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Sharp, nice bokeh -- great lens!

Started Dec 27, 2019 | User reviews thread
J A C S
J A C S Forum Pro • Posts: 20,521
Re: Sharp, nice bokeh -- great lens!

medon78 wrote:

J A C S wrote:

Here is a curve derived from one of you RAW files:

It goes to -2.1 or -2.2 in the extreme corners.

OK! Thank you very much. So... no -3EV or more as the Optical Limits guys sampled. Then there must be either something wrong with my uncalibrated ceiling ;)... hmmm.

I do not think that you can make the vignetting weaker by doing a bad test, this is very hard. On the other hand, a poor test can easily make it look stronger, if the light is more directional than one would think. Taking a shot of a wall pained with a glossy paint is an example. This is especially tricky with wide lenses.

If you would like to compare other lenses, I would have the EF 85/1.8 and EF 50/1.4 at hand.

Since I have the spreadsheet ready, yes, please. You can try to unscrew the lens a bit so that the camera does not cheat. You need to tell the camera to take shots without a lens first (it is somewhere in the menu).

You can see my thread in the PST forum as well, where I tried to catch my R cheating. 

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