Kjeld Olesen

Despite all the progress made to smartphone photography, there are so many applications of real cameras that they can never replace.
It is more likely that smartphone will become obsolete before...

See https://www.gunpowdervideo.com/2020/05/13/review-venus-optics-laowa-9mm-leica-m/

Now make the 5.5 mm rectilinear for EF-M and I will buy :-)

It is a great composite indeed, but I agree that since the rules said "No cutting and pasting" it should not have been entered in this particular challenge :-(
I might have forgiven the violation,...

But then see some of these ones ! 400 mm f/1.5  - seriously?!?! https://www.cyberphoto.se/captains-log/varldens-ljusstarkaste-objektiv

But Steve was exactly comparing equivalence, so your response was odd. I think there is mounting evidence that you DO suffer from " equivalence denial " What Steve said "On the other hand it's no ...

But the original remark was related to equivalence - if using the same F stop and ISO on different formats, you will not get equivalent resulting images. Same FOV and same F stop will give ...

Surely you must mean at the same f-stop, as at the same aperture and same FOV you would not get the same shutter/ISO.

You are right, f/5.6 is always two stops faster then f/11 on any format, but the issue is not about f-stops, but aperture diameters. And from actual aperture diameters and equivalent focal lengths ...

Yes, it is not only that you will loose infinity focus, but rather that you will not be able to focus past perhaps 10 meters - not sure with the particular lens

DO lenses according to canonrumours so they may be quite small, i.e. not much larger than a 300/5.6 and 400/5.6 respectively, but presumably sharper than those combined with a 2x TC.

Apply a little software cropping and pretend you are using a MFT camera ;-)

Unless you actually need the megapixels, why not just opt for software cropping? With a 2x crop in both dimensions the EOS R results in a 7.5 MP image, and also gives you some flexibility as to ...

All in all it sounds like a broken cable to the IS - have you tried the zooming procedure with IS turned off?

Perhaps a closeup image of the two, including an image of the TC release know will help us help you :-)

It assume you are jesting? Considering the diameter of the front lens element, there is not just a singular point viewing the beak, but rather a circle, so the twine will of cause not obstruct the ...

Because the twine is blurred black, so it adds nothing on top of the sharp beak. Had the twine been white, I think it would have appeared clearly in front of the beak.

Yes, well, it is not actually Saturn, but it kind of looked like Saturn :-)

Re Nnfim "All alcohols are safe to use"
Do NOT use methanol - while it may not damage the lens, it could still end your photography endeavors!