Reversing 50mm?

gardenersassistant wrote:

3D Gunner wrote:

gardenersassistant wrote:

How does that work in practical terms? For example, suppose I want to reverse mount an FD lens on to an MFT body. If I put an FD to MFT adapter on the body it presents an FD mount to attach to. Do I then put an FD reverse adapter on to the FD to MFT adapter, and then attach the lens to the reverse adapter?

So, the solution is "reverse to adapter" (and it works very well).

What are the benefits of reversing to adapter rather than reversing to body? Sharper images? Less aberrations? More magnification? A greater range of magnification? With my two experiments the shorter focal length produced the greatest magnification, but changing the focus between infinity and nearest focus didn't change the magnification for one of them, and only changed it a small amount for the other one. Is that normal with lenses that are reversed to body? Do you get a better range of magnifications when reversing to adapter? (Unfortunately I only have the reversers needed for reverse to body and don't have the reversers needed to experiment with reverse to adapter, hence my questions.)

Lenses are made so they can focus as long as they are at the proper distance away from your camera's image sensor.

What is puzzling me here is the "as long as", which presumably means the lens can't focus if it isn't at the proper distance from the sensor. However, if your options 1 and 2 put the lens at the right distance from the sensor so it can focus, how is it that the reverse to body option I used also allows the lens to focus, with it being at the wrong distance from the sensor? I used

3. m4/3 body + reverse ring + reverted lens

which puts the reverted lens closer to the sensor than your options 1 and 2.

So, an m4/3 to Pentax adapter will give you functionality of Pentax lenses on both directions, normal or inverted.
"Inverted to body" may give you a too short distance to sensor, depending on physical lens construction.
But you can use an adapter for "Inverted to body" option plus some extenders.
1. - m4/3 body + Lens adapter + reverse ring + reverted lens
2. - m4/3 body + reverse ring for desired diameter + extension rings with same diameter + reverted lens. Extension rings have the same effect as some short macro tubes.

By example, You can use a Macro Reverse Mount Adapter m4/3 to 52mm, and 52mm to any other diameter adapters plus extension rings, to use a lot of inverted lenses made any brand.

I think the simple logic is to reproduce the register distance of the original body for the lens.

I want the same effect as reversing the lens on a K-mount body, so I need to the m4/3 to PK adapter. When  I reverse mount the 50mm, I expect 1:1.