Getting use to filters.

Discussion in 'Photography' started by brett, May 2, 2005.

  1. brett

    brett Guest

    I'd like comments on any of these photos (good, bad, mean, etc):

    I know the two flowers are out of focus but I'm working more on my
    closeups. One problem is what I see in the view finder looks good but
    is actually out of focus some what. Any suggestions for better
    identifying this? It's very subtle.

    P5010049 and P5010050 are my favorites. Especially interested in what
    you think of those.

    brett, May 2, 2005
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  2. brett

    James Banks Guest

    They look good overall, The issue with your flowers may be the same problem
    I tend to have where I get closer to the subject than the lens will focus.
    Also, is your diopter tuned into your eyes, if focusing manually this can
    affect the overall results. Lastly, through experience I have found that
    for closeups a tripod is pretty much anecessity and even then when shooting
    in lower light with a longer exposure time a remote relese may be needed to
    eliminate any camera vibration.
    James Banks, May 2, 2005
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  3. brett

    brett Guest

    Thanks James. I'm planning on using the tripod from now on with the
    closeups. I see they are very tedious and require much care.

    What did you mean by this, "is your diopter tuned into your eyes"?

    Diopter: a unit of measurement of the refractive power of a lens equal
    to the reciprocal of the focal length in meters.

    I don't see how the above can be turned into my eyes if it is a unit of
    measurement. I am focusing manually.

    brett, May 2, 2005
  4. brett

    paul Guest

    The camera viewfinder has an adjustable diopter if you wear glasses.
    paul, May 2, 2005
  5. brett

    paul Guest

    Sorry but I don't get the color filter concept. Are you sure that red
    graduated one isn't for B&W to darken the sky? Really they just look
    strange to me.

    I think your flower closeup problem is the camera's autofocus chosing
    the closest part of the flower which is just one bit of petal on the
    bottom. On my old digicam, for macros, I'd lock the focus to manual at
    the closest distance & move the camera in & out to focus. Of course if
    you are using film, you have manual focus. Also figure out how to adjust
    the f/stop in aperture priority mode ('A' mode) and use a larger number
    if you have enough light, that way you'll have more depth of field, or
    at least arrange the angle so the subject is flat to the lens without
    paul, May 2, 2005
  6. brett

    Brett Guest

    That's the technique I use with manual focus. It's a digital SLR camera.
    Nice. Thanks.
    Brett, May 3, 2005
  7. brett

    Richard H. Guest

    And often add-on diopters if your prescription is strong. (This all
    presumes you want to shoot with your glasses off.)

    Caveat: If you have an astigmatism, the eyepiece can't correct for it,
    so learn to shoot with your glasses on. I was about to craft a custom
    eyepiece when I discovered that astigmatism is orientated a specific
    direction - turn your eyeglass lenses 90 degrees and you'll see what I mean.
    Richard H., May 3, 2005
  8. brett

    Richard H. Guest

    Ditto. With a macro lens, you almost have to focus this way - much
    easier to fine-tune the focus in macro by moving the whole camera.

    Play around to find the effect you like. In most cases, I like shallow
    depth of field to draw the eye to a specific part of a picture and throw
    the background out of focus (sometimes extremely). For example, you
    might want all the petals in focus, but not the background leaves.

    With P5010050, you can see the effect, but a bit extreme. It clearly
    shows the viewer what they should be focused on - in this case, the
    front edge of the stalk (?), which isn't quite recognizable as a
    subject. A little more depth of field (slightly higher F number) would
    reveal a little more of the subject, adding some environmental context
    and making the subject more recognizable.

    Compare also the focus on P5010052 and P5010049 - I like 49 because the
    focus is more artistic. The foreground is out of focus (which is
    "different" than typical), and the eye is drawn to the focal point on
    the right side where the band of reflection and the crisp edge of the
    lettering makes it more pronounced.
    The effect is less noticable in 52, perhaps becuase of a higher F-stop
    or simply because the foreground of the object is in focus and the rear
    is not, as folks are more accustomed to seeing.

    FYI, you will also notice that the effect of F-stop varies by the length
    of the lens. I.e., low F-stop with a short lens can yield an extremely
    shallow depth of field like in your flower photos (only part of a petal
    in focus). In contrast, with a long zoom lens it will have much less
    effect (e.g., one player on focus on a football field).

    Thanks for sharing!

    Richard H., May 3, 2005
  9. brett

    Brett Guest

    Right. I'm learning how to gain more control over F-stop (focal length =
    Lens length / lens width).
    Brett, May 3, 2005
  10. brett

    Brett Guest

    Sometimes, because of the position needed for certain shots, I'm using the
    LCD on the closeups. Is that a no, no or have any disadvantages?

    Brett, May 3, 2005
  11. brett

    Richard H. Guest

    I suppose that'd depend on whether you want to leave the focusing to
    auto-focus. Resolution of the LCD is nowhere near optical lens quality
    for focusing purposes.

    Personally, I couldn't manually focus with an LCD display - I have to
    zoom the LCD to ~8x just to see the crispness that I'd otherwise see
    with my eye through the viewfinder. I find the LCD is handy for a)
    composition, b) proofing the image in the field (zooming areas of the
    image to check focus after the shot), c) candid shots where having the
    camera to your eye causes the subject to stop doing that cute thing
    you're trying to photograph. :)

    Also, if you're using an SLR model, there's usually a button for
    checking depth of field - press it and the aperature closes to the
    specified F-stop. The image will get dark at high F-stops, but you can
    see what objects will come into focus. (The lens is normally at
    full-open / lowest F-stop until you release the shutter.)

    Richard H., May 3, 2005
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