You can compare it for very long, but overall, if we don’t touch the very high end, I think that systems are competitive. Why Olympus 75-300mm F/4.8-6.7 II?

Olympus OM-D E-M1X + M.Zuiko 75-300 mm f/4.8-6.7 @ 300 mm, efov 600 mm, f/6.7, -0.3 step, 1/3200, ISO-4000, Pro Capture H In reality, the difference wrt brightness is less than the f-stop difference would have you think. The 100-300 has more vignetting and poorer transmission so it only gives you about 1/3 stop more in the center and nothing toward the edges/corners when shooting at the long end. Is it the lens you should take on the safari trip of a lifetime? No, you're still going to want to look to the f/2.8 Pro trinity glass for the serious stuff. However, if you're after the perfect lens to take to the zoo or to cut your teeth in sports photography, this is the one to go for. Diffraction limiting sets in at ƒ/11, though the results at the shorter focal lengths aren't immediately obvious until ƒ/16 or ƒ/22, where we note very soft results across the frame (especially at 300mm).I can say that there is significant sample variation of the Olympus mkI - the first one I had was poor at 300mm - not sharp at all beyond about 250mm - and I just assumed that was how the lens was. However when I acquired a second copy it was so much better - really biting sharp at 300mm wide open.

Olympus 75-300mm F/4.8-6.7 II has a lot of limitations, but it does create good value, considering its price. It especially useful when you need a compact super-telephoto. It could be a good tool for someone who doesn’t need 300mm often and therefore doesn’t want to buy an expensive specialized lens. So without further ado (as they say on YouTube), here's our list of the best Olympus / OM System lenses to get right now. Best Olympus ultra-wide-angle zoomsI have to do a side-by-side comparison of the two lenses shooting off the tripod with the OIS turned off, but the limited hand-held tests I've done so far seem to indicate that their optical quality is roughly on par with each other. However, the Olympus lens seems to deliver much more consistent quality resulting in a much higher keeper rate than the Panasonic.