Sigma 17-70mm F2.8-4 DC Macro OS HSM C Review
Mac users, we're pleased to announce Macphun's all-in-one photo editor Luminar is now available for just $69£52. We rated Luminar as "Highly Recommended".
The Luminar Creative Bundle includes a mega preset pack, overlays, an eBook and more all for free. Plus, Luminar also now offers free and premium preset packs. Use coupon code "PHOTOBLOG" to save another $10 on Luminar.
Visit the Luminar web site to try it for free.
Sharpness at 70mm
For this test, the Sigma 17-70mm F2.8-4 DC Macro OS HSM lens was attached to a Canon EOS 70D body, which in turn was mounted on a sturdy tripod. Exposure delay mode was activated. Tonal and colour variances across the crops are due to changes in natural light during the session.
The full frame at 70mm
Centre sharpness is high through from f/5.6 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the centre, with f/8-11 producing the sharpest results.
|Aperture||Centre Crop||Edge Crop|