A 5X magnification stack attempt

Discussion in 'Photography Forums' started by onefivenine, Jun 4, 2008.

  1. onefivenine

    onefivenine
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    Shot quite a few bugs yesterday, before a night-shift in work. Just got home and tried a quick stack. Not the best - still not got a focus rail - but thought I'd share it as these critters aren't often seen eating according to my learned macro pal.

    Red Spider Mite (appx 1mm body length)
    [​IMG]
    ISO100, f/6.3, 1/250, 65mm, 5:1 magnification, 3 shot stack
     
  2. johnaalex

    johnaalex
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    Impressive stuff Dave. I have not much of an understanding of this technique. How much time is there between each shot?
     
  3. jomike

    jomike
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    Nice stuff Dave :smashin:

    As a matter of interest, why f6.3 and not higher for max DOF? I assume you used flash so light should not be a problem.

    Mike
     
  4. onefivenine

    onefivenine
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    Thanks John. Just a split second between shots - long enough for me to move the lens a minute amount each time.

    Cheers Mike.

    Two reasons really.

    1) The lens doesn't transmit magnification data for the image Exif... so to help me remember what magnification the MP-E was at for any shot I always shoot at:-
    Magnification - Aperture
    1x - f/11
    2x - f/9
    3x - f/8
    4x - f/7.1
    5x - f/6.3

    2) More importantly, diffraction softness at higher magnifications means that you have to increase the aperture (lower f-number) at higher magnification to maintain sharpness.

    I think this is due to the 'effective aperture' also, where

    Effective f-number = f-number x (Magnification+1)

    So f/16 on the dial at 5x magnification has an efffective aperture of f/96 :eek:

    Sounds great but the total DOF at f/16 and 5x mag is still only 0.269mm (which decreases to 0.048mm at f/2.8 and 5x).

    My f/6.3 @ 5x is more like f/36 in terms of light loss. This is another reason why the lighting in macro is so crucial and the MT24-EX is such a god-send, not only to help see the subject with the focus lamps, but also to freeze it if I need to reduce the Tv to eg 1/30 at ISO400 to expose for the background.

    :)
     
  5. Tobers

    Tobers
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    Nice one. Lots of detail - I know how hard focus stacking can be.

    That's not your carpet is it? :rotfl:
     
  6. onefivenine

    onefivenine
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    Ha ha! :D

    No, the background is lichens and moss on a red-brick wall.
     
  7. dancingmatt

    dancingmatt
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    Focus stacking is where you blend photos taken at different focus lengths, right? How can you say this is 5:1? And did you use a tripod - I'm just astonished it didn't move in between shots!
     
  8. onefivenine

    onefivenine
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    Yes, this is 3 shots with slightly different focus points combined using CombineZM.
    It was taken at the 5:1 focus point on the MP-E 65mm f/2.8 1-5x Macro lens.
    No tripod, taken handheld resting the end of the lens on the wall it was sitting on.
    . These things are usually scurrying around but this one was feeding so going nowhere for a while.
     
  9. tontoshorse

    tontoshorse
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    Thats clever stuff and produces excellent results. I have trouble remembering what iso I have.;)
     
  10. onefivenine

    onefivenine
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    Thanks TH.

    It's not a great stack TBH. I still haven't done one that I'm happy with. You can clearly see a gap between the focussed areas near the bottom of the image, a thin slice which is out of focus, just a few hundreds of a millimetre but enough to be annoying.
     

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