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Questions tagged [diffraction]

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Airy disks and pixel pitch on circle of confusions?

I read in this paper by Toshiba, which is in regards to optics in machine vision, that In machine vision, which processes each pixel of an image sensor at high brightness levels, the permissible ...
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vannira
  • 343
0 votes
2 answers
131 views

Why does the rainbow change into a green light when zooming using iphone

The rainbow is created with Kikkerland rainbow maker. When zooming with an iPhone the image abruptly changes at 2x zoom to a green light. What is the physics behind this?
Albert's user avatar
Albert
  • 1
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2 answers
150 views

how to find best FX camera to avoid diffraction at small apertures

Long time Nikon user. Looking to capture highest resolution images at smallest apertures possible in order to obtain most depth of field. Have read various scientific writing about diffraction and ...
Martha Smudger's user avatar
Martha Smudger
  • 29
3 votes
1 answer
379 views

Is this just chromatic aberration? Or is something else happening in these photos?

I took these photos with an old Nikon D60, using a 55-200mm f4-5.6 Nikkor lens, with no filters. ISO was set to 200 and aperture was set as open as possible - which suggests to me this might just be ...
Dan's user avatar
Dan
  • 33
2 votes
2 answers
341 views

Sweet Spot on Zoom Lenses on APS-C CMOS sensors?

I have made the conscious decision not to go full-frame on my camera body purchase but to spend the money on top quality 'L' lenses for my Canon 80D. More explicitly, I have the 24-105mm f/4 L and 70-...
George Tod's user avatar
George Tod
  • 21
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1 answer
64 views

Why does the electronic shutter prone to diffraction?

According to some comparisons I've read between mechanical and electronic shutters, the latter is prone to the diffraction of light, how so?
stky12's user avatar
stky12
  • 3
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1 answer
200 views

How can we calculate effective megapixel loss due to diffraction?

How can we calculate an image's effective megapixel count at each aperture setting, specifically as loss relates to diffraction? Assume that we already know the sensor size, its true megapixel count, ...
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icor103
  • 739
7 votes
2 answers
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What is the difference between Diffraction Spikes and Lens Flare?

When Googling for lens flare, one often finds images that also include stars (rays / diffraction spikes), like this: What is the difference between diffraction spikes and lens flare and are the two ...
OnBreak.'s user avatar
OnBreak.
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1 vote
3 answers
515 views

Is it better to shoot at diffraction limited aperture or sharpest lens aperture?

In the old cameras like Nikon D80 with 10 Megapixel pixel count. The diffraction limited aperture is F/13 but its known that lenses are generally sharpest at the F/8 so it's a no brainer to shoot at F/...
Delta Oscar Uniform's user avatar
Delta Oscar Uniform
  • 2,019
2 votes
3 answers
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Is diffraction limited aperture independent of lens?

I have always understood diffraction limited aperture as a property of the camera and its sensor, not of the lens. The camera has a certain sensor size and a certain megapixel count, which together ...
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juhist
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1 answer
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What does Canon digital lens optimizer (DLO) do exactly?

Recent Canon cameras (example: EOS RP) have a function called Digital Lens Optimizer (DLO). The Canon Digital Photo Professional (DPP) software also has the same DLO feature. Apparently, DLO is ...
juhist's user avatar
juhist
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1 vote
1 answer
173 views

Is there an online lens diffraction and maximum sharpness table?

I simply want to see an table that lists the lens diffraction limit of each camera. I have came across this well done answer with animated PNG and I realized there i also the perfect sharpness ...
Delta Oscar Uniform's user avatar
Delta Oscar Uniform
  • 2,019
5 votes
1 answer
166 views

What kind of lenses with a "slightly different diffraction behaviour" were used in "large format photography in the 1980s"?

Referring to an interview with a lens expert (Krolop&Gerst Objektivreihe 17/32), discussing diffraction limits. "Es gibt ein paar Spezialobjektive die haben ein bisschen anderes Beugungsverhalten,...
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rackandboneman
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8 votes
5 answers
2k views

Can the diffraction limit be overcome with superresolution?

As the title says, can the diffraction limit be overcome with superresolution techniques? Or is this the absolute hard limit in optical photography without making special assumptions? If this is the ...
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Kapt. Brackbier
  • 121
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1 answer
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What is the Nikon D3200's diffraction limit?

I'm new to the world of macro so do bear with me! I shoot pictures of fish through aquariums, so normally this means the lens is always perpendicular to the glass surface to avoid blurring. However ...
HelloWorld's user avatar
HelloWorld
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7 votes
6 answers
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Does sensor size impact the diffraction limit of a lens?

My understanding of diffraction, is that with a small aperture the 'airy disk' (which I understand is the pattern light from a given direction relative to the lens will form on passing through the ...
Kiah's user avatar
Kiah
  • 987
10 votes
5 answers
2k views

Circular polarizer works great at shorter focal lengths, but significantly degrades the image at longer lengths. Why?

I bought a cheap CP recently to play around with, and noticed an interesting phenomenon: Using it with my 24mm lens on full-frame, images turn out tack-sharp - there is hardly any difference in ...
Nathan's user avatar
Nathan
  • 201
2 votes
2 answers
749 views

Haida ND 3.0 (10 stops) filter issue or normal blur?

Yesterday I had a chance to try for the first time the Haida ND 3.0 filter I bought on Amazon with my filter holder. This is this filter: Haida ND 3.0 HD2505D: http://www.amazon.com/gp/product/...
Mathieu Carbou's user avatar
Mathieu Carbou
  • 31
8 votes
1 answer
893 views

Can deconvolution reverse softness caused by diffraction?

I'm aware that diffraction limits the maximum optical resolution of any lens, especially when stopped down to very small apertures. Some camera manufacturers, such as Pentax and Olympus, have ...
bwDraco's user avatar
bwDraco
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1 vote
3 answers
2k views

How does sensor size impact depth of field and diffraction for macro photography?

Macro photographers often stop down to very small apertures to maximize the razor thin depth of field when operating at such close focus distances. Smaller sensors have greater depth of field than ...
Icycle's user avatar
Icycle
  • 734
7 votes
5 answers
1k views

Unable to get sharp landscape picture

I'm facing often the same kind of trouble when taking landscape pictures... I end up with a picture that could be great but that is totally not sharp ! Example : I set up the maximal focal distance ...
Andy M's user avatar
Andy M
  • 642
5 votes
4 answers
10k views

Are there any lenses have smaller apertures than f/32?

While most photographers prefer fast lenses that range down to f/1.2, are there any lenses that go smaller than f/32? If there are, what is so special about those lenses that an aperture of f/32 ...
Jez'r 570's user avatar
Jez'r 570
  • 2,298
4 votes
1 answer
1k views

Does increased resolution compensate for diffraction?

Given a sensor size, the diffraction limit (and cut-off) are determined largely (entirely?) by the density of pixels on the sensor. With the trend of ever-increasing megapixel counts, this means that ...
Chinmay Kanchi's user avatar
Chinmay Kanchi
  • 2,366
6 votes
3 answers
826 views

Is there any way starburst diffractions could be captured with a fixed f/2 smartphone lens? [closed]

There's been some controversy surrounding the publicity camera samples for Nokia's new flagship smartphone, the Lumia 920. First it was shown (and admitted by Nokia) that the stabilised video footage ...
Mark Whitaker's user avatar
Mark Whitaker
  • 8,920
6 votes
1 answer
333 views

Is diffraction an issue with macro lenses?

I'm looking to try out macro photography and have a rental of the Canon 100mm 2.8L IS and the MT-24EX flash to try out on my Canon 7D. I've been reading that with the flash, you can stop down to ...
AndyML's user avatar
AndyML
  • 3,185
25 votes
4 answers
1k views

Do very short shutter speeds result in diffraction?

I'm curious if very short exposure times (say 1/8000 or even 1/16000) would cause noticeable blur due to diffraction. To achieve very fast shutter speeds focal-plane shutters start to close the ...
benjy's user avatar
benjy
  • 353
14 votes
1 answer
2k views

Does focal length affect diffraction, in addition to aperture?

The reason I ask is that f/18 on a 24mm lens = 1.5mm, and f/18 on a 180mm lens = 10mm. I thought diffraction is due to the small physical size of the aperture, rather than the f-ratio, yet I only ever ...
rapscalli's user avatar
rapscalli
  • 1,436
26 votes
4 answers
3k views

Do smaller apertures provide more depth of field past the diffraction limit, even if peak sharpness suffers?

In Understanding Exposure (3rd edition, on page 48), Bryan Peterson has what might be called a rant against modern on-line conventional wisdom about diffraction limits. Answers on this web site are ...
mattdm's user avatar
mattdm
  • 144k
69 votes
7 answers
24k views

What is a "diffraction limit"?

I've seen the term used, but what is a "diffraction limit", when should I worry about it, and what undesirable effects are a result of it ?
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rfusca
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