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Quick AF Validation Test

brosen

Plymout, US
61 posts

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brosen Silver Member Nikonian since 24th Sep 2009
Tue 25-Sep-12 02:03 AM

Today I did a quick test using a Nikon 28mm f/1.8G Lens with an Aperture of f1.8, at a distance of 2.3 feet. What do you think about the results ?, thanks

LEFT

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CENTER
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RIGHT
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Attachment#1 (jpg file)
Attachment#2 (jpg file)
Attachment#3 (jpg file)

Bernard

D800E
28-300, 24-120, 105 Micro, 85G, 50G, 28G
SB-910

Mushimo

US
6 posts

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#1. "RE: Quick AF Validation Test" | In response to Reply # 0

Mushimo Registered since 22nd Sep 2012
Tue 25-Sep-12 01:38 AM

I"m no expert but the left looks slightly off.

Hawk Eyes

US
167 posts

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#2. "RE: Quick AF Validation Test" | In response to Reply # 0

Hawk Eyes Registered since 09th Jun 2012
Tue 25-Sep-12 02:59 AM | edited Tue 25-Sep-12 09:15 AM by Hawk Eyes

Sorry to be so blunt. But why would you have to post a chart picture that clearly shows a out of focus left sensor and ask what we think. It is old news that some sensors have a left focus problem.
If you need people to tell you what they think about the left focus issue just TYPE IN THE SEARCH BUTTON IN THE RIGHT CORNER OF THIS PAGE " D800 LEFT FOCUS ISSUE". You will get everything you need to read about what people think about the left focus sensor.
Good luck

true_superfly

US
116 posts

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#3. "RE: Quick AF Validation Test" | In response to Reply # 0

true_superfly Registered since 27th Mar 2012
Tue 25-Sep-12 03:57 AM

This test was done on your brand new D800E, right?

Have you tested all your other lenses yet? Or just this 28mm f/1.8G has this left-focus problem?

KnightPhoto

Alberta, CA
4955 posts

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#4. "RE: Quick AF Validation Test" | In response to Reply # 0

KnightPhoto Gold Member Nikonian since 18th Dec 2006
Tue 25-Sep-12 08:10 AM

Are you seeing this repeatedly? I'd want to make sure this is an every time situation...

Best regards, SteveK

'A camera is an instrument that teaches people how to see without a camera.' -- Dorothea Lange
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venusian

US
186 posts

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#5. "RE: Quick AF Validation Test" | In response to Reply # 4

venusian Registered since 17th Dec 2008
Tue 25-Sep-12 09:18 AM | edited Tue 25-Sep-12 09:42 AM by venusian

Brosen, Thanks for the post.

The left focus does appear to be off.

Can you explain how you did the test a bit more? Were the 3 targets lined up side by side on a wall? Or did you have a single target that was shot with the individual center, left-most and right-most focus points? Did you rerack the focus before each new shot? Also, where did you get the test target used for the test? Is it downloadable from the Internet?

Thanks!

Nick (Roxbury, Connecticut Nikonian)

FutureLook

Miami, US
598 posts

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#6. "RE: Quick AF Validation Test" | In response to Reply # 0

FutureLook Silver Member Nikonian since 29th Dec 2003
Tue 25-Sep-12 10:26 AM | edited Tue 25-Sep-12 10:29 AM by FutureLook

With all due respect, I do not see any entries in your profile. Could you please fill out your profile if you don't mind? This perhaps would add more credibility to your claim.
As another colleague states, it is clear that the left focus is soft, so why do you ask others for their opinion is kind of strange. If I were you, I would send the camera back to Nikon with these samples for them to take care of this situation. It is old news at this point that there D800/D800Es with focus problems. However, there are many of us fully satisfied with our camera right of the box.
Respectfully, I am going to give you my humble opinion. "Send the camera back to Nikon".

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outdoors4me

US
246 posts

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#7. "RE: Quick AF Validation Test" | In response to Reply # 6

outdoors4me Silver Member Nikonian since 16th Nov 2009
Tue 25-Sep-12 12:22 PM

To the poster's defense. It could be that his eyes are as bad as mine. It took me a couple of looks at his chart to see the difference.

And while I do see that there is a difference, and maybe he does too - he might want comments regarding how bad it's off compared to others that have had the problem.

Beck

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brosen

Plymout, US
61 posts

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#8. "RE: Quick AF Validation Test" | In response to Reply # 7

brosen Silver Member Nikonian since 24th Sep 2009
Tue 25-Sep-12 04:25 PM | edited Tue 25-Sep-12 04:32 PM by brosen

Just as a clarification, I was looking for feedback regarding how bad it is based on the experts opinion, I am not one. From my personal perspective it's not that bad in order to return it or send it in for repairs, I can live with it.

Something interesting that I discovered today, when I took the pictures I had enabled Light Optimizer and Lens Correction (something like that), I did new tests today with those parameters disabled, and the result are much better, I am going to post those photos later today.

Thanks for all the feedback.

NOTE:

- The test was done with a D800 S/N: 3043XXX
- I've tested with other lenses 50 f/1.8G, 85 f/1.8G, 105 f/2.8G and the results are much better with larger focal lengths.
- I used 3 targets, one per each focal point
- I've done the test multiple times using a controlled environment with a tripod
- At larger focal length I would say there is no visible problem (human eye)

Bernard

D800E
28-300, 24-120, 105 Micro, 85G, 50G, 28G
SB-910

G