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extension tubes and zoom lenses?


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#1 Richard Tuohy

Richard Tuohy
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Posted 21 November 2005 - 05:42 PM

I have a Kras 3 with a meoptor zoom lens and I was hoping to use some 42mm thread extension tubes for macro work. Can extension tubes be used with a zoom lens, or do I need to get a prime lens of some sort?
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#2 Dickson Sorensen

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Posted 21 November 2005 - 06:24 PM

I have a Kras 3 with a meoptor zoom lens and I was hoping to use some 42mm thread extension tubes for macro work. Can extension tubes be used with a zoom lens, or do I need to get a prime lens of some sort?


If a zoom lens in not at its proper depth (flange to film plane) it will change focus as you zoom. You can put an extension tube on a zoom but you will not be able to hold focus as you zoom. It does create an interesting effect however that I have seen used to rack from a macro view of tree branches to a person standing in the distance. Definately worth experimenting with.
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