One huge benefit to a smaller sensor is the effective focal length multiplier.  Sure you can crop into an image captured at a wider angle, or on a larger sensor but as we have seen in the focal length vs sensor size post, when utilizing a smaller (relative to full frame) sensor, you can actually decrease your depth of field with the same focal length if shot from a fixed location, all while generically increasing your focal length by way of the effective multiplier in that smaller sensors crop into the larger image circle.  Aperture is aperture as far as exposure is concerned, so even by this standard, f/5.6 is relatively quick when you consider the focal length and price.  This said, is the Lumix G Vario 100-300mm f/4-5.6 (<UPDATE! click the link to see it at B&H, and if you click on “Savings Available” the price is down to $499 if you purchase one of the three things that qualify, like the $10.99 software…) worth the price of admission when you consider you get a 600mm lens able to shoot at f/5.6?  Let’s see…

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