« on: Today at 12:56:59 PM »
Total simpleton here that has tried gamely to follow the logic of this thread. I accept the circa 20% difference but can someone put this in laymans terms for me....I currently have a 5DIII with 300mm and 2x converter. However, with a 7D2 I could achieve slightly greater 'reach' with a 1.4x - in this instance would a 7D2 with 300mm and 1.4x be a better option than a 5dIII with 300mm and 2x converter? I am reach limited more often than not and I guess the other benefits of the 7D setup include higher FPS, lighter weight and faster aperture.
I've done the comparison 70D + 300mm f/2.8 II+ 1.4xTC III f/4 vs 5DIII + 300mm f/2.8 II + 2xTC III f/5.6.
There is little to choose between them, if anything the 70D was sharper. The extra stop compensates for the extra noise on the 70D - I used iso 640 for the 70D and 1250 on the 5DIII, and the 300mmx1.4 TC combination has a slight inherent IQ edge over the 300x2TC. So, I think the 7DII with the f/2.8 II+ 1.4xTC III or the new 400mm f/4 DO would be a very nice set up.
Thanks for getting me to look at my old images (I had deleted them from Dropbox and had to recover them). It's made me change my mind about getting a 7DII as for the particular case of the 300mm f/2.8 the crop looks as if it will outperform the 5DIII.