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Question on reverse mounting a Canon 50mm f/1.4 lens

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Thread started 21 Apr 2012 (Saturday) 15:50   
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Suddie1215
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Hi, I have a Canon 100mm f/2.8 macro lens and I would like to reverse mount a Canon 50 f/1.4. Is this possible when the 50 f/1.4 does not have a manual aperture ring?

And if it can be done, how do I get the aperture on to 50mm lens open?

Post #1, Apr 21, 2012 15:50:24




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tonylong
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Suddie1215 wrote in post #14304430external link
Hi, I have a Canon 100mm f/2.8 macro lens and I would like to reverse mount a Canon 50 f/1.4. Is this possible when the 50 f/1.4 does not have a manual aperture ring?

And if it can be done, how do I get the aperture on to 50mm lens open?

The second lens "stays" wide open unless you set it to a different aperture. You do this by mounting the lens, setting the aperture to what you want, then dismounting the lens while the camera/lens is still set to the needed aperture.

Beyond that, I really haven't messed with doing this, so others can chime in and add or totally correct anything bad I've said!

Post #2, Apr 21, 2012 18:21:56


Tony
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LordV
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Just to add, with the lens mounted normally and the aperture set on the camera that you want, you have to press the DOF preview button and then dismount the lens whilst keeping the DOF preview button depressed.
Brian v.

Post #3, Apr 22, 2012 01:14:38


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tonylong
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LordV wrote in post #14306729external link
Just to add, with the lens mounted normally and the aperture set on the camera that you want, you have to press the DOF preview button and then dismount the lens whilst keeping the DOF preview button depressed.
Brian v.

Ah, right, I knew I must have forgotten something! Thanks for chiming in!!!

Post #4, Apr 22, 2012 01:19:24


Tony
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Suddie1215
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Thank you both for the tips. I tried reversing my 50mm on my macro lens yesterday and couldn't get it to work but now I see what I was doing incorrectly.

Another question, to focus I only need to rotate the focus ring for the non-reversed lens, right?

EDIT:

Here's the equipment I'm using: 1D Mk III camera, Canon 100mm f/2.8 macro lens, Canon 50mm f/1.4 lens, mounting ring.

Following the advice from LordV I first attached the 50mm directly to the camera and set the aperture to f/1.4. Then while holding down the DOF Preview button I removed the 50mm and attached the 100mm macro. I reversed the 50mm and screwed it on to the macro lens thread. But try as I might I can't get the combination to focus manually or by autofocus. Any advice greatly appreciated.

Post #5, Apr 22, 2012 11:00:30




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LordV
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Suddie1215 wrote in post #14308191external link
Thank you both for the tips. I tried reversing my 50mm on my macro lens yesterday and couldn't get it to work but now I see what I was doing incorrectly.

Another question, to focus I only need to rotate the focus ring for the non-reversed lens, right?

EDIT:

Here's the equipment I'm using: 1D Mk III camera, Canon 100mm f/2.8 macro lens, Canon 50mm f/1.4 lens, mounting ring.

Following the advice from LordV I first attached the 50mm directly to the camera and set the aperture to f/1.4. Then while holding down the DOF Preview button I removed the 50mm and attached the 100mm macro. I reversed the 50mm and screwed it on to the macro lens thread. But try as I might I can't get the combination to focus manually or by autofocus. Any advice greatly appreciated.

Hi - Sorry I assumed you were reversing the 50mm lens directly onto the body, if you are reversing it onto the front of the macro lens then leave the 50mm lens focused on infinity and the aperture wide open. Aperture and focus control is done using the main macro lens. Remember though the focus point will be fairly close to the front of the reversed lens.

Brian v.

Post #6, Apr 22, 2012 14:35:30


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RobinH
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I am thinking about the same setup - reversing a 50mm 1.4 on a 100mm 2.8.

So would the aperture on the reversed 1.4 have any effect? Since in normal use it is quite soft at 1.4, would setting the aperture to 2.8 make sharper pictures when reversed? Or do you just lose some light?

Post #7, Apr 22, 2012 15:07:31 as a reply to LordV's post 32 minutes earlier.


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Suddie1215
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Got it working now. I mistakenly assumed that reversing the 50mm would increase the minimum working distance so I was moving the lenses away from the subject but as you pointed out "Remember though the focus point will be fairly close to the front of the reversed lens." Once I made the adjustment it works fine and I can now achieve 3:1 magnification. Thanks again for all your help, now I only have to find interesting things to shoot.

LordV wrote in post #14309058external link
Hi - Sorry I assumed you were reversing the 50mm lens directly onto the body, if you are reversing it onto the front of the macro lens then leave the 50mm lens focused on infinity and the aperture wide open. Aperture and focus control is done using the main macro lens. Remember though the focus point will be fairly close to the front of the reversed lens.

Brian v.

Post #8, Apr 22, 2012 15:14:45




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LordV
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RobinH wrote in post #14309201external link
I am thinking about the same setup - reversing a 50mm 1.4 on a 100mm 2.8.

So would the aperture on the reversed 1.4 have any effect? Since in normal use it is quite soft at 1.4, would setting the aperture to 2.8 make sharper pictures when reversed? Or do you just lose some light?

Really not sure, I suspect you will have to suck it and see- starting off with it wide open and then perhaps trying a few set apertures down to say F2.8.
Brian v.

Post #9, Apr 23, 2012 01:08:06


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Canon 600D, 40D, 5D mk2, 7D, Tamron 90mm macro, Canon MPE-65,18-55 kit lens X2, canon 200mm F2.8 L, Tamron 28-70mm xrdi, Other assorted bits

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adamsheehy
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RobinH wrote in post #14309201external link
I am thinking about the same setup - reversing a 50mm 1.4 on a 100mm 2.8.

So would the aperture on the reversed 1.4 have any effect? Since in normal use it is quite soft at 1.4, would setting the aperture to 2.8 make sharper pictures when reversed? Or do you just lose some light?

It will have an effect, but it's always been negligible compared to the trade off for me. The aperture on the 50mm will be constant when shooting, so you'll lose a ton of light that is typically much needed to even find the subject at times.

Suddie1215 wrote in post #14309222external link
Once I made the adjustment it works fine and I can now achieve 3:1 magnification.

I could be wrong, but I think it's a 2:1 magnification with a 50mm stacked on a 100mm.

Post #10, Apr 23, 2012 11:33:20


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