90D + Tamron 150-600 g2

Started Oct 11, 2019 | Discussions thread
John Sheehy Forum Pro • Posts: 24,327
Re: 90D + Tamron 150-600 g2
1

thomste wrote:

or would have I encountered the same issue with the 100-400?

Same air?

Yes I am wondering if more expensive lenses handle 'bad air' better than cheaper ones or if all lenses are affected the same.
Just like some cameras handle low light better than others...

The air is part of the scene that any lens sees, just as much as your intended subject is. The worst situation is when the air between the lens and subject is better lit than the subject, even if you can't see that the air is lit with your eyes. A better lens does not fail to see some of what is really there. A better lens will show more of a loss relative to its potential, with bad atmosphere, even if the absolute result is only a small hair better because of the limits of the air.

You have made it clear that your lens can be sharp enough, in another environment, and your samples showed that nothing was very sharp at the shore, on the ground in front of and behind the subject, so it probably isn't front-focus or back-focus.

The only non-air possibility left is if the lens has a consistency problem due to temperature or something, like it had condensation on or in it at the shore (which could be from the air, too).

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