These are test shots from my recently purchased Sigma 50-500mm f/4.6 – f6.3 Sony Alpha mount lens. These were taken with my NEX-7 with an LA-EA2 adapter. The LA-EA2 adapter converts Sony E-mount to Sony Alpha-mount and provides translucent mirror technology for faster and more accurate focusing.
The focusing does indeed work well and fast. There are times when my 18-200 E-mount lens doesn’t want to focus, particuarly on distant low-contrast objects. I didn’t have this problem at all with the Sigma Lens using the LA-EA2 adapter.
The focal length on each of these shots was 500mm, or an equivalent of 750mm on a 32mm camera. Aperture on all shots was set to f/6.3, which is the widest aperture possible at that focal length. All shots were hand-held with the optical stablizer turned on to position 1. Sigma claims that OS provides up to four stops of stabilization.
I used UFRAW to process the RAW files from the camera and then used GIMP to do a minor amount of post-processing. This consisted of adjusting contrast somewhat and then sharpening it using unsharp mask.
UPS Airplane. 1/500 sec, ISO 200, 100% crop:
Delta Airplane. 1/500 sec, ISO 200, 100% crop:
“Big Tom”. 1/80 sec, ISO 1600, cropped and scaled.
Moon. 1/500 sec, ISO 200, cropped and scaled only slightly.
