Originally posted by AI8877 ...Everyone said it would be a razor sharp lens but the way I see it is not much of a difference between this and the Kit 28-105...
The "kit" 28-105 is a very good lens.
Anyway, to test your new 70-200 for sharpness, or any other lens, I recommend:
- Tripod. That will eliminate shake from handholding. Yes, shake reduction in the K-1 should fix that, but you're testing your lens and try to eliminate other variables. (Alternate: rest the camera on a table)
- 2 second timer. That turns off shake reduction while allowing time for vibrations to settle from pressing the shutter button. (Alternate: use a remote)
- Turn on live view. That eliminates any mirror slap from the camera.
- Manual focus, or autofocus within live view. You want to rule out any autofocus issues with PDAF, the type of focus that operates when using the optical viewfinder. PDAF can be fine-adjusted in the camera menus later, if needed.
- Pick a flat non-moving target with detail. A brick wall can work. A paper with fine print attached to a wall. A hung tapestry.
- Compare test photos at f2.8, 4,5.6, and 8. f2.8 with the 70-200 should be sharp but thin depth of field. Sharpness and depth of field should increase as you stop down.