How to Turn on Continuous Autofocus on Nikon D3100
05-28-2017,08:55 PM #2
Staff
Re: D3100 will not autofocus
I don't know much about the D3100 (you tried everything I would have thought to suggest), so I'm only able to offer you a "howdy" and welcome to Nikonites!
05-28-2017,09:05 PM #3
Senior Member
Re: D3100 will not autofocus
What lens? If it's a lens that requires a body motor, it won't AF on a 3100 since it doesn't have one.
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05-28-2017,09:07 PM #4
Junior Member
Re: D3100 will not autofocus
The lens has the motor, the focus ring spins when trying to achieve focus but does not, but it is a 50mm 1.8G AF-S also tried my 18-200mm with same results
05-28-2017,09:22 PM #5
Senior Member
Re: D3100 will not autofocus
On the camera body, down by the lens-release button, there's a switch to enable/disable auto-focus; that switch needs to be in the "A" position.
Originally Posted by hrussell007
With camera and lens in AF it will not achieve focus. The focus rings spins all the way to one side
then all the way back past infinity and stops.I've tried all focus modes and points, cleaned inside camera, tried back button focus & the lens works
perfect on my D7100 so nothing wrong with the lens, I've also reset all modes to factory.Manuel and live view focus works fine, just not autofocus in the viewfinder.
Any thoughts?
Have you checked that?
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05-28-2017,09:23 PM #6
Senior Member
Re: D3100 will not autofocus
Welcome aboard. Enjoy the ride.If two lenses work fine on another camera, but not on your D3100, it sounds bad. Sorry, but otherwise I am in the same boat as Rocket Cowboy and can't offer any more suggestions.
Last edited by Bikerbrent; 05-28-2017 at 09:26 PM.
Brent: Poway, CA
D7200, D200, F100
Tokina 12-24mm
Nikon 18-200mm
Tokina 28-70mm f2.6-2.8
Nikon 80-200mm f2.8
Sigma 150-600mm
Nikon 50 AF f1.8
Tokina 100mm f2.8 Macro
Nikon SB800
Giotto MT8180 Heavy Duty Tripod
Manfrotto 3016 Mono-pod
05-28-2017,09:30 PM #7
Junior Member
Re: D3100 will not autofocus
D3100 does not have that button but yes the camera and lens are both in AF.
05-28-2017,10:04 PM #8
Senior Member
Re: D3100 will not autofocus
Try a factory reset on the camera.
Don't mind me... I'm out roaming around somewhere between Zone III and VII.
My Website.
Go forth and actuate!
05-29-2017,02:02 AM #9
Senior Member
Re: D3100 will not autofocus
Just out of curiosity, does the 'in focus' dot in the view finder light up when you manually focus? Half pressing the shutter button while manually focusing will enable the dot to light when the selected focus point sees focus. This camera sounds broken especially since you have tried everything. Live view uses a completely different method to determine focus but it does tell you that the motor can be controlled properly.
I must have a really good camera.
05-29-2017,02:28 AM #10
Junior Member
Re: D3100 will not autofocus
Just out of curiosity, does the 'in focus' dot in the view finder light up when you manually focus? Half pressing the shutter button while manually focusing will enable the dot to light when the selected focus point sees focus. This camera sounds broken especially since you have tried everything. Live view uses a completely different method to determine focus but it does tell you that the motor can be controlled properly.
No, it does not stay steady, just keeps flashing. So I guess that means the camera can't even tell it's in focus when it is. Figured it would need repair but was hoping that I just missed something or somebody had a little trick.
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Source: https://nikonites.com/d3100/39477-d3100-will-not-autofocus.html
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