Luminous Landscape Forum
Equipment & Techniques => Medium Format / Film / Digital Backs – and Large Sensor Photography => Topic started by: fredjeang on June 14, 2011, 02:31:13 pm
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I didn't know where to put this thread,
Is there a term in english for a lens aperture mount that is continuous, I mean that does not have any clicks between each aperture value but just a continuous movement exactly like the focus ring ?
Thanks.
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I can't recall seeing any specific terms; it's usually just described if necessary. For example, here's a quote from one writeup making that distinction:
“Most old cameras had an aperture scale graduated in full stops but the aperture is continuously variable allowing selection of any intermediate aperture. Click-stopped aperture became a common feature in the 1960s; the aperture scale was usually marked in full stops, but many lenses had a click between two marks, allowing a gradation of one half of a stop.”
(Quoted from here (http://en.wikipedia.org/wiki/F-number#Fractional_stops).)
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Sliding Aperture!
Most copal shutters can be switched to sliding aperture or click aperture. My Prontor shutters also had a switch to change the setting.
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I've seen the term 'continuous aperture'.
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You would say that the aperture is "continuously variable". That's a term that is applied in engineering to a number of things, including transmissions and potentiometers. It should be immediately understandable to English speakers.
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I understand "No detents". Does that mean too that the device is "infinitely variable"?
Eduardo
You would say that the aperture is "continuously variable". That's a term that is applied in engineering to a number of things, including transmissions and potentiometers. It should be immediately understandable to English speakers.
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Stepless
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Yes I also seen stepless.
English is a wonderfull language with so many ways to express a same idea as it appears here.
Thanks for all your imputs.
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I've also seen "continuos aperture" more than the other phrases here (all of which of course would mean the same thing, but I believe are in less common usage).
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As well as the above terms, in the video world, I've often seen it referred to as 'de-clicking the iris'. There are a few specialist companies who mod still lenses for video use. i.e. http://www.ducloslenses.com/Duclos_Lenses/Cinemod.html
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You would say that the aperture is "continuously variable". That's a term that is applied in engineering to a number of things, including transmissions and potentiometers. It should be immediately understandable to English speakers.
Luke has it.