DPReview.com is closing April 10th - Find out more

Sharp, nice bokeh -- great lens!

Started Dec 27, 2019 | User reviews thread
medon78
OP medon78 Contributing Member • Posts: 697
Re: Sharp, nice bokeh -- great lens!

J A C S wrote:

medon78 wrote:

...

Some testers say, this lens would exhibit extreme vignetting. Well, looking at the example below (far from scientific, true!) I can see a 1.5EV difference in the corners between f/1.8 and f/5.6 in the RAW file. That does not bother me too much, since in-camera correction reduces this even further.

You are comparing different exposures and different ISOs... Optical Limits measured 3.8 EV vignetting, which is pretty extreme. I checked their numbers of other lenses (I do not own the RF 35) in RAW, and their numbers are quite close to mine. DPP measures extreme vignetting as well.

Yes you are right, the ISO were different in the real world snapshot.

I re-checked with fixed ISO against my white ceiling, with 4 variations -- lens corrections turned ON/OFF, focus set to infinity vs. focus at 0.5m.

Seems the both variables "focus" and "lens corrections" do not affect vignetting, maybe the focusing distance changes corner exposure by ~0.2 EV. Not too significant.

Result: Yes, vignetting is stronger compared to my initial 1.5EV statement; now it is close to 2.0EV.

I am sure the guys at Optical Limits have more sophisticated measurement methods and tools at hand, though. OR -- maybe the R and RP exhibit different vignetting thanks to different micro lens design. Don't have an EOS R at hand, though.

Cheers!

 medon78's gear list:medon78's gear list
Fujifilm FinePix X100 Canon PowerShot S110 Olympus E-M1 II Nikon Z6 II Olympus M.Zuiko Digital 45mm F1.8 +11 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow