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New to Digital
In using 35mm film, I appreciated the various manual overrides to automatic
settings, such as apperature, shutter speed, and focus. Now I am looking at digital cameras and I find the specs on these features not well explained. Is there such a thing as a 30-second time exposure in digital? Is the equivalent of shutter speed something that I can control manually? What about depth of field? Robert Scott Ypsilanti, Michigan |
#2
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New to Digital
Robert Scott wrote:
In using 35mm film, I appreciated the various manual overrides to automatic settings, such as apperature, shutter speed, and focus. Now I am looking at digital cameras and I find the specs on these features not well explained. Well, they work just the same way as on film cameras. In addition you can also change the ISO settings without swapping films. Is there such a thing as a 30-second time exposure in digital? Depends on the camera. High-end models have "B" (bulb), but the one drawback with digital cameras is sensor noise, which can become quite significant with long-time exposure. Is the equivalent of shutter speed something that I can control manually? What about depth of field? Again, depends on the camera model. Better cameras allow you to control all this and much more. Cheap consumer level "junk" typically does not. It's just the same as with film cameras: those point-and-shoot or one-time use throw-away film cameras you can buy in souvenir shops don't allow you to adjust shutter speed or control DOF, either. jue |
#3
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New to Digital
On Sun, 02 Sep 2007 11:33:47 GMT, ---@--- (Robert Scott) wrote:
In using 35mm film, I appreciated the various manual overrides to automatic settings, such as apperature, shutter speed, and focus. Now I am looking at digital cameras and I find the specs on these features not well explained. Is there such a thing as a 30-second time exposure in digital? Is the equivalent of shutter speed something that I can control manually? What about depth of field? Robert Scott Ypsilanti, Michigan Robert, The line-up of DSLR cameras operate like the film equivalent, with full manual control, aperature priority or shutter priority for depth of field, motion control, etc., or full automatic shooting. An advantage is that DSLR's allow you to change ISO settings, allowing you to shoot under a wider variety of conditions than you can with a film camera without changing film. The "point and shoot" variety don't generally offer as much manual control as the DSLR cameras, but the higher end ones come close or may even match the functionality. Check out: dpreview.com and stevesdigicams.com for some pretty good information. HTH Bill |
#4
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New to Digital
---@--- (Robert Scott) writes:
In using 35mm film, I appreciated the various manual overrides to automatic settings, such as apperature, shutter speed, and focus. You find these on digital SLRs (DSLRs) and (higher end) digicams as well. The Canon Powershot G9 is an example: http://www.dpreview.com/news/0708/07082005canong9.asp Now I am looking at digital cameras and I find the specs on these features not well explained. Is there such a thing as a 30-second time exposure in digital? Most DSLRs have "bulb", but noise become an issue with longer exposures (but there are ways to deal with this), Is the equivalent of shutter speed something that I can control manually? Yes, and higher end models even use the same type of mechanical shutter used in film cameras. What about depth of field? That depends on sensor size. A camera with an FX-size or film-sized senor (e.g. Nikon D3, Canon 5D, will give you the same DOF as 135-format film. A DX-sized sized sensor (e.g Nikon D40) will give about 1/2 stop more DOF at the same FOV and aperture For instance, if use use a 50 mm lens at f/2.0 at a film camera, and then move that lens to a camera with a DX-sized sesnor and set aperture to f/2.0, the result will as if we've used a 75 mm lens at f/3.0 at the film camera in terms of FOV and DOF. But not in terms of speed, the f-stop would still be f/2.0. Digicams have tiny sensors, and you will have problems getting shallow DOF on them. For more about how sensor sizes affect images, see: http://hannemyr.com/photo/crop.html http://hannemyr.com/photo/crop2.html -- - gisle hannemyr [ gisle{at}hannemyr.no - http://hannemyr.com/photo/ ] ------------------------------------------------------------------------ Sigma SD10, Kodak DCS 14n, Canon Powershot G5, Olympus 2020Z ------------------------------------------------------------------------ |
#5
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New to Digital
Gisle Hannemyr wrote:
---@--- (Robert Scott) writes: In using 35mm film, I appreciated the various manual overrides to automatic settings, such as apperature, shutter speed, and focus. You find these on digital SLRs (DSLRs) and (higher end) digicams as well. The Canon Powershot G9 is an example: http://www.dpreview.com/news/0708/07082005canong9.asp Now I am looking at digital cameras and I find the specs on these features not well explained. Is there such a thing as a 30-second time exposure in digital? Most DSLRs have "bulb", but noise become an issue with longer exposures (but there are ways to deal with this), While noise certainly can't be ignored, new concepts in processing not only reduce the noise problem, the fact that digital cameras have higher quantum efficiency than film and no reciprocity failure means that digital cameras can record much fainter subjects than film. Digital cameras have become the choice for astrophotography, for example. The key is to take shorter exposures and digitally add them, and noise gets averaged away. See (Gisle, I know you know this; this is for the OP): http://www.clarkvision.com/photoinfo...ht.photography Is the equivalent of shutter speed something that I can control manually? Yes, and higher end models even use the same type of mechanical shutter used in film cameras. What about depth of field? That depends on sensor size. A camera with an FX-size or film-sized senor (e.g. Nikon D3, Canon 5D, will give you the same DOF as 135-format film. A DX-sized sized sensor (e.g Nikon D40) will give about 1/2 stop more DOF at the same FOV and aperture For instance, if use use a 50 mm lens at f/2.0 at a film camera, and then move that lens to a camera with a DX-sized sesnor and set aperture to f/2.0, the result will as if we've used a 75 mm lens at f/3.0 at the film camera in terms of FOV and DOF. But not in terms of speed, the f-stop would still be f/2.0. Digicams have tiny sensors, and you will have problems getting shallow DOF on them. For more about how sensor sizes affect images, see: http://hannemyr.com/photo/crop.html http://hannemyr.com/photo/crop2.html Gisle, These are excellent pages with a lot of great information. But the DOF sections are classical views that don't fully incorporate the properties of digital cameras with varying pixels and their differing light gathering abilities. See: The Depth-of-Field Myth and Digital Cameras http://www.clarkvision.com/photoinfo/dof_myth Other articles that the OP may find of interest: http://www.clarkvision.com/imagedetail Roger |
#6
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New to Digital
On Sep 2, 5:38 pm, Gisle Hannemyr wrote:
---@--- (Robert Scott) writes: Now I am looking at digital cameras and I find the specs on these features not well explained. Is there such a thing as a 30-second time exposure in digital? Most DSLRs have "bulb", but noise become an issue with longer exposures (but there are ways to deal with this), That there is noise buildup with longer exposures is true; to put it into perspective, however, here's a 4 minute ISO 800 shot with a D200: http://www.pbase.com/al599/image/84895056 This 's the camera jpeg, so it did its own noise reduction (it's not hard to see it). The only thing I did to it is compress it a bit to save space, so eg the white balance is off. Frankly, I think the long exposure noise issue is irrelevant except for astrophotographers. Certainly it's a non-issue in comparison to what happens with ISO 800 films when exposed for 4 minutes... |
#7
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New to Digital
"Roger N. Clark (change username to rnclark)" writes:
Gisle Hannemyr wrote: For more about how sensor sizes affect images, see: http://hannemyr.com/photo/crop.html http://hannemyr.com/photo/crop2.html Gisle, These are excellent pages with a lot of great information. But the DOF sections are classical views that don't fully incorporate the properties of digital cameras with varying pixels and their differing light gathering abilities. See: The Depth-of-Field Myth and Digital Cameras http://www.clarkvision.com/photoinfo/dof_myth Ok, I've updated DOF-section of my cropping page somewhat and included a brief summery of your point (I hope, please let me know if you think the summary are inaccurate), and also included a link to your "myth" article. OK? Anchor to the revised section: http://hannemyr.com/photo/crop.html#dof -- - gisle hannemyr [ gisle{at}hannemyr.no - http://hannemyr.com/photo/ ] ------------------------------------------------------------------------ Sigma SD10, Kodak DCS 14n, Canon Powershot G5, Olympus 2020Z ------------------------------------------------------------------------ |
#8
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New to Digital
Roger N. Clark (change username to rnclark) wrote:
While noise certainly can't be ignored, new concepts in processing not only reduce the noise problem, the fact that digital cameras have higher quantum efficiency than film and no reciprocity failure means that digital cameras can record much fainter subjects than film. Digital cameras have become the choice for astrophotography, for example. The key is to take shorter exposures and digitally add them, and noise gets averaged away. See (Gisle, I know you know this; this is for the OP): In astrophotography, the sensors are cooled to allow long exposures with little noise buildup. It isn't practical in a digicam. In film photography, high-ISO films are grainier. The noise in digital photography has a different cause, but the end product looks similar to the viewer. |
#9
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New to Digital
Marvin wrote:
Roger N. Clark (change username to rnclark) wrote: While noise certainly can't be ignored, new concepts in processing not only reduce the noise problem, the fact that digital cameras have higher quantum efficiency than film and no reciprocity failure means that digital cameras can record much fainter subjects than film. Digital cameras have become the choice for astrophotography, for example. The key is to take shorter exposures and digitally add them, and noise gets averaged away. See (Gisle, I know you know this; this is for the OP): In astrophotography, the sensors are cooled to allow long exposures with little noise buildup. It isn't practical in a digicam. Right, and I was referring to astrophotography with digital cameras. E.g. see: http://www.clarkvision.com/galleries...y.astrophoto-1 In film photography, high-ISO films are grainier. The noise in digital photography has a different cause, but the end product looks similar to the viewer. It is not just grain/noise; it it total sensitivity and no reciprocity failure that propel DSLRs cameras above film. Roger |
#10
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New to Digital
Gisle Hannemyr wrote:
"Roger N. Clark (change username to rnclark)" writes: Gisle Hannemyr wrote: For more about how sensor sizes affect images, see: http://hannemyr.com/photo/crop.html http://hannemyr.com/photo/crop2.html Gisle, These are excellent pages with a lot of great information. But the DOF sections are classical views that don't fully incorporate the properties of digital cameras with varying pixels and their differing light gathering abilities. See: The Depth-of-Field Myth and Digital Cameras http://www.clarkvision.com/photoinfo/dof_myth Ok, I've updated DOF-section of my cropping page somewhat and included a brief summery of your point (I hope, please let me know if you think the summary are inaccurate), and also included a link to your "myth" article. OK? Anchor to the revised section: http://hannemyr.com/photo/crop.html#dof OK. I'll ad a link to your page from mine. Thanks Roger |
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