Focusing issue


m11ekd 1 1
28 May 2019 8:50AM
Wonder if anyone can poiont me in the right direction. recently I have noticed that my photos when zoomed in are out of focues. I have tried a vareity of lenses with the same result. either manual focus or auto focus the result is the same. How can I check the camera is focusing correctly or any other tests? any help would be welcomed

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franken Plus
17 5.0k 4 United Kingdom
28 May 2019 9:08AM
I would try zooming in whilst the camera is on a tripod. If the results are then sharp then it's possibly camera shake or the shutter speed is too low.
m11ekd 1 1
28 May 2019 9:34AM
all photos were hand held with VR on using single point focus for auto focus and zoomed in to manual focus auto focus was on single point and sigle AF
LenShepherd 11 4.0k United Kingdom
28 May 2019 12:58PM
Are you refocussing after zooming?

If yes - STOP!

Almost all zoom lenses are "varifocal".

This means if you get focus right at one zoom setting and then change the zoom setting - focus distance changes Sad

I appreciate it often easier to focus manually at the telephoto end of a zoom, but then changing the zoom amount without refocussing usually results in focus being slightly of correct.

brian1208 16 11.6k 12 United Kingdom
1 Jun 2019 7:15AM
"I have noticed that my photos when zoomed in are out of focues"

Can I check whether this means that they look in focus until you "zoom in" on the image on screen, ie: examine it enlarged to 100% or does the process of zooming in using the lens results in out of focus results?

If its the latter it may simply be that your lenses produces softer images a full zoom than it does when zoomed out and could just be a characteristic of the lenses (what lenses are you using by the way?). This softening at full zoom is a fairly typical behaviour for "consumer lenses"

If its the former, have you tried applying sharpening in post-processing and if so, does that improve things?
LenShepherd 11 4.0k United Kingdom
1 Jun 2019 10:14AM

Quote:Can I check whether this means that they look in focus until you "zoom in" on the image on screen, ie: examine it enlarged to 100% or does the process of zooming in using the lens results in out of focus results?

If its the latter it may simply be that your lenses produces softer images a full zoom than it does when zoomed out and could just be a characteristic of the lenses (what lenses are you using by the way?). This softening at full zoom is a fairly typical behaviour for "consumer lenses"


The OP has said out of focus, not soft.
Out of focus means focus is not where intended.
While some zooms have slightly lower resolution at maximum zoom, provided focus is done at the maximum zoom setting focus is where intended with reasonable photographic technique.
The only claim I have seen for a zoom not being vari-focus goes back to about 1980 with the Olympus OM long telephoto which from memory as it is decades since I owned was about 85-250.
The implication in the absence of manufacturers claim to the contrary is, to some extent, all zooms are unlikely to focus where intended if zoomed after focussing


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