I have a D7100 & the 18 -140mm kit lens. When I try to auto focus on a low light or low dynamic range scene, using single point focusing, nothing is in focus. Is this a lens issue, or a camera issue? This image was taken yesterday. It and the other 2 from this location have this problem. All the other shots are beautiful.
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
#1
Posted 19 November 2016 - 05:53 PM
#2
Posted 20 November 2016 - 01:41 AM
The D7100 focuses using contrast and sharpness. That scene - with all the twigs and sticks - could be difficult for that camera to focus. FWIW: the posted photo looks like plenty of light to focus. I'd be curious if you had stabilization on and if you had a bit of shake.
If you question the fine focus. Try running through Dot Tune. https://youtu.be/7zE50jCUPhM
Jim
#3
Posted 22 November 2016 - 03:38 PM
You mentioned it was taken in low light which might mean a slow shutter speed was used with a wide aperture. Test again with an aperture in the lenses mid-range like f8. Mid-range values are usually sharper than wide open or completely stopped down. It might also be possible the image is not sharp due to slight camera movement during the exposure. To rule out camera movement use a tripod or place the camera on a stable surface then make the exposure with the self timer. Using the self timer will eliminate the possibility of jiggling the camera a bit when the shutter button is pressed. Its also possible wind might have caused some movement in the branches. Lots of reasons an image might not be sharp with no fault to the equipment. As mentioned knowing the exif data would help.
- TBonz likes this
#4
Posted 26 November 2016 - 07:19 AM
Is this a lens issue, or a camera issue?
If other images are sharp, the camera and the lens are probably fine. I am guessing it is just camera shake but might be many other things:
10 reasons why your photos are blurry | TechRadar
#5
Posted 22 November 2018 - 06:14 AM
All auto focus have a contrast based operation… no matter if
there is low or enough light. One can't focus on a white wall
but get a twig in there and it will react.
Also tagged with one or more of these keywords: auto focus
Camera and Photo Help →
Technical Troubleshooting →
Auto Focus not working through View FinderStarted by sherik, 02 Dec 2019 auto focus, alignment |
|
|||
Camera and Photo Help →
Technical Troubleshooting →
D850 stopped auto focusingStarted by wendyleaphotography, 03 Nov 2019 auto focus |
|
|||
Camera and Photo Help →
Technical Troubleshooting →
Unable to change f-stop. It is f0. Also no auto focus.Started by Ldunne, 30 Jul 2019 d700, f-stop, auto focus |
|
|||
Camera and Photo Help →
Beginner Questions →
spot metering D5600Started by Hebephrene, 21 Nov 2018 spot metering, auto focus |
|
|||
Camera and Photo Help →
Technical Troubleshooting →
Lens squeaks in live viewStarted by Therese, 11 Oct 2017 live view squeak, squeak and 2 more... |
|