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#1
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What Is the Name For "Perspective" in Digital Photography?
Hello. I'm going to change my screen name to AsTheCameraTurns. I
bought a Canon PowerShot A620 two weeks ago, took it back after you guys told me it was no good for depth of field, bought a Kodak Z650, took that back because it got bad reviews from DPREVIEW, then finally ('cause Adorama, NYC, was offering the Canon PowerShot for $50 less than I paid in my superstore) bought the Canon PowerShot A620 again. Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. Well, I tried taking some photos "manually." The PowerShot just WILL NOT SHOOT when it decides it doesn't want to, which I suppose means when it decides the moron manning it has the dt's. So I set it on our deck rail and just shot randomly at a very baroque evening forest. VERY high contrast between the bright setting sun and the green leaves. Well, the depth of field in some pictures it decided to take is good, particularly if there's some large object in the frame (like a tree trunk); but the depth of field (or what *I* call depth of field) in far-off leaves is very flat. So is this what you guys meant when you said a 4X optical zoom wouldn't give me good focal length? |
#2
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What Is the Name For "Perspective" in Digital Photography?
In article .com,
"Jules Vide" wrote: Hello. I'm going to change my screen name to AsTheCameraTurns. I bought a Canon PowerShot A620 two weeks ago, took it back after you guys told me it was no good for depth of field, bought a Kodak Z650, took that back because it got bad reviews from DPREVIEW, then finally ('cause Adorama, NYC, was offering the Canon PowerShot for $50 less than I paid in my superstore) bought the Canon PowerShot A620 again. Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. Well, I tried taking some photos "manually." The PowerShot just WILL NOT SHOOT when it decides it doesn't want to, which I suppose means when it decides the moron manning it has the dt's. So I set it on our deck rail and just shot randomly at a very baroque evening forest. VERY high contrast between the bright setting sun and the green leaves. Well, the depth of field in some pictures it decided to take is good, particularly if there's some large object in the frame (like a tree trunk); but the depth of field (or what *I* call depth of field) in far-off leaves is very flat. So is this what you guys meant when you said a 4X optical zoom wouldn't give me good focal length? Have you actually read the manual? |
#3
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What Is the Name For "Perspective" in Digital Photography?
Jules Vide wrote:
What Is the Name For "Perspective" in Digital Photography? It's still called perspective. Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. Ever try and use a tripod on horseback? On a small boat? In a museum that bans tripods? In a park in Paris without a permit? (you'll be called a professional and you must get a permit) From an airplane? So your hiking down a trail, turn a corner and a bear is there in the middle of the trail. Do you: 1) Take you pack off, set the pack down, and lean over to get out your tripod, mount the camera and take the picture as the bear charges at you after you bent over? 2) Take a quick snapshot with your image stabilized camera that was hanging around your neck while you are slowly backing up? 2A) Take a flash picture as the bear is about to pounce on you so people will know how you died. The bear gets startled by the flash and runs off (true story reported in Popular Photography a few years ago). 3) Fall to a fetal position, play dead and hope? (hint: if it is a black bear, this one might get you killed.) ;-) Roger |
#4
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What Is the Name For "Perspective" in Digital Photography?
Jules Vide wrote:
Hello. I'm going to change my screen name to AsTheCameraTurns. I bought a Canon PowerShot A620 two weeks ago, took it back after you guys told me it was no good for depth of field, bought a Kodak Z650, took that back because it got bad reviews from DPREVIEW, then finally ('cause Adorama, NYC, was offering the Canon PowerShot for $50 less than I paid in my superstore) bought the Canon PowerShot A620 again. Uh, no point and shoot is "good for depth of field" or all point-and-shoots are "good for depth of field" depending on whether you want a little of it or a lot of it. Changing brands unless you go to a superzoom which at long focal length and short range gives you a reasonably low depth of field and gives the same high one as other point and shoots under other conditions isn't going to make much difference. Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. That's good advice for stationary subjects, but it's kind of hard to use a tripod to track a basketball game. IS works. It's not a substitute for a tripod, but it does work. Well, I tried taking some photos "manually." The PowerShot just WILL NOT SHOOT when it decides it doesn't want to, which I suppose means when it decides the moron manning it has the dt's. If it has no IS then it has no way of knowing that it's moving. More likely it isn't getting focus lock. So I set it on our deck rail and just shot randomly at a very baroque evening forest. VERY high contrast between the bright setting sun and the green leaves. Well, the depth of field in some pictures it decided to take is good, particularly if there's some large object in the frame (like a tree trunk); but the depth of field (or what *I* call depth of field) in far-off leaves is very flat. So is this what you guys meant when you said a 4X optical zoom wouldn't give me good focal length? Depth of field isn't "flat" or "not flat". If everything from close to the camera on out is sharp then you have wide depth of field, if everything at a certain distance is sharp but things slightly closer or slightly farther away are not then you have a narrow depth of field. -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#5
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What Is the Name For "Perspective" in Digital Photography?
On 13 Jul 2006 16:19:04 -0700, Jules Vide wrote:
Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. http://home.uchicago.edu/~dmsilev/dart_stab.jpg http://home.uchicago.edu/~dmsilev/dart_normal.jpg Two shots, taken in the same way except that the first had the stabilizer turned on, and the second had the stabilizer off. The difference in sharpness is pretty clear. The stabilizer means that you can take pictures at slower shutter speeds without needing a tripod. Of course, they have their limmits; a 1 second shot will certainly need a tripod. Picture info: 432 mm equivalent, 1/15s, f/3.3, no flash. The posted images are 100% crops from the original. Panasonic FZ5, using stabilizer Mode 2 for the first image, stabilizer off for the second. -dms |
#6
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What Is the Name For "Perspective" in Digital Photography?
Jules Vide wrote:
Hello. I'm going to change my screen name to AsTheCameraTurns. I bought a Canon PowerShot A620 two weeks ago, took it back .. bought a Kodak Z650, took that back bought the Canon PowerShot A620 again. I vote this one as our weekly troll. -- Joseph Meehan Dia duit |
#7
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What Is the Name For "Perspective" in Digital Photography?
David J. Littleboy wrote:
"J. Clarke" wrote: Uh, no point and shoot is "good for depth of field" or all point-and-shoots are "good for depth of field" depending on whether you want a little of it or a lot of it. It turns out that _for the same noise level and same pixel count_, there's absolutely no difference between a 6MP 4x5 sensor (with golf-ball-size pixels) and the tiniest 6MP dcam in the _maximum achievable DOF_. It turns out that diffraction (which limits how far you can stop down to increase the DOF) scales with sensor size, so that a larger format camera (for the same target resolution) can be stopped down much further without reducing sharpness. Furthermore, sensitivity scales in the same way, so while you need a much smaller aperture on the 4x5 camera, you get the same shutter speed at a far higher ISO (a higher ISO that gives the same signal to noise ratio as the P&S dcam). Of course, the minimum DOF is much smaller with larger format cameras. You _do_ like to argue from theory rather than practice, don't you. -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net) |
#8
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What Is the Name For "Perspective" in Digital Photography?
"J. Clarke" wrote in message ... David J. Littleboy wrote: "J. Clarke" wrote: Uh, no point and shoot is "good for depth of field" or all point-and-shoots are "good for depth of field" depending on whether you want a little of it or a lot of it. It turns out that _for the same noise level and same pixel count_, there's absolutely no difference between a 6MP 4x5 sensor (with golf-ball-size pixels) and the tiniest 6MP dcam in the _maximum achievable DOF_. It turns out that diffraction (which limits how far you can stop down to increase the DOF) scales with sensor size, so that a larger format camera (for the same target resolution) can be stopped down much further without reducing sharpness. Furthermore, sensitivity scales in the same way, so while you need a much smaller aperture on the 4x5 camera, you get the same shutter speed at a far higher ISO (a higher ISO that gives the same signal to noise ratio as the P&S dcam). Of course, the minimum DOF is much smaller with larger format cameras. You _do_ like to argue from theory rather than practice, don't you. Yes, but this works in practice; f/16 on the 5D at ISO 800 will look very much like f/5.6 at ISO 100 on a P&S dcam in terms of both DOF and shutter speed. And current P&S dcams are seeing more damage from diffraction at f/5.6 than the 5D does at f/16. David J. Littleboy Tokyo, Japan |
#9
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What Is the Name For "Perspective" in Digital Photography?
Roger N. Clark (change username to rnclark) wrote:
Jules Vide wrote: What Is the Name For "Perspective" in Digital Photography? It's still called perspective. Obviously it has no kind of image stabilization, but my sister told me that our Dad, a M.F.A. grad, said once that all claims of image stabilization are fool's gold; use a tripod. Ever try and use a tripod on horseback? On a small boat? In a museum that bans tripods? In a park in Paris without a permit? (you'll be called a professional and you must get a permit) From an airplane? So your hiking down a trail, turn a corner and a bear is there in the middle of the trail. Do you: 1) Take you pack off, set the pack down, and lean over to get out your tripod, mount the camera and take the picture as the bear charges at you after you bent over? 2) Take a quick snapshot with your image stabilized camera that was hanging around your neck while you are slowly backing up? 2A) Take a flash picture as the bear is about to pounce on you so people will know how you died. The bear gets startled by the flash and runs off (true story reported in Popular Photography a few years ago). 3) Fall to a fetal position, play dead and hope? (hint: if it is a black bear, this one might get you killed.) ;-) Roger Number 3, without a doubt, probably because I fainted. In any case, your chances of survival aren't all that good. |
#10
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What Is the Name For "Perspective" in Digital Photography?
Ron Hunter wrote:
: Roger N. Clark (change username to rnclark) wrote: : : So your hiking down a trail, turn a corner and a bear is there : in the middle of the trail. Do you: : : 3) Fall to a fetal position, play dead and hope? : (hint: if it is a black bear, this one might get you killed.) : : ;-) Reminds me of the old joke my cousin (a former National Park Ranger) told me. How do you tell the difference between a black bear and a grizzly bear? Slap it and climb a tree. If it comes up after you, its a black bear. If it shakes you down, its a grizzly. To the prior point, counting on IS to completely replace a tripod is a bad idea. Just as bad is to count on a tripod to be as effective or useable in all situations as IS. Depending on the user and the types of photographs the photographer is looking to take, IS may be more useful to some people than others. Also it is one more "gadget" that may confuse those who are easily overwhelmed. And it could conceivably add to the "button press to image capture" delay that many find upsetting. That last will depend on how the IS is implemented. Having no direct evidence I can't say for sure. But if the IS is physically implemented after the auto focus, it COULD make the delay worse. IMHO. On the other hand, as mentioned (with tongue in cheek) above, in some situations IS is definately the best, or only, way to go. Randy ========== Randy Berbaum Champaign, IL |
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