JoJu ... it is simple. I just don't understand why you can't get it honestly.
I tested the Tamron 200-500 long ago ... probably 6ish years ago. If you read the review you will notice that it was done on a 8 megapixel EOS 350D. Based on this (APS-C) camera the shooting distance was 30m(!). I finalized the test but thereafter I decided that this isn't practical anymore for the various reasons that I outlined before.
One very simple point is that the results aren't even comparable WITHIN the same system anymore - simply because of air diffusion. A 20mm is obviously far less affected than a 500mm lens.
Now as a solution we could obviously ask NASA whether we could rent their vacuum chamber used for Space Shuttle testing over in Florida maybe ...
I could have repeated the exercise on full format (at a lesser distance) - ignoring the mentioned limitations this is technically possible, of course.
Given the interest we decided that Markus will give it a try. However, we'll add a word of caution to the review.
Generally 400mm will remain the finishing line. Beyond I have issues regarding the quality control of the tests. Risking consistency is risking reputation and that's our most valuable asset.
I tested the Tamron 200-500 long ago ... probably 6ish years ago. If you read the review you will notice that it was done on a 8 megapixel EOS 350D. Based on this (APS-C) camera the shooting distance was 30m(!). I finalized the test but thereafter I decided that this isn't practical anymore for the various reasons that I outlined before.
One very simple point is that the results aren't even comparable WITHIN the same system anymore - simply because of air diffusion. A 20mm is obviously far less affected than a 500mm lens.
Now as a solution we could obviously ask NASA whether we could rent their vacuum chamber used for Space Shuttle testing over in Florida maybe ...
I could have repeated the exercise on full format (at a lesser distance) - ignoring the mentioned limitations this is technically possible, of course.
Given the interest we decided that Markus will give it a try. However, we'll add a word of caution to the review.
Generally 400mm will remain the finishing line. Beyond I have issues regarding the quality control of the tests. Risking consistency is risking reputation and that's our most valuable asset.