Questions tagged [focus-adjust]

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7
votes
2answers
5k views

How do I diagnose the source of focus problem in a camera?

Probably a novice question, but how do I correctly diagnose from a photo for what reason that camera wasn't able to focus properly? It can be any 1 of the following Unsteady hand Lens issue Metering ...
54
votes
5answers
23k views

What methods can be used to micro-adjust autofocus of a camera body to a particular lens?

I have a Canon 7D with a 50mm f/1.4 lens, and I think the auto-focus of the lens is off. How can I test and adjust this reliably? Will this approach work with all of my lenses? If I had a different ...
7
votes
1answer
3k views

Which offers better results: FoCal or LensAlign Pro?

I am in need of microadjusting my autofocus for a couple of my lenses with my Canon 7D. Namely, I need to adjust the 100-400 L lens, which seems to consistently AF a bit softer than I've seen from ...
8
votes
2answers
6k views

If the focal plane is curved, should the outer AF points work correctly or front-focus?

Many (all?) lenses have a (slightly) curved focal plane. In general it's close enough to flat that you don't really notice it, but under certain conditions it may become apparent. As I understand it ...
2
votes
3answers
491 views

When a lens and camera are callibrated together, which is changed, and might other lenses be adversely affected?

I wonder what exactly is the calibration of a camera body and a particular lens. I know the effect, but how it is achieved? I recently bought 80-200 (the two-ring version), I was waiting for too long ...
7
votes
2answers
660 views

What is being set with Micro Focus Adjustment?

An autofocus system is system based on a feedback loop, where the AF sensor error reading if fed back to the lens focus motor. Being a closed loop, then theoretically there should be no focusing ...
1
vote
2answers
6k views

Can the 700D perform microfocus adjustment?

Can the 700D do microfocus adjustment as is needed for the Tamron SP AF70-200mm F/2.8 Di LD (IF) Macro? or is it only available on higher end models?
0
votes
2answers
1k views

Does this test chart show that my kit lens front focused?

I just bought me a Nikon D7100 with 18-140 kit lens. When I used focus test chart page 18 to test my camera and lens I got one of following result at 35mm/f4.2. I used Nikon's ViewNX2 to open the raw ...
7
votes
1answer
14k views

Can I fine tune the autofocus on my Canon 60D to be more accurate?

I noticed that some of my lenses auto-focus more accurately then others. (Assume perfect light conditions and fast shutter speed) Zooming-in on say the center focus point (if only the center focus ...
4
votes
3answers
1k views

Is it possible to DIY adjust the focus ring distance scale of a lens?

I have a particular lens in mind, but is it generally possible to do this adjustment? Of course there are a lot of lenses that don't have any distance scale to begin with. Many lenses have the scale ...
4
votes
1answer
568 views

Can I adjust the autofocusing of my Canon 6D Mk II myself?

So I took my 6D II into CPS for service. It was front focusing pretty hard and I couldn't get it micro adjusted. Canon sent an invoice stating exactly "focus points are off, unit is front focusing, ...
3
votes
1answer
352 views

How can AF adjustment be inconsistent across lenses?

How is it that sometimes a lens will work fine on a camera body without adjustment yet others need some AF micro adjustment tweaking. I would imagine that the accuracy of the AF system with regards to ...
2
votes
3answers
3k views

Can I fine tune the manual focus confirmation on my Nikon?

I haven't seen this answered anywhere, but does something or some software exist to fine tune manual (!!) focus confirmation (the dot at the bottom left) to more accurately represent focus? If I have ...