What would interrupt my digital camera from focusing or what could I point my camera at that would make it not able to focus.
Best answer:
Answer by Tony
Either an object that is too close to the lens, (this may need to be very close if it is a small camera).
An area with little contrast or an area that is largely the same color.
Or a dark area, those are the main 3 things that would cause difficulty focusing.
Give your answer to this question below!
Shooting in the dark would prevent your camera from focusing. It's actually the lack of contrast or detail that prevents AF from performing its job.
ReplyDeleteDepends on the camera.
ReplyDeleteCompact cameras typically use contrast-detection for their autofocusing while DSLRs use phase-detection. Between the two, phase-detection is more accurate.
I have found that the contrast-detection version lacking. Take a compact camera and try to focus on clouds in the sky. It is best if they are Cumulus clouds - those nice fluffy clouds that sometimes provide interesting and drastic views.
I once saw some very nice Cumulus cloud patterns but my compact camera would not focus on them, as the contrast-detection was lacking. Of course, this might have been due to the camera being several years old, so the newer cameras may not have this issue. But contrast-detection, by definition, needs a scene with contrast in it (lights and darks), and clouds don't have a lot of contrast.
If this is a homework question, then disregard the above as it is not true.
Autofocus does not work well in the dark. Autofocus cannot work if there is no contrast within a subject, say a clear blue sky, an evenly cloudy sky, a blank white wall. If you move the camera fast to follow action the autofocus may not react fast enough. If the subject is too close the lens will not be able to focus it (so use a macro lens).
ReplyDeleteAll those reasons vary somewhat from model to model and brand to brand, and, if a DSLR, from lens to lens. Generally focussing is more responsive if you spend more on the camera body.