Questions tagged [focus]

Focus is the mechanism of converging light from a point light source onto an imaging plane by a lens.

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Why is my Nikon 18-300 lens not focusing at higher focal lengths?

I found a similar question about the 18-200. Someone suggested screwing the front element tighter. Is it possible to do the same with the 18-300? My problem happens at 200-300mm. I am not sure how to ...
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4answers
73 views

Focussing on a star with wide angle 14mm lens

Has anyone discovered a better way than trial and error to focus on a star - (for Milky Way Astrophotography)? I am using a Canon 5D Mk2 with a 14-40mm lens at 14mm. My Settings are ISO 12800 and ...
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1answer
136 views

Are internal focusing primes actually uncompensated varifocal lenses?

If I shorten the focal length of a lens without taking any other measures, that will reduce the required flange distance for infinity focus - meaning that if the actual flange distance is not changed, ...
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0answers
31 views

Focus highlighting thumbnails

Is there any software that will analyze the photos in a directory and create thumbnails with the areas most in focus highlighted in color? I know my camera (Sony a99ii) can do this real time. It ...
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0answers
53 views

auto focus in nikon d7000

I have a Nikon D7000. I am facing a problem. AF-S, AF-A, AF-C options are not showing in the camera monitor even after pushing the AF button and moving the dial. The different types of AF mode are not ...
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0answers
32 views

Focus ring does not turn in manual mode

I own the Nikkor "af-s 55-200mm f/4-5.6g ed dx" and recently in manual focus mode the ring is not turning and of course, I can not adjust the focus. So, what may be is blocking the ring? I ...
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1answer
140 views

Why is my Nikon D5500 unable to lock focus while using Live View but works fine when using the ViewFinder?

It just keeps trying to find focus. If I press the half-click focus button I hear the motor moving and the numbers on my lens go from smallest to infinity and stop. If I press the half-click focus ...
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1answer
567 views

Focus distance and infinity

When I play with M12 lenses (board lenses. Fixed fl. Aperture) , I can focus them to a distance and they have a certain depth of field. Objects within the Delta of field looks sharp. Can these lenses ...
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1answer
132 views

Sentimental photo taken by an iPhone out of focus

First let me say I am not a photographer, however I have a photo that was taken of my mom, myself and niece that is very dear to me. The photo was not properly focused I don't think. Could a ...