Rodney Campbell's Blog

Sigma 50-500mm OS Focus Test…

by on May.13, 2012, under Life, Photography

I figured that whilst I still had Gerry’s focus test tool (thanks Gerry and yes I know I keep forgetting to bring it with me to return it…) I’d see how the focus works on the new lens.

The Nikon D7000 has AF micro adjust capability which allows you set specific adjustments for different lenses – however as it turns out it looks like I won’t be needing it for this lens.

I locked the camera down on a tripod with a remote cable release in a well lit area a couple of metres from the target and shot wide open (with OS off) at various focal lengths (manually setting the focus way out for each before half pressing the shutter to AF and then taking an image). Focal lengths I tried were at 50, 70, 100, 135, 200, 300, 400 and 500. Even at 100% zoom on the computer it’s a little hard to tell at this distance at the shorter focal lengths but by 200mm it is easy to see where the depth of field lies in the image on the measured target and focus looks to be pretty bang on through 200, 300, 400 and 500mm (at this distance) – gotta be happy with that.

A close up view of the target for 290mm

NIKON D7000 + 50.0-500.0 mm f/4.5-6.3 @ 290 mm, 1/160 sec at f/6.3, ISO 100

Coming soon some first “real” images in the field…

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