But before we get too carried away, let's start by defining our terms. What exactly is the difference between a close-up and a macro photograph? It's all to do with the reproduction ratio, which is a way of describing the relationship between the actual size of the subject and the size that it appears on film.
If the film image is the same size as the subject, then the reproduction ratio is said to be 1:1, or life-size. If the image is twice the size, it's a 2:1 ratio. And if the image is half the size, it's a 1:2 ratio. Another way of expressing the reproduction ratio is in terms of magnification. If something is magnified four times, it will appear four times bigger on film than in real life - ie a 4:1 ratio - and is often written 4X.
Close-Up Photography is where the reproduction ratio is from 1:10 to 1:1 - ie from 1/10th life-size to life-size.
Macro Photography is where the reproduction ratio is from 1:1 to 10:1 - ie from life-size to ten times life-size.
And, for the record, Micro Photography is where the reproduction ratio is greater that 10:1 - ie greater that 10x life-size.
In practise the distinction is academic. It's the picture alone which is really important.