Joe, thanks for checking this out and commenting. I'm not sure how jackhammers and concrete figure into photography, but it's early and I'll have to give that some thought. I would think it more likely a comparison between the camera lucida and something more modern might be more appropriate.
joer wrote:
Having the latest and greatest equipment in any endeavor puts the onus on you and eliminates any excuses for mediocre performance. Assuming you chose correctly for the task at hand.
You can break up a slab of concrete with a claw hammer if persistent, but a jack hammer will do it better every time.