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DPChallenge Forums >> Hardware and Software >> Dodgy macro lenses
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 10/28/2003 07:51:29 PM · #1
Does anyone have any experiences using one of these Novoflex reverse lens adaptors??
Novoflex adaptor for Canon EOS

Message edited by author 2003-10-28 19:52:00.
 10/28/2003 09:53:10 PM · #2
I don't have direct experience with it, but I've seen reference to it before. The piece that goes between the camera and lens must have some optical element(s); normally you mount a lens reversed on the front of another lens. The price is darn high for what's essentially a mechanical/electrical adapter. You still need a good lens to reverse.
I took the approach of buying the 100mm/F2.8 macro lens, an extension tube, and a 2x converter. I can reach about 2.2x, which is plenty enough for me, and the 2.0X converter is useful for other things...
If one wants to reverse for really high magnification, I'd just buy a coupler ring. The reversed lens stays at full aperture, which is what you want. You control aperture through your main lens. The reversed lens stays at infinity focus, your main lens controls focus. You will likely not have good (any?) Auto-focus, but at high magnifications, it is of little or no value anyhow.
 10/28/2003 11:15:27 PM · #3
No optics involved in most lens reversing adaptors. When a lens is reversed it will focus much closer and the reversing adaptor works like an extention tube. Resulting in a lens becoming a powerful macro tool. Maybe someone with an optics background and can explain this better.
 10/28/2003 11:27:11 PM · #4
Originally posted by jimsapp:
No optics involved in most lens reversing adaptors. When a lens is reversed it will focus much closer and the reversing adaptor works like an extention tube. Resulting in a lens becoming a powerful macro tool. Maybe someone with an optics background and can explain this better.


Jim,
You are correct, it does work without further optics. I tried just manually holding it there and voila. So the Novoflex adapter would then just provide the reverse (mechanical) mount and carry through the elecrical connections to the back (now front) of the lens. I'm simply amazed at what they're charging for it; you could almost buy a 100/2.8 macro lens.

10/28/2003 11:29:50 PM · #5
If you want to try some "extreme close-up" photography for cheap and already have a macro lens and something like a 50mm lens, you can get a macro coupler (which Kirbic mentioned in his reply) of the appropriate thread sizes to mount your 50mm lens "reversed" on the front of your macro lens.

Obviously this isn't the same thing as the Novoflex gizmo (which reverses a single lens while still allowing automatic operation of the aperture and focus mechanisms) but it does permit getting very close. In my experience with this technique, you subject-to-lens distance is extremely small (less than an inch or two) and your DOF is very, very shallow.

But you can get up close:
...

Message edited by author 2003-10-28 23:35:24.
 10/28/2003 11:42:45 PM · #6
Serious impesssive macro magnification. See what you mean about DOF.

I can only imagine what the whole thing looks like with both lenses *laugh*
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