His statement, taken literally, is true.
I read the blog and agree with much of what he says. Anyone who believes that dropping $3K to $8K on camera gear will actually improve their photography does not have their head on straight. Photography is not about the gear but about seeing and understanding the relationship between shutter speed, aperture and the film or sensor and of course.. the light.
The top of the line gear might actually improve the image quality but not the photography.. one is a subset of the other.
A $40 book on photography can actually do more to improve your photography than buying a $7,000 Leica... as long as you comprehend what you are seeing and reading in that book.
The use of a fully manual camera, over a period of time, will also improve your photography as you begin to understand the relationship of all the variables: shutter speed, aperture, ISO and the light. Those who shoot in auto mode all the time are missing some important lessons as the camera is doing the "thinking" for them.
Improving your photographer's eye is something that you can't depend on any camera to do for you, digital or otherwise. That comes with practice and examination of what great photographers have done in the way of composition and the light that was available to them at the time of capture.
The beauty of digital is that the learning process can be accelerated. I learned more in the first year of using my D30 than I ever did shooting my Canon A-1. You can get instant feedback from a digital camera and see what your chosen settings produce image-wise while still "in the moment" so to speak. You can experiment, constantly, and hopefully learn from that experimentation. This can be done with almost any digital camera that offers a manual mode in which you control the shutter and aperture. It doesn't matter if the camera is a point and shot, a DSLR or a rangefinder.
The only thing that makes you a better photographer is practice and time. No one is born with the skills of a great photographer but those skills can be developed over time with just about any camera.
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Jim Radcliffe
http://www.boxedlight.com
http://www.oceona.com
The ability to 'see' the shot is more important than the gear used to capture it.