Any other lens add-on’s like magnification and closeup filters can also cause problems.
REIKAN FOCAL FOR NIKON D750 MANUAL
Check your Extender’s instruction manual for lens compatibility. Sometimes auto focus AF may not be possible if you have an Extender attached to your lens.Times like these can make it hard for your lens to clearly know what it is you are trying to focus on. For example, if you are trying to focus on the horizon, or say an animal in a cage. Focusing on overlapping objects can also confuse your lens.I’ve been assured by other photographers that this is normal. Personally I find my lens sometimes has trouble auto focusing if I’m taking macro shots and the insect or flower is constantly moving.Photographing highly repetitive patterns like skyscraper windows or cars with reflective bodies can also cause problems.For example, a cloudless blue sky or a wall that contains one solid color. Many photographers find auto focus fails when photographing non contrasting subjects.Auto focus may have trouble working properly in low light conditions.If you are able to switch between AF and MF, you will find the switch for this on the side of your actual lens. This may seem obvious, however there have been many times when I’ve used manual focus and forgot to change it back to auto focus when required. The first thing to check when your camera’s auto focus fails, is that you have your DSLR lens set on AF (auto focus) and not MF (Manual Focus).Reasons why autofocus won’t always work on a digital SLR camera? Listed below are numerous reasons for your lens auto focus to fail. Over time, I noticed a pattern to this annoying problem. Instead, it would constantly move in and out, not stopping to focus on any particular object. When I first started using a digital SLR camera, one of the most frustrating problems I often came across, was when my DSLR lens wouldn’t focus properly.