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Reversing 50mm?

Started Feb 12, 2022 | Questions thread
gardenersassistant Veteran Member • Posts: 9,656
Re: Reversing 50mm?

BBbuilder467 wrote:

Just for curiosity, I'd like to reverse a Pentax 50mm SMC-M, all manual lens to my micro 4/3.

I can't remember if I need to reverse directly to the body or reverse to the adapter to get the 1:1 magnification.

Has anyone tried it? With extension tubes, I need to use the adapter to get accurate ratios, so I assume I need to reverse to the adapter. I'd need the reverse mount for Pentax K instead of m4/3?

Not sure if the discussion has clearly answered this, so please ignore this if it has.

You could use an M43 to PK adapter and then a PK reverse ring on the PK side. To get extra distance to the lens you could then use M43 extension tubes on the m43 side of the adapter or PK extension tubes on the PK side.

Alternatively you could use an M43 reverse ring without using the PK adapter. You would be limited to using M43 extension tubes to get extra distance to the lens.

I did some measurements with a reversed Minolta 35-70 this morning. I used an M43 reverse ring, with and without M43 extension tubes. And I used an M43 to EF adapter, with and without EF extension tubes and an EF teleconverter on the EF side of the adapter. It turns out that this sort of setup can give a good range of magnifications without having to adjust the setup by changing extension tubes etc.

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