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05/12/2004 11:51:55 AM · #1 |
this term shows up a lot in the post-processing comments : USM
can someone enlighten me about this term ?
thanks in advance |
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05/12/2004 11:52:54 AM · #2 |
| usm = unsharp mask (it's what photoshop calls thier sharpening tool) |
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05/12/2004 11:53:35 AM · #3 |
| Unsharp mask. It is used to sharpen an image. |
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05/12/2004 11:56:56 AM · #4 |
Originally posted by hopper:
usm = unsharp mask (it's what photoshop calls thier sharpening tool) |
Actually, the term goes back to the darkroom when you would make a blurred copy of the original photo and an "unsharp" version to use as a mask to create a new photo whose edges appeared sharper. Or so I've been told since I've never been in a darkroom... |
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05/12/2004 07:24:15 PM · #5 |
thanks guys....
so many things to learn .... was confusing it with a lens term. |
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05/12/2004 07:26:09 PM · #6 |
(Canon) Ultrasonic motor. Canon’s name for their ultrasonic lens motor system.
Ultrasonic motors work through the principle of motion induced by very high-frequency vibration. USM lenses are thus very fast-focussing lenses and nearly silent (to human ears, anyway) in operation.
Ring USM lenses (lenses with USM motors in a ring configuration around the barrel) do not use gears and so FTM (full-time manual) focussing is possible. Cheaper micromotor USM lenses, however, use gears and usually do not support FTM. Non-L lenses with USM motors are identifiable by the striped gold ring printed around the end of the lens barrel.
Nikon’s equivalent is their Silent Wave or AF-S series of lenses. - //photonotes.org/dictionary/
Message edited by author 2004-05-12 19:26:53. |
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05/12/2004 07:34:23 PM · #7 |
Originally posted by faidoi:
(Canon) Ultrasonic motor. Canon’s name for their ultrasonic lens motor system.
Ultrasonic motors work through the principle of motion induced by very high-frequency vibration. USM lenses are thus very fast-focussing lenses and nearly silent (to human ears, anyway) in operation.
Ring USM lenses (lenses with USM motors in a ring configuration around the barrel) do not use gears and so FTM (full-time manual) focussing is possible. Cheaper micromotor USM lenses, however, use gears and usually do not support FTM. Non-L lenses with USM motors are identifiable by the striped gold ring printed around the end of the lens barrel.
Nikon’s equivalent is their Silent Wave or AF-S series of lenses. - //photonotes.org/dictionary/ |
Given that he saw the term USM in a reference to post processing it is safe to assume that it is unsharp mask and not Ultrasonic motor. |
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05/12/2004 07:41:12 PM · #8 |
Originally posted by EddyG:
Originally posted by hopper:
usm = unsharp mask (it's what photoshop calls thier sharpening tool) |
Actually, the term goes back to the darkroom when you would make a blurred copy of the original photo and an "unsharp" version to use as a mask to create a new photo whose edges appeared sharper. Or so I've been told since I've never been in a darkroom... |
Never been in a dark room, what is the world coming to? It would be interesting to know just how many of us have ever been in a dark room. The last time I was in one was around 1972. |
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05/12/2004 08:08:05 PM · #9 |
| I recently completed Photography I and in that class I was lucky enough to have the opportunity to spend MANY hours in a darkroom. If you guys have never taken a photography class, I highly recommend it. Even though I want to persue the digital aspect of photography, learning the roots was awesome and well worth the effort! Anyone who's been down the "Process your own film" route, can appreciate the effortless prints digital has to offer. |
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