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Changing the focus distance of a lens.

Started May 2, 2015 | Questions thread
diy_lens Contributing Member • Posts: 668
Re: Changing the focus distance of a lens.

tekhiun wrote:

So I looked into some DYI macro setups, and stumbled upon a guide that said I could use the front element of an old lens mounted via a reverse ring on my kit lens. This works quite well, but what really intrigued me is that even with the lens focused at infinite, the actual focus distance is a few centimenters from the lens. This got me wondering if there is a way to reverse mount an element on my lens and make the lens focus on a few meters away from the lens when focused to infinity and how would this affect other aspects of the image such as DOF.

Has anyone had any experience with this before ? I tried searching the web but I got no results besides the DYI macro setup.

I think this is what you were more or less looking for:

http://www.nephotographyguild.com/?s=Stacked+Lenses+

http://photo.net/bboard/q-and-a-fetch-msg?topic_id=23&msg_id=000aUN&start=10

http://macro-photography.org/what_does_stacking_lenses_mean/index.php

DOF and working distance are going to depend on the lenses used. If you had a cheap 70-200 zoom, you could try that, find the sweet spot that you like. Take not of the focal length and then buy a matching prime. But, read the photo.net post by Bjorn as he details, specifically, how to get the best IQ and useability for a stacked setup.

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