The shadowing angle is based on the angle by which the light is hitting the subject. I agree with John. If you defuse the light, you will see softer shadows and less direct light strength. This will result in more even lighting with less shadow that is not as harsh.
Though many have had good results by shooting outside, you are at the mercy of both the weather and the location of the light source (the sun). On the other hand, being the master of your own environment is alot easier.
I would suggest that if you are serious about doing knife photography, you should build some form of lighting environment that will deal with the problems of lighting while you concentrate on composition.
Some years ago, I started out with a large cardboard box that I cut out so that I had the top and front open to cover with either a white garbage bag or you can use architectural velum which is available at most art stores. I then graduated to building a lighting wedge out of PVC pipe... As mentioned in a previous post, I purchased halogen utility lights to supply lighting which is defused. There are many ways to accomplish the same thing. You can also purchase a similar device or build something that suits you.
See me offline if you would like additional suggestions.
Regards,
Bob
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