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#71
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hyperfocal settings
On 2013.06.23 17:45 , peternew wrote:
I would not even consider using an in camera hyperfocal computation, for the same reason I prefer manual focus for my macro shots. The reason can hardly be the same. Lenses that provide usable hyperfocal marks (and even aperture driven near/far indexes) are the "computer" with the sole drawback of considering only one enlargement ratio. -- "A Canadian is someone who knows how to have sex in a canoe." -Pierre Berton |
#72
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hyperfocal settings
On 2013.06.23 20:44 , peternew wrote:
On 6/23/2013 5:53 PM, nospam wrote: this is about a camera automatically picking a hyperfocal distance. NO! it was about how to deal with the lack of hyperfocal distance marking on lenses. And when and why automatic selection in the camera is not reliable. This splinter of the thread is about the notion of an in-camera calculated hyperfocal range and autofocus to that point. -- "A Canadian is someone who knows how to have sex in a canoe." -Pierre Berton |
#73
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hyperfocal settings
On 2013.06.24 10:03 , BobA wrote:
In article , peternew wrote: [ ... ] No. It's not a fixed distance. It's a range in whch there is apparent focus. http://en.wikipedia.org/wiki/Hyperfocal_distance The first line of this article: In optics and photography, hyperfocal distance is a *distance* beyond which all objects can be brought into an "acceptable" focus Read it all QUOTE Definition 1: The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp. ENDQUOTE So while objects from h to infinity are "acceptably" in focus so are objects from h/2 to h (and of course out to infinity. -- "A Canadian is someone who knows how to have sex in a canoe." -Pierre Berton |
#74
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hyperfocal settings
On 2013.06.23 17:55 , peternew wrote:
Look at the closest distance for which you get an in focus image for infinity. Then look and se where you are in focus at about 1/3 of that distance at f/16. The area between that point and infinity will be your hyperfocal distance. I have never used an m4/3 lens, but assuming it is like a G ens, the technique would be similar. The above would work as long as you constrain your print size, I suppose. -- "A Canadian is someone who knows how to have sex in a canoe." -Pierre Berton |
#75
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hyperfocal settings
In article ,
Alan Browne wrote: On 2013.06.24 10:03 , BobA wrote: In article , peternew wrote: [ ... ] No. It's not a fixed distance. It's a range in whch there is apparent focus. http://en.wikipedia.org/wiki/Hyperfocal_distance The first line of this article: In optics and photography, hyperfocal distance is a *distance* beyond which all objects can be brought into an "acceptable" focus Read it all QUOTE Definition 1: The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp. ENDQUOTE So while objects from h to infinity are "acceptably" in focus so are objects from h/2 to h (and of course out to infinity. Seriously? Reading the rest of the article doesn't change that the hyperfocal distance is a distance. Of course it's not just any distance. The distance must meet criteria. You have to set the lens to a distance, h -- not a range. The range h to infinity is the acceptable focus criteria. The range h/2 to infinity is the acceptable focus property. Either that, or I need to go back to early grammer school. BobA |
#76
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hyperfocal settings
"Wolfgang Weisselberg" wrote in message ... Dudley, PLEASE do use proper quoting levels! You're writing as if you wrote the stuff I wrote. Dudley Hanks wrote: [snip] There still is, it's called ADEP. Only on some models, not the more advanced ones. It just works a bit differently. Instead of focusing on two points, separately, you just make sure what you want falls within the center cluster of focusing points. Anything with a point on it figures into the DOF calculation. So you need to make sure all your focus points are on the subject. Thus, if the center point is on the horizon, one of the top points is on a closer cluster of leaves, and a left and right point both cover items somewher in beetween, the camera will do its best to render everything from the leaves to the people to the horizon in focus. Not everyone shoots landscape. I haven't used the mode myself, so I can't vouche for how well it works, but, in theory, it could be used for a quick hyperfocal shot. Not everyone shoots hyperfocal. And DEP works for these people, too. -Wolfgang Sorry, Wolfgang. I've recently switched from my old XP equipped computer to one with Windows 7. Subsequently, I no longer have access to Outlook Express. Instead, I am using Windows Live Mail, a program that isn't all that accessable to my screen reader. I have yet to figure out how to set the quoting levels because I can't seem to access all of the optional settings. If I can't figure it out pretty soon, I may resort to my old Perl script I wrote a few years back. Take Care, Dudley |
#77
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hyperfocal settings
"Dudley Hanks" wrote:
"Wolfgang Weisselberg" wrote in message ... Dudley, PLEASE do use proper quoting levels! You're writing as if you wrote the stuff I wrote. Dudley Hanks wrote: [snip] There still is, it's called ADEP. Only on some models, not the more advanced ones. It just works a bit differently. Instead of focusing on two points, separately, you just make sure what you want falls within the center cluster of focusing points. Anything with a point on it figures into the DOF calculation. So you need to make sure all your focus points are on the subject. Thus, if the center point is on the horizon, one of the top points is on a closer cluster of leaves, and a left and right point both cover items somewher in beetween, the camera will do its best to render everything from the leaves to the people to the horizon in focus. Not everyone shoots landscape. I haven't used the mode myself, so I can't vouche for how well it works, but, in theory, it could be used for a quick hyperfocal shot. Not everyone shoots hyperfocal. And DEP works for these people, too. -Wolfgang Sorry, Wolfgang. I've recently switched from my old XP equipped computer to one with Windows 7. Subsequently, I no longer have access to Outlook Express. Instead, I am using Windows Live Mail, a program that isn't all that accessable to my screen reader. I have yet to figure out how to set the quoting levels because I can't seem to access all of the optional settings. If I can't figure it out pretty soon, I may resort to my old Perl script I wrote a few years back. Take Care, Dudley Ah, yes, I found it, and it still works, inspite of a different operating system... Thank you, Peter Wall, Merlin, and the rest of the guys who keep this nice little language available... Gotta love Perl ... Take Care, Dudley |
#78
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hyperfocal settings
BobA wrote:
In article , Alan Browne wrote: On 2013.06.24 10:03 , BobA wrote: In article , peternew wrote: [ ... ] No. It's not a fixed distance. It's a range in whch there is apparent focus. http://en.wikipedia.org/wiki/Hyperfocal_distance The first line of this article: In optics and photography, hyperfocal distance is a *distance* beyond which all objects can be brought into an "acceptable" focus Read it all QUOTE Definition 1: The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp. ENDQUOTE So while objects from h to infinity are "acceptably" in focus so are objects from h/2 to h (and of course out to infinity. Seriously? Reading the rest of the article doesn't change that the hyperfocal distance is a distance. Of course it's not just any distance. The distance must meet criteria. You have to set the lens to a distance, h -- not a range. The range h to infinity is the acceptable focus criteria. The range h/2 to infinity is the acceptable focus property. Either that, or I need to go back to early grammer school. It's hard to determine from what they say if it is the words or the concept of a hyperfocal distance, but clearly Alan and Peter do not understand one or the other; and whichever it is, neither Alan nor Peter are making any sense at all! For the benefit of both Alan and Peter: 1) "Hyperfocal distance" is a *single* distance, not a range. 2) "Hyperfocal distance" is not an area. 3) "Infinity/3" is still Infinity. But as to Peter's curious method of determining hyperfocal distance: "Look at the closest distance for which you get an in focus image for infinity. Then look and se where you are in focus at about 1/3 of that distance at f/16. The area between that point and infinity will be your hyperfocal distance. The first step provides focus at the hyperfocal distance, so what need is there for the rest of that nonsense! Not to mention that those steps absolutely do not provide any clue about the hyperfocal distance. (I'm still wondering how that reference to f/16 has significance!) Here is a very simple chart showing the camera location at C, the Focus distance at F, the nearest point considered in focus at NF, and the far edge of the Depth of Field at Inf. The hyperfocal distance when those conditions are met is the distance from C to F. When all else is constant, the distance from C to F is greater for larger apertures. C NF F Inf | | | | |-----|---------|-----------/~~~/--| | |-----------------------/~~~/--| Depth of Field |-----------------| Hyperfocal Distance Obviously Hyperfocal distance is a fixed distance, not a range and cannot be considered an area. -- Floyd L. Davidson http://www.apaflo.com/ Ukpeagvik (Barrow, Alaska) |
#79
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hyperfocal settings
On 24/06/2013 19:36, Dudley Hanks wrote:
[] Sorry, Wolfgang. I've recently switched from my old XP equipped computer to one with Windows 7. Subsequently, I no longer have access to Outlook Express. Instead, I am using Windows Live Mail, a program that isn't all that accessable to my screen reader. I have yet to figure out how to set the quoting levels because I can't seem to access all of the optional settings. If I can't figure it out pretty soon, I may resort to my old Perl script I wrote a few years back. Take Care, Dudley I was very disenchanted with Windows Live Mail for newsgroups, so I switched to Thunderbird. However, I don't know how "accessible" it would be for you. -- Cheers, David Web: http://www.satsignal.eu |
#80
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hyperfocal settings
On 2013.06.24 14:04 , BobA wrote:
In article , Alan Browne wrote: On 2013.06.24 10:03 , BobA wrote: In article , peternew wrote: [ ... ] No. It's not a fixed distance. It's a range in whch there is apparent focus. http://en.wikipedia.org/wiki/Hyperfocal_distance The first line of this article: In optics and photography, hyperfocal distance is a *distance* beyond which all objects can be brought into an "acceptable" focus Read it all QUOTE Definition 1: The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp. ENDQUOTE So while objects from h to infinity are "acceptably" in focus so are objects from h/2 to h (and of course out to infinity. Seriously? Of course. There is nothing contradictory in that. Reading the rest of the article doesn't change that the hyperfocal distance is a distance. Of course it's not just any distance. The distance must meet criteria. You have to set the lens to a distance, h -- not a range. Nobody said different. Try reading before spouting. -- "A Canadian is someone who knows how to have sex in a canoe." -Pierre Berton |
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