Hmmm..so for those photos that I see with only the insect head greatly magnified, does that mean that they used a lens that give a higher magnification factor?Originally posted by azone

Yes, higher focal length will result in higher magnification. The formula goes like this:

magnification factor = f / ( 1000 / d )

At 10x zoom, the focal length of C750 is 380mm, so with a +4,

magnification factor = 380 / (1000 / 4) = 1.52

So if I were to get a +10 filter, it will be overkill? since the factor is 3.8?

So this means with a +4, the max magnification can only be acheived if I zoom all the way? In other words, if I zoom halfway at 190mm, my magnification factor will be 0.76? Does 0.76 mean that it will make it look smaller?Nope, you can certainly zoom halfway, 3/4 way, etc. It just depends on how much magnification you want or how you want to compose your picture. The formula is just an indication of the maximum magnification you can achieve with your camera.

Getting confused...

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