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Old Monday 20th June 2016, 14:28   #1
Musoman
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Viewfinder vs Live View

I have a slight difference in focus accuracy using both methods

I check the viewfinder and focus confirm green dot, and then try focusing using live view and find that i have to re-focus

Taking the 2 shots of the same subject using both viewfinder and then live view reveals that Live View gives the more accurate photo

It seems to me then, that the viewfinder with green dot focus confirm is slightly out.

Can i do anything about this ? Live View is too slow and clunky compared to focusing through the viewfinder
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Old Monday 20th June 2016, 15:28   #2
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Isn't that just two different screens showing the same image, and focus achieved by the same autofocus?
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Old Monday 20th June 2016, 15:49   #3
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There's no autofocus with a Refractor scope

Both Live View and Viewfinder focus require manually focusing

I was just saying that the Green Dot focus confirm in Viewfinder manually focusing, is not in the same position when switching to Live View and zoomed in to see whether Viewfinder focusing got it right, and it appears to be off slightly, with Live View needing a refocus to aquire Green Dot focus confirm
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Old Monday 20th June 2016, 15:54   #4
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Does it physically look out of focus to the eye in the viewfinder when the green dot confirms focus?

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Old Monday 20th June 2016, 15:56   #5
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No it doesn't Paul, but you dont get a magnified view in Viewfinder focusing , but without changing anything, i switch to Live View and Green Dot is off, and so i then zoom in Live View and need to slightly refocus to achieve the Green Dot
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Old Monday 20th June 2016, 16:13   #6
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I see, so you get a green dot in the viewfinder and on the live view screen? I just use the viewfinder on my Nikon D3300 and there's no focus confirm. It has live view but I've never been a fan of it.

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Old Monday 20th June 2016, 17:21   #7
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Yup Paul, thats correct.

Its just that when going to live view, which i dislike, its more accurate

I find that bit strange, unless my focusing in using the viewfinder is off, which could well be the case !
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Old Monday 20th June 2016, 17:35   #8
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Found a thread here where someone is testing and trying to come to a conclusion for the same problem with his D800. He said in live view it uses a phase detect method while in manual focus through the viewfinder it uses a contrast detect method. Further down the page though someone says it is the other way around. In one of the replies the guy says he focuses in the viewfinder until the green dot is solid and then winds back until it starts to blink and that gives him sharp results. http://www.dpreview.com/forums/thread/3592432

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Old Monday 20th June 2016, 18:02   #9
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I'll have a read of that thanks

Oh, and yes ..the someone that pointed out he got the Phase and Contrast detection round the wrong way is correct. Live View uses contrast detect and Viewfinder uses Phase detect



There's a piece here on the Nikon USA page.

https://support.nikonusa.com/app/ans...ewfinder-focus
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Old Monday 20th June 2016, 18:26   #10
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Thats was a good read and there were good pointers to try

EG..

Set camera to Live View and zoomed right in, manual focus till green dot is solid, then exit Live View and check through Viewfinder as to where the Green Dot is now.

I found, like one of the posters, that after switching form Live View to VF, that the Green Dot was missing, and had one arrow telling me that i was focused too far to the left, ( we're talking about half mm turn on the focus wheel ) so i refocused in VF till i got the Green Dot central.

Again, 2 exact same photos revealed that Live View / zoomed in and focused was more accurate than the VF.

So in future when i use the VF manual focus, if i keep the left arrow in view just before the Green Dot appears, then focusing would be as accurate as Live View

I hope that all made sense
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Old Monday 20th June 2016, 21:27   #11
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IMO, the reason is very simple: the viewfinder has a diopter adjustment and the LCD does not...
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Old Monday 20th June 2016, 22:00   #12
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I have the diopter adjusted to its sharpest, according to my eyes. But they could be the problem

Never thought of the diopter being the problem though, so will have another look at that
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Last edited by Musoman : Monday 20th June 2016 at 22:57.
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Old Monday 20th June 2016, 22:41   #13
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Quote:
Originally Posted by JGobeil View Post
IMO, the reason is very simple: the viewfinder has a diopter adjustment and the LCD does not...
If you are purely relying on the focus confirm light then the diopter adjustment isn't really going to alter the problems discussed in this thread. The focus confirm light in the viewfinder isn't as accurate as the focus confirm light in live view as the camera uses different methods to determine focus depending on what mode you are in.

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Old Monday 20th June 2016, 22:56   #14
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Yup thats me - i dont rely on my eyes only. In manual focus using the VF, i use the green dot.

AP priority

In Live View i use 100% zoom
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