bclaff

To produce a larger image circle you need larger diameter elements which will needlessly increase the cost to produce the lens (and it's weight). So there is no practical reason to design for a ...

Just to be clear. The image circle we observe may be larger than the image circle that has "reasonable" quality. The edge of the designed image circle is not abrupt. Certainly, wide zooms tend to ...

The Javascript got messed up and I reverted to an earlier version. Should be OK for now. Although I'm about to retest the new version so it may break briefly . :-( Looks like we're OK. Compiler hiccup?

Yeah, the Optical Bench patent for the Olympus M.Zuiko 14-42mm F3.5-5.6 II R shows an image circle diameter of 20.14mm at the wide end and 22.30mm otherwise. (This is I with a D subscript on the ...

No problem. FWIW the design image circle of a TS lens is considerably larger.

Thanks for the resource. Not so good a fit as I like to see but I added it to the Optical Bench and Hub:

Yeah, I alluded to this earlier. Wide zoom lenses often have a smaller than expected image circle at the wide end. Here's an example from a patent Olympus M.Zuiko 14-42mm F3.5-5.6 II R : Best ...

And for Fujifilm GF see Fujifilm MCEX-18G and MCEX-45G on GF Lenses

You misunderstand. I don't reject it; I simply say it's sub-optimal.

Do you have a reference for the lens construction diagram?

Well, I do hope you take a closer look. I'd rather you agree rather than simply deferring.

But since the diameter is important it matters which plane you choose.

There is no question that there is light projected beyond the designed image circle. There's also no doubt (in my mind) that the quality of that light isn't so good. FWIW, below is the Nikon AF-S ...

Although people do it I don't believe you can properly treat DoF in object space because it's what happens at the image plane that matters.

Not briefly although I have an article pending on this. FWIW, DoF depends on the exit pupil not the entrance pupil as is most commonly stated. The reason this is "OK" is that when you assume pupil ...

I strongly disagree. Many of the patents I have examined (I have examined about 2000 optical prescriptions and about 120-150 "match" production lenses) correspond closely to existing production ...

You may be observing light beyond the designed image circle. Often the circle is restricted in the design because of severe aberrations at the extreme.

You might want to try the Optics Primer button for a start.

Yes. And even though it's "Open Talk" I'll add some technical information. Depth of Field (DoF) is affected by pupil magnification which is the ratio of the size of the exit pupil to the entrance ...

So, here is the Nikon PC Nikkor 19mm f/4E ED as seen in the PhotonsToPhotos Optical Bench.: Note that the image circle (Image Diameter), highlighted, is 66mm. (And that the full Angle of View at ...