Is it possible to get the same 2:1 magnification with a longer working distance?

Started 2 months ago | Questions thread
Michael Benveniste
Michael Benveniste Veteran Member • Posts: 5,197
Re: Is it possible to get the same 2:1 magnification with a longer working distance?

gardenersassistant wrote:

Michael Benveniste wrote:

With the gear I own, the first thing I’d try is a Sigma 100-400mm with a Marumi 200 DHG close up lens. That would yield 2x at a working distance of over 320mm, but I would expect to have to live with some optical compromises.

I'm curious about these numbers.

The Marumi 200 is +5 diopters and has a maximum working distance of around 200mm. Are you thinking of the +3 diopters Marumi 330 in terms of its around 330mm maximum working distance (which unlike the Marumi 200 at 400mm would of course not get to 2X magnification)?

You're right -- it looks like I used the wrong length for the base lens. Instead of relying on calculations, I just hung it on my copystand and measured 195mm.

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