Looks like I am getting addicted to conducting homebrew simple test. Read about the sharpness evaluation of my Tamron.
After trying out a rented Sigma 10-20mm f/4-5.6 EX DC HSM ultra-wide angle lens earlier, I grew to love the distortions from it at the widest angle. I was certain that I need to get myself a piece of that lens. So I managed to trade with a CSer for this piece of lens.
SPECIFICATIONS AT A GLANCE
- Lens Construction 14 Elements in 10 Groups
- Angle of View 102.4 - 63.8 degrees
- Number of Diaphragm Blades 6
- Minimum Aperture F22
- Minimum Focusing Distance 24cm/9.4 in.
- Maximum Magnification 1:6.7
- Filter Size Diameter 77mm
- Dimensions Diameter 83.5mm X Length 81mm3.3 in. X 3.2 in.
- Weight 465g/16.4 oz
I decided that I should perform a simple functionality check, identify potential front-back-focusing errors and determine the best aperture to give overall sharpness.
Identification of Best Aperture for Details
click on thumbnails to enlarge pictures
100% crops of images shot at 10mm with apertures f/8, 11, 13 and 22.
Left - Left of image, Center - Center of image, Right - Right of image
Sharpness are ranked from 1 (sharpest) and the highest (poor).
f/13 is the best aperture for capturing most details at 10mm and the worst being the most narrow aperture.