Here's a question for you all...

Discussion in 'Open Discussion' started by AlwaysOnAuto, Feb 12, 2017.

  1. AlwaysOnAuto

    AlwaysOnAuto TalkEmount Hall of Famer

    Feb 17, 2015
    The question asked about what macro lens should I get got me to thinking.
    I have a 55mm macro.
    I have a 2x extender.
    I have a 'tube' for said macro lens.

    What can I expect if I stack them all together?
    Will it give me a 110mm macro lens equivalent?
  2. AlwaysOnAuto

    AlwaysOnAuto TalkEmount Hall of Famer

    Feb 17, 2015
    So here is what that setup looks like on my a7ii.
    And here is what it can do real quicky like from about 10-12" away.

    • Like Like x 1
  3. WNG

    WNG TalkEmount Hall of Famer

    Aug 12, 2014
    Arrid Zone-A, USA
    1. A very long lens.
    2. Yes.

    You now have a 110mm f/5.6 macro with 1:1.
    • Like Like x 1
  4. Tipton

    Tipton TalkEmount Veteran

    Jan 30, 2016
    Rae Leggett
    You can also expect losing a lot of light, maybe some vignetting and razor thin DOF. I tried this experiment and was unimpressed with the results.

    Of course, maybe I should have used a tripod, and not done it on a windy day :) 
  5. davect01

    davect01 Super Moderator Subscribing Member

    Aug 20, 2011
    Fountain Hills, AZ
    Any serious Macro work usually involves a ring light or external light.
  6. AlwaysOnAuto

    AlwaysOnAuto TalkEmount Hall of Famer

    Feb 17, 2015
    That shot of the lens cap is handheld. I'm not about to hang that off my tripod without an auxiliary lens support of some type.
    I set the camera steady shot setting on 120mm and it seems to have worked OK.
    If I remember correctly that is a SOOC jpeg that I posted.
  7. AlwaysOnAuto

    AlwaysOnAuto TalkEmount Hall of Famer

    Feb 17, 2015
    Another question: What would happen if I reverse the order of the 2x extender and the PK-13 tube?
  8. JMM

    JMM TalkEmount Regular

    Jul 29, 2016
    No, it wont be anywhere near to 110macro lens. Your extension tube (which is around 25-30mm lenght i belive) will get you to 1:1 life size ratio at the expense of working distance (effective aperture @1:1 it will equals to 5.6). So in fact you gonna get something like 30mm f2.8 @1:1 instead of 110mm.

    With 2x teleconverter you also gonna get 1:1 lens, but effective aperture @1:1 is now f11. With same working distance, so you get something like equivalent to 110mm f5.6

    So... extension tube is taking away your working distance and teleconverter is eating your light (and you approach difftaction limit territory on wide open).

    Now if you couple extension tube and TC you should get 2:1 lens that could be compared (@2:1) to 50mm 5.6 with EA around f16 - f18 which is way in diffraction territory.

    In theory TC and extension tube order doesnt make any difference, but TC's are designed to sit as close to the lens as possible afaik.
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