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Archive 2014 · When revering lenses is longer or shorter better

  
 
ergosyn
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p.1 #1 · p.1 #1 · When revering lenses is longer or shorter better


I have 28mm, 50mm and a 135mm. I want to get a reverser ring to try out some macro shots but am not sure what focal length would be best to reverse. Does more zoom one way give you more zoom the other way?


Mar 10, 2014 at 07:39 PM
cbbr
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p.1 #2 · p.1 #2 · When revering lenses is longer or shorter better


A shorter lens gets you more magnification, but less working room. The 50mm is a good place to start IMO.


Mar 10, 2014 at 08:01 PM
ergosyn
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p.1 #3 · p.1 #3 · When revering lenses is longer or shorter better


cbbr wrote:
A shorter lens gets you more magnification, but less working room. The 50mm is a good place to start IMO.


By less working room do you mean a thinner dof? Or that you have to be closer to focus?



Mar 10, 2014 at 09:42 PM
cbbr
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p.1 #4 · p.1 #4 · When revering lenses is longer or shorter better


Both actually. The greater the magnification, the thinner the DOF and the closer you will be to your subject. I have a couple of Nikon 55mm micros that I use with the reversing ring, but its difficult and lighting is no easy task. It is fun though. I am certainly no expert on it (I shoot 90% of my macro at 200mm), so hopefully someone will chime in who actually does it a lot.


Mar 10, 2014 at 09:53 PM
Fred Meebley
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p.1 #5 · p.1 #5 · When revering lenses is longer or shorter better


I've had some success mounting a 50 backwards on the front of my 135.


Mar 10, 2014 at 10:04 PM
ergosyn
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p.1 #6 · p.1 #6 · When revering lenses is longer or shorter better


Fred Meebley wrote:
I've had some success mounting a 50 backwards on the front of my 135.


For macro are you mounting a front facing lens to a reversed lens or just attaching a reversed lens directly onto the camera lens mount?



Mar 11, 2014 at 04:28 PM
Fred Meebley
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p.1 #7 · p.1 #7 · When revering lenses is longer or shorter better


No the 135 was mounted normally, and the 50 was reversed and just held in front of the 135. You can also just mount a reversed 50 to your camera.


Mar 24, 2014 at 07:40 AM
e6filmuser
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p.1 #8 · p.1 #8 · When revering lenses is longer or shorter better


ergosyn wrote:
By less working room do you mean a thinner dof? Or that you have to be closer to focus?


For a given magnification and aperture combination, the DOF will be the same, whichever lens you use. The main advantage of a wideangle lens is that a shorter extension is needed for a given increase in magnification.

Also, any lens, including specialised macro lenses, has an optimum magnification range and its performance will peak at one or two apertures. That may be different when reversed. Keep this in mind for when you are optimising your results but be more relaxed about trying out reversed lens macro.

Harold



Mar 25, 2014 at 03:29 AM
higginb
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p.1 #9 · p.1 #9 · When revering lenses is longer or shorter better


I agree with CBBR, start out with the 50mm reversed. Typically the more distance you have between the lens and the subject (I.e., working distance) the easier it is to get the camera, tripod and flash, if used, into position.


Apr 06, 2014 at 06:11 AM
higginb
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p.1 #10 · p.1 #10 · When revering lenses is longer or shorter better


ergosyn wrote:
For macro are you mounting a front facing lens to a reversed lens or just attaching a reversed lens directly onto the camera lens mount?


The reversing ring, sometimes called a male to male coupling ring, is threaded on both sides so will need to buy a ring that matches the filter size of your 135 on one side and your 50 on the other side. Mount your 135 normally to your camera, screw in the reverse ring to the front of the 135, then "reverse" the 50mm and screw it onto the threads of the reversing ring. Basically the 50mm is used just like a screw on close-up filter. This combination provides a magnification of 135/50 = 2.7X on a camera with a full size sensor.

If you reversed the 28mm then the magnification on a camera with a full size sensor would be 135/28 = 4.8X



Apr 06, 2014 at 06:40 AM
e6filmuser
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p.1 #11 · p.1 #11 · When revering lenses is longer or shorter better


When you mount a lens on the front of a lens mounted on the camera, whether the additional lens is reversed or not:

The lens attached to the camera is often refered to as a "tube lens". In this function it need not be of very high quality. Using that search term, especially in photomacrography.net, will get you some guidance.

The attached lens does need to be of very high quality and you may get better results with a microscope lens, obviously not reversed, than from even a very high quality macro lens at the higher magnifications.

Harold



Apr 06, 2014 at 08:44 AM





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