[Brightcolours]

And your logic skills are simply... Well, to be expected from Brightcolours


Klaus talks about a 500mm lens and is saying on APS C it's 800 ( equivalence would be 1.62 times, but that's not the point)

Why would it be 1.62 times? You seem to be unaware that different sensors have different sizes. Not all Canon APS-C sensors are exactly the same size, not all FF sensors are exactly the same size, not all Nikon APS-C cameras have the same sensor size either.

and is saying he was doing longer tests than the 600mm Tamron in the past.

No, Klaus did not say that, you just want to read that. Klaus only said he has done longer focal length tests in the past. Not longer than 600mm tests, not longer than 500mm tests. You just made it into "longer than".

So, with an APS C sensor the crop factor is valid for Tamron 200-500, but not for Tamron 150-600? Now, who has a math problem?

What are you talking about? Klaus said he has done longer focal length tests in the past, and explains why those are problematic. The problematic part is why he will not test the new lens at 600mm, he does not have the space or conditions to formally test 600mm on FF let alone on APS-C, in his current situation.

To be correct, one needs to multiply 600 * 1.62 as well if the test camera is again an APS C. It is not correct comparing a 500mm lens with a 600mm and say, because it's a crop sensor behind the lens, now you have an 800mm lens, that's plain bullshit.

No one said that, it is just your reading comprehension skills which are a bit lacking. 

I don't know whether you realise it, but a 200mm lens on FF gets tested at a shorter distance than a 200mm lens on APS-C. This has to do with the testing methodology. So, yes, a 500mm lens on APS-C is tested at a similar distance as an 800mm lens on FF. Because the testing targets do not change.

500mm is not and never the same as 600mm, that's where all your and Klaus' equivalencing fools you.


But is it worth to make an argument about that really simple math? Problems with those focal lengths have much more to do with photog skills, tripod quality or quality of VR ( or whatever the marketing word of Tamron is for vibration reduction), atmospherical pollution or simply weather conditions. Or the question, if the normal factor of distance between target and lens should be 50 times the focal length


One hardly has always the weather conditions to shoot in 30m distance without any dust, mist or insects in between.