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Prime lenses vs Zoom lenses


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#1 Eugene Lehnert

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Posted 28 July 2005 - 03:31 PM

I have a Switar zoom lens for my Bolex. The minimum focus distance that I have is about 5 ft. If I were to use a prime lens of a long lens say a 75mm focal length would the minimum focus distance be less than the zoom set to 75mm? Or is the minimum focal distance merely affected by focal length?
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#2 Chris Keth

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Posted 28 July 2005 - 07:08 PM

I have a Switar zoom lens for my Bolex.  The minimum focus distance that I have is about 5 ft.  If I were to use a prime lens of a long lens say a 75mm focal length would the minimum focus distance be less than the zoom set to 75mm?  Or is the minimum focal distance merely affected by focal length?

<{POST_SNAPBACK}>




Tricky question. The answer is: maybe. In the manufacture of zoom lenses, generally, something has to be compromised: usually speed or minimum focus distance. So, depending on the lens, it might focus closer, it might not. It really depends on the actual lens you're looking at.
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#3 Steven Budden

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Posted 28 July 2005 - 10:01 PM

I have a switar preset macro 75mm that focuses down to about 2 feet, and this is probably enough... for instance, a few computer keyboard keys could fill a whole screen!

Steven
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#4 Eugene Lehnert

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Posted 29 July 2005 - 08:30 AM

Ok, thanks. So the answer looks to be most likely. Thanks!
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