Corner tests for 16-35 f/4 vs. 16-35 f/2.8 (v.1) vs. 24-70 f/2.8L II

Started Jul 4, 2014 | Discussions thread
Jay A Senior Member • Posts: 1,694
Re: Corner tests for 16-35 f2.8 MkII

Just another Canon shooter wrote:

Jay A wrote:

Just another Canon shooter wrote:

Jay A wrote:

If a corner from one lens looks better than the same corner from another lens...ALL ELSE BEING EQUAL, then the one with the better corner handles corners better, no?

No. It means it does it better in this case. It does not tell you what happens if you use each lens in an optimal way. Also, it does not tell you how big the difference is when you do it properly.

For example, the 24-105 handles corners better at 24mm than the old 24-70 when focused at infinity (because, according to PZ, the 24-70 is horrible at the corners at 24mm while the 24-105 that I own is just bad) but I can never get the good corners of the 24-70 when focused at 2m with my 24-105, no matter how deep I focus (but I can optimize the sharpness by choosing the right focal plane).

Well then based on what you are saying, there hasn't ever been a test done that is valid because none have ever covered ALL SCENARIOS that a particular lens may be used under. For that matter, all the test target tests such as those done by the-digital-picture are useless because they test at the same distance all the time regardless of whether or not the particular lens being tested is any good at that distance.

All tests done in UWAs lenses in PZ (at about 48cm, FL=16mm) are basically, useless, you are right if this is what you want to say. I wish those two lenses here really performed as what you see there, in the corners. Unfortunately, they do not. If you believe that TDP reflects real life scenarios, then you can hardly tell the new 16-35 apart from the 17-40 at f/11 (and they do not test the extreme corners anyway).

You are missing the point of my remark because you are too lazy to read the thread. I am NOT talking about shooting a chart and moving to a different point - I am talking about choosing the focal plane. Kinda hyperfocal, 1/3 into the scene, etc.

I KNOW you are not talking about shooting a chart. I was the one who brought up the chart analogy to show you how ANY test would be useless using your criteria. Do you not understand this or are you just satisfied with calling me lazy and being done with it? I am suggesting that any test be taken with a grain of salt and taken for what it is. I frankly think that way too many people put WAAAAY too much emphasis on internet lens tests. However, I still feel that the test shots done here are of some value as all other variables are consistent (with the one exception of the third lens having been thrown into the mix).

The difference between you and me is that I am likely to say ok, interesting results and I learned something from them but also need to test the lenses myself...when you seem likely to say this test is totally flawed so everyone should ignore it.

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