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02/27/2009 11:44:49 AM · #1 |
Hey all,
Have a new problem. I've been using a Canon EF 70-300mm + Canon EF 50mm (reversed) for doing macro photography for several years now. However, I've recently picked up the 5D Mark II, and I'm getting serious vignetting because of the full-frame sensor.
What is the solution here, use a shorter focal length on the primary lens? Use a longer focal length on the reversed lens? Example here: flickr
note, this was the least vignetting I could achieve by adjusting the aperture on both lenses, as well as the focal length of the 70-300mm.
Cheers.
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02/27/2009 11:51:28 AM · #2 |
I wish I knew the answer. This one is with a Nikon 18-135 + reversed 50mm 1.8.
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02/27/2009 12:02:19 PM · #3 |
Originally posted by cynthiann:
I wish I knew the answer. This one is with a Nikon 18-135 + reversed 50mm 1.8. |
hmm, well there are a lot of kick-ass macro photographers on this site, i'm hoping one of them atleast has some experience with this...
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02/27/2009 12:11:32 PM · #4 |
can you compare at wide vs long on your zooms ?
my guess is that once you get less 50 it will vignette ..
Message edited by author 2009-02-27 12:11:46. |
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02/27/2009 12:17:15 PM · #5 |
| I'm most certainly a noob when it comes to this stuff, but I would think the aperture on the 50mm controls the vignette. I would assume then that if you made the aperture physically wider, such as a longer, fast lens, set wide open, maybe an 85 prime then you could limit the vignetting. |
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02/27/2009 12:18:41 PM · #6 |
Originally posted by ralph:
can you compare at wide vs long on your zooms ?
my guess is that once you get less 50 it will vignette .. |
i can post when i get home. but as i mentioned, this was the least vignetting i could achieve on the 70-300 mm range. i suppose i need something wider.
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02/27/2009 12:19:23 PM · #7 |
Originally posted by Five_Seat:
I'm most certainly a noob when it comes to this stuff, but I would think the aperture on the 50mm controls the vignette. I would assume then that if you made the aperture physically wider, such as a longer, fast lens, set wide open, maybe an 85 prime then you could limit the vignetting. |
hmm ok. can possibly try it out with my 85mm lens, but i'll have to check the thread size matches, since i only have two coupling rings.
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02/27/2009 12:26:05 PM · #8 |
| I can tell you that I don't get vignetting on FF using the 50/1.4 reversed on the Canon 100/2.8 macro. So the focal length of the normally-mounted lens is not the issue. The aperture on the reverse-mounted 50mm may well be part of the issue, and/or the distance between the two optical systems. Does the 70-300 have a deeply inset front element? If so, it's possible that the 50mm is just physically too far away from the front element, and thus vignettes on FF. |
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02/27/2009 12:33:58 PM · #9 |
in my case its
 at 18mm, and
at 135 mm.
Weird. Mayhaps it is the distance between the two optical systems.
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02/27/2009 12:37:57 PM · #10 |
Originally posted by kirbic:
I can tell you that I don't get vignetting on FF using the 50/1.4 reversed on the Canon 100/2.8 macro. So the focal length of the normally-mounted lens is not the issue. The aperture on the reverse-mounted 50mm may well be part of the issue, and/or the distance between the two optical systems. Does the 70-300 have a deeply inset front element? If so, it's possible that the 50mm is just physically too far away from the front element, and thus vignettes on FF. |
i've adjusted the aperture on the reversed 50mm from 1.8 all the way to 22 (by using the lens dismount technique). i suppose there's little i can do if the front element of the 70-300 is set too deep. i don't remember offhand, but will have a closer look when i get home.
thanks for that, though.
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02/27/2009 12:39:42 PM · #11 |
| You definitely want to keep the aperture on the reverse-mounted lens wide open, and control aperture with the normally-mounted lens. |
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02/27/2009 01:59:56 PM · #12 |
Originally posted by kirbic:
I can tell you that I don't get vignetting on FF using the 50/1.4 reversed on the Canon 100/2.8 macro. ... |
I didn't know that you could do such a thing! What kind of adapter do you need to reverse mount a lens on another lens... and where do you get them... and are the results any good??
Is there such a thing as a "reversal ring" adaptor to reverse mount a lens directly to an EF camera like the 5D? It would have to be something like an M42 adaptor allowing old pentax screw type lenses to be mounted to an EF camera. |
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02/27/2009 02:18:00 PM · #13 |
Originally posted by Artifacts:
Originally posted by kirbic:
I can tell you that I don't get vignetting on FF using the 50/1.4 reversed on the Canon 100/2.8 macro. ... |
I didn't know that you could do such a thing! What kind of adapter do you need to reverse mount a lens on another lens... and where do you get them... and are the results any good?? |
Coupling ring at Adorama
Results can be fantastic, have a look at previous Macro challenges. I think many of the top-placing shots were taken using this technique.
for example:
Message edited by author 2009-02-27 14:19:21.
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02/27/2009 02:49:12 PM · #14 |
Originally posted by Artifacts:
Originally posted by kirbic:
I can tell you that I don't get vignetting on FF using the 50/1.4 reversed on the Canon 100/2.8 macro. ... |
I didn't know that you could do such a thing! What kind of adapter do you need to reverse mount a lens on another lens... and where do you get them... and are the results any good??
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Packing tape or gaffer tape works well, at a pinch.
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02/28/2009 03:53:39 PM · #15 |
Yep, all that's needed is a very simple ring with double male threads of the correct diameters. For the 50/1.4 and 100/2.8 Macro, a 58mm to 58mm is what's needed, for instance.
You *can* simply reverse a short-focal-length lens with no normal lens, and even retain aperture control...Novoflex Adapter but at a high cost. A non-electronic adapter could be made using a body cap and some ingenuity ;-) |
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