Isn't the airy disk the right PSF to use here?
About Bokeh
71–80 of 89 posts
Re: About Bokeh
#72As a very nearsighted person, I can see bokeh if I take off my glasses and look at points of light - either nearby small lights, or far-away large lights. Also, when I look at a bright sky through a tree's canopy, the canopy transforms into a breathtaking mosaic of bokeh, which becomes animated if the tree is swaying in the wind. Can people with normal vision experience this?
For me, points of light look like the canonical star shapes you see in telescope photos — which I don’t really understand because from what I’ve read, that effect is due to the braces which hold the telescope’s lens in place.
That's called a 'starburst' and it happens in human eyes for all sorts of reasons. It's possible naturally and also as a LASIK complication, for instance.
Look for 'starburst' here https://visionsimulations.com/ Sadly the simulation site is down because of the new Cross-Origin restrictions on images in canvases but perhaps you can see what it looks like in the preview images on the main page and if you google 'starburst vision'.
Re: About Bokeh
#73I am surprised about how biased this article is in assigning attributes like ‘good’, ‘bad’ or ‘perfect’ to Bokeh shapes. You can talk about this in these terms solely from an optical engineering pov. The shape of Bokeh is often why a lens get picked for a shot. What the author calls ‘bad Bokeh’ other people call ‘soap bubble Bokeh’ (google for it) and they are willing to cash out [2] for owning a lens that can produc…
To my personal taste, the bubbles in photos of your link 1 is very distracting.
Re: About Bokeh
#74One of my favorite Bokeh lenses is the Nikon 500mm reflex telephoto lens. The "Mak" style with a rear primary mirror and a front secondary works a lot like common compact telescopes. The Bokeh is tricky to apply, it's a fixed zoom telephoto lens so your subject must be at least 10 meters or so a way and it's hard to handhold, but the "donut" aperture of the lens makes for some very cool (or weird depending on your ta…
Almost anything can be used well for artistic effect. Here are some shots from the Nikkor 500mm: http://www.indeed.co.jp/blog/scrap2/lens/reflexnikkor_500mm_...
Oh, very nice! Since we're sharing bokeh photos, here's my favorite of the ones I've taken. It's the "creamy" style, not circular. Olympus E-P5 with Olympus 75mm F/1.8 (my favorite portrait lens):
Re: About Bokeh
#75I am surprised about how biased this article is in assigning attributes like ‘good’, ‘bad’ or ‘perfect’ to Bokeh shapes. You can talk about this in these terms solely from an optical engineering pov. The shape of Bokeh is often why a lens get picked for a shot. What the author calls ‘bad Bokeh’ other people call ‘soap bubble Bokeh’ (google for it) and they are willing to cash out [2] for owning a lens that can produc…
To my personal taste, the bubbles in photos of your link 1 is very distracting.
Yeah, and the swirls in Van Gogh's Starry Night are distracting too.
Re: About Bokeh
#76Earlier quoted context omitted.
These improvements to bokeh on the Pixel 4 and Pixel 4 XL show some pretty good results: https://ai.googleblog.com/2019/12/improvements-to-portrait-m...
Impossible to say because sample[1] is highly compressed and 800 pixels high (including a white border). [1] https://1.bp.blogspot.com/-3Sm2XHss0lA/XffZ95s_KjI/AAAAAAAAF...
Here’s the full size album: https://photos.app.goo.gl/cwaKemRDusTK5W6SA
Re: About Bokeh
#77I am surprised about how biased this article is in assigning attributes like ‘good’, ‘bad’ or ‘perfect’ to Bokeh shapes. You can talk about this in these terms solely from an optical engineering pov. The shape of Bokeh is often why a lens get picked for a shot. What the author calls ‘bad Bokeh’ other people call ‘soap bubble Bokeh’ (google for it) and they are willing to cash out [2] for owning a lens that can produc…
The "bad" pattern he calls out is not exactly the Trioplan soap-bubble style, it's the thing you get from a mirror telephoto lens.
In Trioplan images[1], the light intensity smoothly increases towards the edge of the disk of confusion, and creates a sharp edge. I agree that this looks kind of nice, although it's a quite specialized effect.
In mirror lens images[2], the "disk" of confusion is actually a ring, with two sharp edges rather than just one. This is not at all pretty, and as far as I know basically nobody buys these lenses for this effect.
This actually matters a lot, because other than this, mirrors are superior to refractive glass lenses in almost every way (note that astronomical telescopes are always mirror-based), so if it was not for the bad bokeh we'd all use them.
[1] https://fujilove.com/the-legend-and-the-bubble-bokeh-review-... [2] https://hoaiphai.wordpress.com/2011/10/18/recumbent-review-t...
Re: About Bokeh
#78Earlier quoted context omitted.
> And for most people it seems to work satisfactorily Most people apparently don't look at their pictures. The "enhanced" photos I've gotten from the Iphone for the last few models have just been getting worse. They look OK if you don't look too closely, but then they're just wrong . Blurry details on the same focal plane as crisp ones, crappy details with translucency, hair or anything else that confuses the "foregr…
Same experience here. My guess is most people view their photos on their phones, via Instagram or Facebook. Rarely are photos looked at in full size on a high quality monitor. I have no intention of giving up my Olympus mirrorless system. I'll probably add at least one more lens to my collection next year - I've been relying on my 12-40 f2.8 for portraits, but I'm liking what I've read about the Sigma 56 f1.4.
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Re: About Bokeh
#79if bokeh gets to this point, I don't know how is it going to look in the future. Is photography going to die
Re: About Bokeh
#80I am surprised about how biased this article is in assigning attributes like ‘good’, ‘bad’ or ‘perfect’ to Bokeh shapes. You can talk about this in these terms solely from an optical engineering pov. The shape of Bokeh is often why a lens get picked for a shot. What the author calls ‘bad Bokeh’ other people call ‘soap bubble Bokeh’ (google for it) and they are willing to cash out [2] for owning a lens that can produc…
One thing I notice is when people get into photography bokeh is one of the first things that they want to emulate (another was HDR).
But once they know the basic rules[1] of photography well enough to break them, they tend to view bokeh as that puppy-love attraction and now they are on to more serious photography. That is to say, bokeh is sometimes used as a crutch before people learn the basic rules and then learn how and when to break them to create a better photograph.
[1]https://www.flickr.com/groups/94761711@N00/discuss/721576221...