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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!
1

MayaTlab0 wrote:

J A C S wrote:

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.

Are there methodologies that can eliminate focusing distance

One usually tests with focusing distance infinity.

or colour profiles as a variable when expressing vignetting in EV ?

I measure RAW files. Most websites however (except DXO, I guess) measure JPEGs, and the tone curve would affect what they report.

Differences between various websites' results in EV may just come from that, no ?

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