Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
Nephi Contributing Member • Posts: 531
Re: Heat waves

osv wrote:

these are both 600mm f/6.3 shots from my tamron 150-600, with fast shutter speeds, same scene that i posted earlier, shot across a busy freeway... the "hospital san diego" text is reasonably sharp? you can still almost read the license plate numbers, but this looks like a possible heat wave problem to me... it's ooc jpeg, a nightmare compression scenario.

the alignment on the brick wall shot looks fairly close, because the bottom corners look equivalent to each other; the outer center/top corner region on the left side looks weaker, however.

the first thing you are looking for with any test shot is that the sides match each other, followed by how do the sides compare to the center.

Dan,

As others have noted the brick wall test is very hard to do correctly.  Even the slightest lack of a being  parallel and you will get skewed results.  Not to mention a slight difference in the way the light hits the wall can cause sharpness differences.  Personally, I would only use the brick wall test to check for gross decentering

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