Reverse lens mounting

Discussion in 'Beyond the Basics' started by rwalsh81, Dec 15, 2017.

  1. rwalsh81

    rwalsh81 TPF Noob!

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    So I'm going for a little more "Oomph" with my macro and about to start reverse lens mounting, (I've got a reverse mount on the way). IF I also add on my extension tube will that do anything at all or is that just going to be a waste?


     
  2. petrochemist

    petrochemist No longer a newbie, moving up!

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    Reversing a lens on extension tubes will bring the focus closer & make the image bigger than reversing the same lens direct on the body.

    BTW in case you don't already know reversing is best for short focal length lenses especially retrofocus designs (most SLR lenses of 50mm & less).

    You can also reverse a lens in front of another lens - effectively using the reversed lens as a highly corrected close up filter. Not all lens combinations work well but very high magnifications can easily be reached this way :)
     
  3. rwalsh81

    rwalsh81 TPF Noob!

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    Ok cool thanks. I'm still a little new to this but thought this was a little more technical than the basic board. I can't wait till my reverse ring comes in on Monday. With mounting a lens to a lens how would I do that a second reverse ring?
     
  4. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    You mount two lenses together using a special filter ring. It has the filter threads on both sides, one for each size filter used for the two lenses.

    You install the longer lens on your camera, and the shorter FL lens reversed in front of it.

    However, you may find you'll need to hold the reversed lens' aperture open if it's the type that closes when it's not on a camera.
     
  5. rwalsh81

    rwalsh81 TPF Noob!

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    Cool thanks, I just found the mounts and ordered two of them one for each filter size I'm using.
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    You need ONE filter ring. One side will have one size threads for one lens, and the other will have the filter size of the OTHER lens you're using.

    If you have, say, one lens with 67mm and other with 58mm, you order ONE ring that's 67mm on one side and 58mm on the other. NOT a 67/67 and a 58/58.
     
  7. rwalsh81

    rwalsh81 TPF Noob!

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    I ordered on 58/58 and one 58/67.
     
  8. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Ok. So you have three lenes?
     
  9. petrochemist

    petrochemist No longer a newbie, moving up!

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    A 58/67 coupling ring & a 58-67 step-up ring would have given you the same effect while also allowing you to use 67mm filters for all your lenses. Only a minor gain but it's especially useful to know for when you can't find a coupling ring for the filters you have...

    Your existing lenses are likely to be without aperture rings so are not ideal for reversing - aperture control on some modern lenses is very awkward once off the camera!
     
  10. OldManJim

    OldManJim No longer a newbie, moving up!

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    Some excellent advice here. You might find that older lenses are easiest to use because of the aperture ring. Most lenses are sharpest at f8 - but that really depends on the lens.

    Once you have this setup, you might find the working distance is small and positioning lighting can be a problem. In that case, a reversed enlarging lens can be quite useful. I find that with a 50 mm Rodagon reversed at f8, I have a working distance of about 3" and a magnification around 3-4X (haven't calculated that exactly.).

    Have fun!
     
  11. snowbear

    snowbear Big Furball Supporting Member

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    And for those that may want to try this and don't have the coupling ring . . .

    [​IMG]
    cmw3_d40_5541
    by Charlie Wrenn, on Flickr

    This method is probably best used with lenses having the same filter size.
     
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