Is there a REALLY effective way to get more Zoom from a Pany 100-300mm?

Started Jun 23, 2013 | Questions thread
Paul De Bra
Paul De Bra Forum Pro • Posts: 12,522
Atmospheric conditions are typically the limiting factor, not the lens.

I have the Olympus 75-300, not the Panasonic 100-300 but the same applies: Mild temperatures and overcast weather without a lot of wind is best, but of course you don't always have that option...

The turbulence in the air is what causes most of the image quality degradation. These lenses are equivalent to 600mm on a full frame camera. That's a serious telefocus lens. Go much longer and we would be talking telescope instead of camera lens. (Atmospheric conditions are also what limits the capabilities of telescopes that are not in outer space.)

My 75-300 is very sharp at 300mm, yet many images taken at 300mm have been disappointing, clearly because of heat-induced turbulence. It not only hampers sharpness but also makes it harder for the AF to nail the focus.

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