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Olympus OM-D E-M5 The first Micro Four Thirds camera from Olympus with an integrated Electronic Viewfinder

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Old 18th June 2017
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Re: Diffraction Testing.

BTW, thinking of McCullin's experience, has anyone heard Woody Allen's stand-up routine about the bullet in his breast pocket that saved him from being killed by a falling Bible?
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  #17  
Old 19th June 2017
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Re: Diffraction Testing.

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Originally Posted by drmarkf View Post
... it is true that diffraction is a significant issue at f22 (when you're trying to get a shutter speed around 1/15th and, even at ISO64, it's too damn bright and you've forgotten to bring an ND filter).

e.g. have a look at the crowd ...
Could 1/15s be the reason, or is that sensor stabilisation so good that it should produce a sharp image in the absence of diffraction.
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  #18  
Old 19th June 2017
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Re: Diffraction Testing.

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Originally Posted by Ricoh View Post
Could 1/15s be the reason, or is that sensor stabilisation so good that it should produce a sharp image in the absence of diffraction.
I certainly considered that, Steve, and there might be an element of shake of course, but I took 13 frames of assorted boats going past there at 15 and 23mm, and f22/ASA64, and the shutter speed varied between 1/15th and 1/20th. This was with the E-M1ii and Panny 12-35, using body IS-Auto. I had focussed roughly in mid-stream and obviously was holding the camera as steady as I could. That image has had some reduction in clarity, structure and contrast selectively over the boat & oarsmen, but nowhere else.

All of the shots look basically the same, but if there is any consistent difference it is between those at 23 and 15mm, with the former looking better in the background (the one I showed is a modest crop of a 23mm one - it's around 90% of the frame width). That would be consistent with diffraction being less at longer focal lengths (I don't know if that's a characteristic of that lens), but you'd expect variation if it was camera shake, and worse at longer FLs, surely?

Certainly, I'm very happy handholding that camera-lens combination at around 17mm at 1/15th in the street in the evening or when I'm after subject blur, and it's something I do all the time. I don't count & measure this sort of thing, but I'd estimate well under 10% of my shots like that would show unacceptable background blur. I regularly handhold in the street at 1/10th, in fact, with both the 12-35 and Panny 15 (ignoring what is possible with the 12-100, of course!).

The next time the opportunity arises I'll test this out a bit more formally, comparing with c.f8 with an ND filter.

I could think of some scenarios where a bit of overall softness would actually look quite good, so it would be good to know for sure.
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  #19  
Old 19th June 2017
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Re: Diffraction Testing.

Mark, I'm sure you are well aware of the relationship between 1/FL and SS, whilst factoring for u4/3 sensors. Although it's possible to use a slower shutter speed with a stabilised sensor, I would be inclined to apply the time honoured formula.

This may be helpful to some reading this: http://www.outdoorphotoacademy.com/a...-sharp-photos/
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Old 19th June 2017
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Re: Diffraction Testing.

Errmmm, yes , but we're talking about deliberate long exposures in order to generate subject blur....
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  #21  
Old 19th June 2017
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Re: Diffraction Testing.

Errmmmmmmm, what about your three legged friend
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Old 20th June 2017
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Re: Diffraction Testing.

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Errmmmmmmm, what about your three legged friend
You mean this one?
EDIT: That was the video, 'Jake the Peg' with three legs, but it seems the joke was not appreciated (except one).
Yes, the guy was convicted etc, but if all talent was thrown out from all with a shady past then I think that would be sad. You've got to admit it though, he did that song & act well.
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Old 20th June 2017
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Re: Diffraction Testing.

Generally its considered bad taste to publicise this convicted and disgraced pedofile .
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Old 20th June 2017
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Re: Diffraction Testing.

Yes, I thought it was in bad taste.
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  #25  
Old 20th June 2017
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Re: Diffraction Testing.

Yes ricoh this will test the stength of the moderator .....Rolff has been found guilty
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  #26  
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Re: Diffraction Testing.

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Yes, I thought it was in bad taste.
Sorry about the bad taste, but I still thought it was funny from a tongue in cheek point of view.
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I fiddle with violins (when I'm not fiddling with a camera).
Cameras: OM-D E-M1 & Mk II, Olympus Stylus 1, OM-D E-M5.
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  #27  
Old 20th June 2017
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Re: Diffraction Testing.

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Originally Posted by Pistnbroke View Post
Yes ricoh this will test the stength of the moderator .....Rolff has been found guilty
Which Moderator would that be ? We have no Moderators on this forum

John
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  #28  
Old 20th June 2017
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Re: Diffraction Testing.

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Originally Posted by Pistnbroke View Post
Generally its considered bad taste to publicise this convicted and disgraced pedofile .
Yes, that was bad taste. I assume that even though Harris is Australian he is not so notorious in Australia as he is here. After all, he has lived here for most of his life, his crimes were all committed here and we feel particularly disgusted, outraged and betrayed because he was such a popular entertainer. So let's not give Ross too hard a time on this one.
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Old 21st June 2017
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Re: Diffraction Testing.

We are not giveing Ross a hard time ..it you that needs a hard time for not removing it.
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  #30  
Old 21st June 2017
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Re: Diffraction Testing.

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Originally Posted by Pistnbroke View Post
We are not giveing Ross a hard time ..it you that needs a hard time for not removing it.

?????? You keep having a go at Zuiko, why? In all the years that he has been an administrator, he has been completely fair and unbiased, and if any dubious or controversial posts crop up, the poster will always get the benefit of the doubt, which is what has happened here!
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