Trouble with Nikon D750
Dec 29, 2021 15:14:54 #
I was wondering if anyone has experienced focus issues.
It was a couple of days before Christmas well, (MY Christmas due to my work schedule) and I fired up the 750 with the 24-120 mm to take pictures of our annual scavenger hunt. It wasn't cooperative.
Autofocus settings seem as they have always been but when I engaged the back button focus the lens went to infinity, then to the opposite side (0.45 m) and then back to infinity where it stopped.
I took the lens off, cleaned the contacts, checked the settings again and put it back on. No difference. I then changed to the 50 mm and it properly focused once and then did the infinity to 0.45 m thing.
If more information is needed, I will be happy to provide it.
Thanks,
Mike
It was a couple of days before Christmas well, (MY Christmas due to my work schedule) and I fired up the 750 with the 24-120 mm to take pictures of our annual scavenger hunt. It wasn't cooperative.
Autofocus settings seem as they have always been but when I engaged the back button focus the lens went to infinity, then to the opposite side (0.45 m) and then back to infinity where it stopped.
I took the lens off, cleaned the contacts, checked the settings again and put it back on. No difference. I then changed to the 50 mm and it properly focused once and then did the infinity to 0.45 m thing.
If more information is needed, I will be happy to provide it.
Thanks,
Mike
Dec 29, 2021 15:26:19 #
Mike D. wrote:
I was wondering if anyone has experienced focus is... (show quote)
Are you ensuring you have a good 'target' for the AF to lock on to?
Which AF area mode are you using, single, dynamic or auto?
Dec 29, 2021 15:26:51 #
Were you pointing the camera's AF 'bullseye' toward something that the AF system could not comprehend? Such as the sky, or another plain feature?
Dec 29, 2021 15:38:55 #
Mike D. wrote:
I was wondering if anyone has experienced focus is... (show quote)
Try Matrix or even Spot Metering.
Dec 29, 2021 16:15:58 #
Dec 29, 2021 16:38:21 #
Grahame wrote:
"Metering"?
Well exposed out of focus frames. Isn’t that what we want ?
My personal guesstimated diagnosis is dust in the SLR focus sensor. If the SLR sensor is failing to focus, the LV AF should still work perfectly. If the LV AF also fails, then it’s either user error or repair time.
One way to check for user error is to dial into one of the custom user modes. Those should not include any recent settings that might be user errors, and so the AF would work OK. If the same AF problem persists even in the custom user mode, repair is probably needed.
Dec 29, 2021 17:06:42 #
User ID wrote:
Well exposed out of focus frames. Isn’t that what we want ?
That was also my immediate thoughts when trying to fathom out why exposure metering would be considered as a possibility by 'Nikaroo'. Then again, low light can cause focus problems.
User ID wrote:
My personal guesstimated diagnosis is dust in the SLR focus sensor. If the SLR sensor is failing to focus, the LV AF should still work perfectly. If the LV AF also fails, then it’s either user error or repair time.
Yes, that's a good possibility and as with all focus problems there's always a logical way to diagnose them, starting from confirming the obvious and moving forward.
Dec 29, 2021 21:35:50 #
The lighting doesn’t change what the lens does. It goes from one end of the scale to the other and stops on infinity.
I thought that changing some of the settings might help but it still does the same thing.
It is currently set for AF-C because of the BBF.
I thought that changing some of the settings might help but it still does the same thing.
It is currently set for AF-C because of the BBF.
Dec 29, 2021 22:10:38 #
Mike D. wrote:
The lighting doesn’t change what the lens does. It goes from one end of the scale to the other and stops on infinity.
I thought that changing some of the settings might help but it still does the same thing.
It is currently set for AF-C because of the BBF.
I thought that changing some of the settings might help but it still does the same thing.
It is currently set for AF-C because of the BBF.
Currently ?
Does AF-S work ? If it does, I’d change my guesstimated diagnosis. Crud in the SLR AF module should screw up AF-S about as bad as AF-C, mebbe a bit less.
Dec 30, 2021 01:20:04 #
Grahame wrote:
Are you ensuring you have a good 'target' for the AF to lock on to?
Which AF area mode are you using, single, dynamic or auto?
Which AF area mode are you using, single, dynamic or auto?
It is currently set for spot (single) but fussing with that hasn’t changed its head trip either. It’s annoying.
Dec 30, 2021 01:21:36 #
twowindsbear wrote:
Were you pointing the camera's AF 'bullseye' toward something that the AF system could not comprehend? Such as the sky, or another plain feature?
Nope, I’ve tried pointing it at different things with different lighting and it still goes from one side to the other and stops at infinity.
Dec 30, 2021 06:15:54 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
Mike D. wrote:
I was wondering if anyone has experienced focus is... (show quote)
Call the professionals at Nikon, 1-800-645-6687
Dec 30, 2021 06:17:39 #
I have the same set-up, D750, 24-120 f4. Usually use single point focus, AF-S. Never used the BBF, never had this problem in 4 years of shooting. Could be something simple. Take out the battery, make sure it is charged, put it in, change to AF-S, don't use BBF, focus in good light on a contrasty subject. All else fails, call Nikon. Good luck, keep us posted. (Could the BBF button have gone funky?)
Dec 30, 2021 10:04:34 #
User ID wrote:
Well exposed out of focus frames. Isn’t that what ... (show quote)
I will definitely investigate your suggestions, it will narrow down the user/hardware errors.
Dec 30, 2021 10:06:19 #
Grahame wrote:
Yes, that's a good possibility and as with all focus problems there's always a logical way to diagnose them, starting from confirming the obvious and moving forward.
Indeed, thank you all for your suggestions. I really would like to avoid sending it in but if that’s what needs to happen, so be it.
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