus (though the average consumer might not buy that as a viable alternative0.

--



Here is a quote from dpreview of the 7 (someone else dug it out but i think it explains the the issue):



--

"One weak point of the NEX-7's AF system is when used indoors under artificial lighting, which tends to present a tricky combination of low light and relatively low contrast. At this point focus speed drops right down, and the camera has a tendency to fall back on its 'large green rectangle' mode - in essence analyzing almost all of the frame to acquire focus. The problem here, aside from speed, is accuracy - the camera has a tendency to focus on the background, so you may well need several attempts to get correct focus. In our assessment the NEX-7 is being outperformed by current Micro four Thirds cameras in this respect, even when using a fast lens like the Carl Zeiss 24mm F1.8 - however it's probably still a bit better than the Fujifilm X100."

[/quote]





I can confirm the behavior ... very odd.

Perhaps not the right thread; but give us some preliminary feedback on the 7 - esp as it compares to the 5n <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />

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One complaint I did read about the 7 was that with the 5 it rest against your nose so it has less shake; where as the 7's position of the viewfinder mean that it does not touch the face and is more prone to shake (just repeating what I read; no clue if it is true).



[quote name='Klaus' timestamp='1325282395' post='14200']

I can confirm the behavior ... very odd.

[/quote]

[quote name='you2' timestamp='1325007307' post='14147']

"One weak point of the NEX-7's AF system is when used indoors under artificial lighting focus speed drops right down,....[/quote]

[quote name='Klaus' timestamp='1325282395' post='14200']

I can confirm the behavior ... very odd.

[/quote]

....shouldn't have sold the 7d <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/rolleyes.gif' class='bbc_emoticon' alt='' />

[quote name='asnwd' timestamp='1325371068' post='14211']

....shouldn't have sold the 7d <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/rolleyes.gif' class='bbc_emoticon' alt='' />

[/quote]



You can use the LA-EA2 ...

[quote name='Klaus' timestamp='1325442365' post='14216']

You can use the LA-EA2 ...

[/quote]



... yes, and fortunately i've found that the za's seem to be better at looking thru panes of glass than almost anything else ....



<img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/rolleyes.gif' class='bbc_emoticon' alt='' />