Learning to love my K-5 all over again: Agapanthus.

Discussion in 'Nature' started by kyteflyer, Dec 13, 2011.

  1. You know its coming up to Christmas when the Agapanthus starts to bloom. Mine is always a bit later than everyone else's because its in shade a lot of the time.

    Shot this with the K-5 and my now quite elderly MC Rokkor f/1.4 50mm lens. It was left over from my film SLR days. I love the really thin DoF that I can get with this, and some of my other prime lenses.

    View attachment 45948
    Agapanthus by kyte50, on Flickr

    Its actual focal length is a bit of a mystery. Its 50mm in the old money, but I have to use an adapter for it to work on the Pentax, and the adapter has some glass in it, which will affect the optics and f/l, not to mention the difference because its a full frame lens on a crop sensor.

    I tried to get the same shot from my 50-200 zoom, and found that I had to shoot at 125mm (f/4), and even that did not quite make it. I need to find some easy way to check the real focal length of this lens, not that it matters that much, but I am curious.
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  2. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    I don't think I know the Agapanthus, but I do know that this is a fascinating close up of a beautiful flower. The "thin DOF" is quite stunning, Sue!
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  3. Thanks, BB, I am gaining a new appreciation of a DoF which actually excludes some parts of the subject, emphasising only a small portion. Its just a different way of looking at things, and I'm working on it :)
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  4. snkenai

    snkenai All-Pro

    Oct 5, 2010
    kenai, AK
    Stephen Noel
    Don't have the K5, but do have the K20 and after using the smaller cameras without the VF, I am back to the wonder of the old film days and good MF lenses. The Tak 55 f2.0 (m42 with adapter) I'm using, is giving that smooth OOF background that causes the main subject to really stand out. I feel like a photographer again. Still like the smaller cameras for "with you all the time" use.
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  5. bartjeej

    bartjeej Hall of Famer Subscribing Member

    Nov 12, 2010
    perhaps you could make a shot of a sheet of paper with square lines (like they use in math class), with the lens parallel to the paper, and measure the angle between the line that could be drawn on the paper so that it'd just be on the left hand side of the photo, and the corresponding line on the right hand side. That way you'd know the horizontal field of view, and I'm sure you could look up on the internet which diagonal FOV, and thus effective focal length, corresponds with that...
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  6. Ditto on the small cameras, I'm really chuffed with the XZ, Ricoh and F550. But I love the K-5 and breaking out the old lenses, even with an adapter, gives me a sense of how it used to be for me. No digital help there, and no auto anything :)

    To be honest, I just can't be bothered to go to that much trouble. I guess my curiosity isnt that strong after all :) but, thanks for the suggestion and I will keep it in mind if I change my mind. In the meantime its a nice short (if a bit heavy) lens with a focal length I would have to pay lots to get, in a prime. Just have to re-learn to use manual settings. I've gotten lazy with all these autofocus this and auto shutter that.
  7. nikki

    nikki Top Veteran

    Sep 12, 2011
    Dublin ,Ireland
    I just bought a k20d as I had loads of pentax k mount lenses so dying to get out to try it! Its very very heavy after using compact cameras for so long :frown: dont think ill be bringing it anywhere unless im going in the car!
  8. snkenai

    snkenai All-Pro

    Oct 5, 2010
    kenai, AK
    Stephen Noel
    With only one small prime, it's not so bad. You gradually get use to it.
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  9. thekeddi

    thekeddi Top Veteran

    Aug 15, 2011
    South Australia
    Great photo again Kyte!!! I love flower closeups like that :)

    I took a few the other day with the EP3 bt haven't done anything with them yet, you have inspired me to do something lol :)