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Autofocus is the ability of a camera/lens system to automatically adjust the focus of the lens via a motor attached to the focus group of the lens. Contrast with manual focus.
749 questions
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Tamron SP AF 70-300 F/4-5.6 Di VC USD - autofocus fail?
I'm trying to diagnose an issue with my Tamron SP AF 70-300 F/4-5.6 Di VC USD Lens (used with canon 90d).
When trying to focus on something, the lens sometimes takes ages to find the focus. This is in ...
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answer
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Help with Tokina ATX PRO 11-20mm f2.8 DX
I just bought my first ultrawide (and first 3rd party lens) for my Nikon D7100.
The issue I have is regarding AF/MF switching. What I do is pull the ring back to enter manual focus but then it becomes ...
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How does mirrorless camera autofocus work with very "slow" lenses?
On DSLRs, phase detection autofocus requires a somewhat "fast" lens (f/5.6, sometimes f/8), and getting a very accurate focus requires a "wider" AF sensor that only works with fast ...
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Sony FE 90 mm F2.8 Macro - strange autofocus behavior
I recently bought a used FE 90 mm F2.8 Macro lens for my Sony A7iii.
Sometimes, when I go to engage auto-focus with the "AF-ON" back-button, the lens will go way out of focus before coming ...
- 113
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2
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How to improve autofocus perfomance when focussing at birds flying at large distances in bright sky?
While photographing terns at a beach with my Nikon D7200 and Sigma 150-600, autofocus frequently fails, resulting in blurry images or focusing on the bright sky instead. This setup works fine for ...
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2
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213
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Tamron SP 150-600mm Di VC USD G2 - what could cause strange seeking/searching behavior?
I bought a used, like new Tamron SP 150-600 Di VC USD G2 from a reliable source.
I read that it is compatible with the Nikon D5600 APS-C camera. When trying it out, the lens has some strange seeking/...
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Nikon D3400 always refocusing or out of focus
Can cameras get old and stop working?
I've had my Nikon D3400 for about seven years, one major drop once that only killed the safety piece over the lens.
When taking videos, the camera often refocuses ...
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Auto-focus on sensor shift technology
I just wonder how the auto-focus working in sensor shift, I meant the sensor shift stuff was like stabilize the sensor as well as its move the lens too (like in iphone 12 upward), I just dont know how ...
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What is the maximum velocity possible for autofocus (focusing speed) on a Canon 5D Mark II
This question is very specifically worded, because I lack the knowledge to formulate it in general and also proper terms. I am an amateur, so don't hesitate to improve this question with better ...
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Why did my Olympus AZ-330 Superzoom not focus and wash out my pictures?
I am new to film photography and I took these pictures in bright lighting, without flash (I read about it, now I know I should have used flash). I used Kodak Gold 200 in these pictures, and my photos ...
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What Nikon bodies support SnapBridge and recent F-mount lenses?
I have a Nikon D3000 and several auto focus capable lenses. I am looking to upgrade my camera to another Nikon but something newer that has Snapbridge and will work with my auto focus lenses. Anyone ...
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2
answers
185
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Issue with focus when using the viewfinder
I've got a Sony A6500 with a Sigma lens (30mm 1.4 DC-DN).
When I take a picture of a landscape (all green squares appear when focusing) it works nicely. However, if I take the same picture (with again ...
- 21
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Canon EOS90D Auto-focus indicator light
I have a Canon EOS90D and would like the auto-focus indicator light to come on in all light conditions. Can anyone help with the required settings?
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How do I get an interchangeable lens camera on a tripod to focus on my face while I'm taking selfies?
I want to place the camera on a tripod, frame the shot, set the timer, stand where I want to be photographed, have the camera detect my face (sharp focus) and take the picture.
My DSLR can't do this. ...
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Canon EOS 7DII - focus settings for birds in flight
I recently acquired a vintage Canon EOS 7D Mark II with a low shutter count. Initially, I had very good results for birds in flight, but later I started experimenting with the very sophisticated ...
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