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Pontus
Joined: 18 Dec 2011
Posts: 1471
Location: Jakobstad, Finland
Expire: 2016-08-25
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 Posted: Mon Apr 09, 2012 4:56 am Post subject: Diffraction limited aperture in real life |
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Pontus wrote:
I would imagine that the diffraction limits are not so much limits but more the point where you reach optimum performance (sharpness wise). If I want to get the maximum depth of field (a macro shot for example) I still need to use a small aperture. The diffraction limit might mean that the picture is less sharp but at least more of the picture is sharp. More depth of field can give a crisper image because we perceive it as sharper since more is in focus. Just some thoughts over my morning coffee. Is the diffraction thing a bit of a hype?
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poilu
Joined: 26 Aug 2007
Posts: 10472
Location: Greece
Expire: 2019-08-29
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| Posted: Mon Apr 09, 2012 6:47 am Post subject: |
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poilu wrote:
| Quote: |
| I would imagine that the diffraction limits are not so much limits but more the point where you reach optimum performance (sharpness wise) |
exactly, optimum performance (sharpness wise)
| Quote: |
| If I want to get the maximum depth of field (a macro shot for example) |
best macros are at f5.6 with focus stacking to get dof
| Quote: |
| More depth of field can give a crisper image because we perceive it as sharper since more is in focus |
less depth of field give a crisper image because the subject in focus pop
if everything is sharp, image is flat (usually called p&s or phone pic)
| Quote: |
| Is the diffraction thing a bit of a hype? |
for those viewing their pics at 800x600 , yes it is a hype
even an out of focus pic can be made crisp at 800x600 with little sharpening
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ilguercio
Joined: 08 Mar 2012
Posts: 414
Location: Southern Italy-Calabria!
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| Posted: Thu Apr 12, 2012 5:07 pm Post subject: |
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ilguercio wrote:
The trouble really comes early with overcrowded sensors. My 50D is rated to reach diffraction at f/7.1 which is a bit worrying since f/8 and f/11 are still widely useful with wide lenses.
I have yet to do a test between my 50D and my 20D but i'm expecting more detail out of the former since has more megapixels until f/8, then the results should change according to the maths.
I guess one should do some tests with his gear to better understand what are the real limits of the things he's using. Anyway, i never use apertures narrower than f/11 so i'm still within the acceptable. |
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Himself
Joined: 01 Mar 2007
Posts: 3240
Location: Montreal
Expire: 2013-05-30
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| Posted: Wed May 30, 2012 3:38 am Post subject: Re: Diffraction limited aperture in real life |
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Himself wrote:
| Pontus wrote: |
| Is the diffraction thing a bit of a hype? |
It's not a hype at all.
Without this phenomenon photography wouldn't existed.
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visualopsins
Joined: 05 Mar 2009
Posts: 10956
Location: California
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| Posted: Wed May 30, 2012 3:48 pm Post subject: |
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visualopsins wrote:
| poilu wrote: |
[...]
| Quote: |
| If I want to get the maximum depth of field (a macro shot for example) |
best macros are at f5.6 with focus stacking to get dof
[...] |
Depends on sensor, right? f/5.6 for APS-C, f/8 for FF & 35mm film... |
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fuzzywuzzy
Joined: 18 Dec 2010
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Location: Down East, Canada, eh?
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| Posted: Thu May 31, 2012 11:06 pm Post subject: |
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fuzzywuzzy wrote:
| visualopsins wrote: |
| poilu wrote: |
[...]
| Quote: |
| If I want to get the maximum depth of field (a macro shot for example) |
best macros are at f5.6 with focus stacking to get dof
[...] |
Depends on sensor, right? f/5.6 for APS-C, f/8 for FF & 35mm film... |
Dpends on pixel density.
Calculator here: http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm
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Pontus
Joined: 18 Dec 2011
Posts: 1471
Location: Jakobstad, Finland
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| Posted: Thu May 31, 2012 11:32 pm Post subject: Re: Diffraction limited aperture in real life |
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Pontus wrote:
| Himself wrote: |
| Pontus wrote: |
| Is the diffraction thing a bit of a hype? |
It's not a hype at all.
Without this phenomenon photography wouldn't existed. |
I guess I expressed myself poorly. Of course diffraction exists as a physical phenomenon. What I meant was that diffraction limited does not mean that a nice (or even nicer) picture cannot be taken at a smaller aperture than the diffraction limit. I'm trying to say that yes, the optimum sharpness is at the diffraction limit but maybe the picture will look sharper at a smaller aperture because the depth of field is greater. As in architecture or landscape.
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erkie
Joined: 08 Oct 2011
Posts: 308
Location: Missouri
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| Posted: Fri Jun 01, 2012 12:32 pm Post subject: |
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erkie wrote:
We have stopped down to whatever aperture is necessary for the shot for a very long time  . I don't plan on changing that any time soon 
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sichko
Joined: 20 Jun 2008
Posts: 2475
Location: South West UK
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| Posted: Fri Jun 01, 2012 12:36 pm Post subject: |
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sichko wrote:
| erkie wrote: |
| We have stopped down to whatever aperture is necessary for the shot for a very long time . I don't plan on changing that any time soon |
Nicely put.
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