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Thread: 50 macro + converter

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    Default 50 macro + converter

    Does anyone here use the DZ50mm macro with the Olympus teleconverter for macro. \"100\" macros are ok but I really prefer something longer for a lot of my shots. I know Olympus is bringing out a longer macro. Does anyone know what focal length?
    thanks
    barondla

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    Default Re:50 macro + converter

    According to the road map it says 100mm.
    I have used the teleconverter with the 50mm it is a nice bonus on distance, and quite compact.
    T

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    Default Re:50 macro + converter

    Hi barondla,

    I have used my EC-14 teleconverter quite a few time with my ZD 50mm f2.0 macro lens (and my ZD 150mm f2.0 lens). The combination works very well and you still have a decent max aperture of f2.8.
    Best regards, FL

    Pursuing excellence...

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    Default Re:50 macro + converter

    I do agree with barondla. Also had good experiences with the combo. Unfortunately you loose a bit of speed, but in general I\'m happy about the add. length which also gives you more working-distance, which in return betters the chance for lighting and distance for insects...
    Jan
    E-1, E-5, E-M1, 2.8/7-14mmPro, 2.8/12-40mmPro, 2.8/40-150mmPro, MC14, ED lenses: 4.0/7-14mm, 2.8/14-54mm,2.8-4.0/12-60mm, 2.0/35-100mm, 4.0/40-150mm, 2.8-3.5/50-200mm, 2.0/50mm, EC-14, FL-50, FL-36R, some other OM Zuiko manual lenses
    www.flickr.com/photos/jan-krux

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    Default Re:50 macro + converter

    Anyone have any examples for our poster?
    T

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    Default Re:50 macro + converter

    All you need to do is view Andre\'s portraits and it\'s more than enough to convince anyone how good the lens is.

    Andre Knudsen\'s DPR Post

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    Default Re:50 macro + converter

    What is the magnification factor when the teteconverter is added?

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    Default Re:50 macro + converter

    the 1.4 Tele makes the lens from a 50mm 2.0F to a 70mm 2.8F.
    I don\'t understand your question.

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    Default Re:50 macro + converter

    totetuti wrote:
    What is the magnification factor when the teteconverter is added?
    1 : 1,4 (1,4 : 1 compared to macro in 35mm film)

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    Default Re:50 macro + converter

    totetuti wrote:
    What is the magnification factor when the teteconverter is added?
    Hi totetuti,

    I\'ll have a go at your question, too. By itself, the ZD ED 50mm f2.0 macro prime lens has a maximum magnification factor of 0.49x. This is measured at the lens\' closest focus distance of 9.45 inches or 24 cm when the subject is the largest it can possibly be and be in focus. Add an EC-14 and you make the image 1.4x (140%) larger. So the maximum magnification factor would be 0.49 x 1.4 = 0.686. If this line of reasoning is correct, the ZD ED 50mm lens will have a max mag factor of 0.69x at its closest focus distance with the teleconverter.

    Another way to increase the magnification and make the subject larger is to get the lens closer to the subject. But you have to move the minimum focusing distance closer and that\'s what the EX-25 extension tube does. By moving the lens farther from the focus plane of the camera, it shifts the focus range closer and you can increase the max mag factor to 0.98x. But you have to give up something in the process. By shifting the focus range closer, you lose the ability to focus on subjects far away.

    These magnifications are also expressed as ratios. A 0.48x magnification is expressed as 1:2 (note: it is rounded because a perfect 1:2 would be 0.50x). A 0.98x magnification is 1:1. With the EC-14 the 0.69x magnification is 1:1.45 (close to 1:1½).
    Best regards, FL

    Pursuing excellence...

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    Default Re:50 macro + converter

    Well, I was wondering if the TC would change the min focus distant in such way that may or may not affect the magnification...
    Assuming that the thin lens formula applies, the 50mm by itself has .5 mag (which give min focus at 15cm) > the image should form b/w 50mm to 75mm behind the lens so when the 1.4xTC is added, here I do make certain assumption about the design of the TC, it probably results in the image forming b/w 70mm to 105mm behind the lens. Hence the min focus distant for the combo would be 21cm (where the min focus of the 50mm by itself was 15cm) and the mag is still .5.
    Of course the above calculation is based on a simple lens design, just to demonstrate how a TC may or may not change the min focus distant and/or the mag factor. I wonder how the lens design can change the these factors... My original question was does the TC change the mag factor of the 50mm+TC? I don\'t think it does, eventhough the thin lens formula doesn\'t apply strictly but the principle remains the same but I just want someone with these pieces in hands to verify... Thanks!

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    Default Re:50 macro + converter

    The EC-14 does not change the min focus distance. If I remember correctly, the min focus distance is measured from the optical center of the lens rather than the focus plane of the camera. Adding the EC-14 between the camera body and the ZD 50mm lens obviously moves the lens forward and the optical center of the lens along with it.
    Best regards, FL

    Pursuing excellence...

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