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    Forum: General Discussion Sep 7, 2010, 5:01 PM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    Yeah, well you can do it handheld or use one of...

    Yeah, well you can do it handheld or use one of the motorized panoramic heads. Which seems more sensible to me. Sure as heck beats a scanning back, or even medium format digital.

    Take a Sony A850...
    Forum: General Discussion Sep 4, 2010, 9:45 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    No, it's not my preconceptions. With a...

    No, it's not my preconceptions.

    With a pinhole you have an f-stop of say f500, a focal length of say 50mm.

    The aperture is so small that whatever CoC you choose the DOF extends from just a...
    Forum: General Discussion Sep 3, 2010, 10:33 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    Talk about a circle of confusion!! :O

    Talk about a circle of confusion!! :O
    Forum: General Discussion Sep 3, 2010, 2:57 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    LOL. You crack me up dude. Of course this is...

    LOL. You crack me up dude.

    Of course this is simply a good-natured academic exercise.

    We all know how to get the results we want. If you want less DOF - get a longer lens and use a wider...
    Forum: General Discussion Sep 2, 2010, 5:30 PM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    TCav, Apparent DOF is poorly applied to...

    TCav,

    Apparent DOF is poorly applied to drawings, etc. It is a very specific notion that applies to photography.

    Unless you can tell me what the focal length, aperture, focus distance and...
    Forum: General Discussion Sep 2, 2010, 5:23 PM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    This is correct. But notice my original...

    This is correct. But notice my original psychological observations refer only to the context in which the discussions are held, they do not refer to the equations. There is nothing "touchy-feely"...
    Forum: General Discussion Sep 2, 2010, 5:08 PM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    Apparent DOF is a function with FOUR inputs. ...

    Apparent DOF is a function with FOUR inputs.

    DOF = f(CoC, Focal Length, F-stop, Focal distance)

    CoC = f(Enlargement, Visual Acuity, Viewing Distance)

    Enlargement = f(sensor size, print...
    Forum: General Discussion Sep 2, 2010, 9:22 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    At a guess - your camera was focussed maybe 24"...

    At a guess - your camera was focussed maybe 24" from the lens?

    With such a close focus distance and an 85mm lens @ f4 you can pretty much change the CoC to crazy levels and not get a very...
    Forum: General Discussion Sep 2, 2010, 9:08 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    I do think tclune has a point though. ...

    I do think tclune has a point though.

    Possibly I should have used the word "normative" in some of the places where I have used "subjective".

    The main place I was trying to get to is to...
    Forum: General Discussion Sep 2, 2010, 8:53 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    As it happens I went to the Photographers'...

    As it happens I went to the Photographers' Gallery last night to see the Sally Mann exhibition they have on. (Very highly recommended btw! for those of you who can get to London.)

    With some of...
    Forum: General Discussion Sep 2, 2010, 3:10 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    Okay. So. We know that focus on most lenses...

    Okay. So.

    We know that focus on most lenses is a PLANE. Lens makers try to make that plane flat, but sometimes it has curvature. But that plane is the only place where the lens is in perfect...
    Forum: General Discussion Sep 1, 2010, 10:17 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    For reference: ...

    For reference:

    http://en.wikipedia.org/wiki/Circle_of_confusion

    In particular:
    Forum: General Discussion Sep 1, 2010, 3:20 AM
    Replies: 59
    Views: 5,691
    Posted By peripatetic
    DOF - spin off from Superzoom v DSLR.

    Oh goody, a DOF thread. We haven't had one of those for a while... :-)

    There are number of psychological factors to grasp first:

    1. People find it much easier to get the practical results they...
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