Pit123 said:In that case I need to copy your exact distance, camera, camerasettings and PP settings as well.AlanF said:You could do a comparison. Print off the iso chart (you can find it on the internet) on A4 or US paper, and photograph it at a distance to give the same size image as I posted. Then photograph it with your 100-400 at the same distance and upsample it at 1.5x and compare.
I was only joking about your 300 being a bad copy - the lens is phenomenal.
Also shooting at 2500 iso is meaningless if you are looking for details at 100% crops.
And printouts for test purpose? I dont find that to be suitable for high res comparisons.
Anyway, here is a 100% crop from my 100-400mm. raw file opened in fastone (no sharpening):
OK, use your set up and conditions and post a 100% crop from your 600mm combo and an upsampled one from your 100-400.
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