Sigma 150mm - 500mm apo

joecrow

I am a newby to photography and I have a D3100. I wanted to get some better shots of birds so I invested in the Sigma 150mm - 500mm apo lens, however I am having a problem with the auto focus not settling on the subjects and focusing in and out. What am I doing wrong? ;-(

robbo

If I have problems focusing on birds, I switch to manual focus. Place the current focus point over the subject and turn the focus ring until you see a dot to the left of the info area at the bottom of the viewfinder. That shows the lens has got focus.

joecrow

Superb! Thank you, I'll try that.

Landon

Thanks Robbo, I never knew that.

Another way is to use the LCD screen in LV mode. Zoom in with the plus button and then manually focus it. This is how I focus on stars and the moon.