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#11
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Mirror Lockup Necessary on Tripod?
Bob Salomon wrote:
In article , Stacey wrote: Bob Salomon wrote: I have regularly hand held the 6006 and 6008 at 1/15th and have prints up to 30x40" at this speed. But how many "good" ones would you get in a row? Hand holding always comes down to "rolling the dice", sometimes it's the only way to get the shot but it's always risky. No problem handholding the 6008 while doing auto bracketing at 1/15 to 1/30. Sure. It is no real problem to enlarge _any_ neg to 30x40". The question is how sharp it will be. Are you sure that you could see the difference between a Apo-Rodagon (old) and a Apo-Rodagon-N (latest version) with this 1/15s-handhold negs? Martin (SL66, MLU, 12kg Linhof tripod for anything slower than 1/250s...) |
#12
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Mirror Lockup Necessary on Tripod?
In article ,
Bob Salomon wrote: No problem handholding the 6008 while doing auto bracketing at 1/15 to 1/30. You must trip the shutter between heart beats. Seriously, I do digitial video and have some pretty steady young men who shoot for me as well. When handholding the camera w/o a steady, and as still as we can, using a long lens we can see camera movement, and under the best circumstances the subtle bounce is from the photographers _heartbeat_. Hard to get around that, but then we are all thin or muscular. Dunno how a proserously built person would do. |
#13
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Mirror Lockup Necessary on Tripod?
Mxsmanic wrote:
Mirror movement is most critical when the shutter speed is comparable to the duration of the movement. That is, if it takes 1/15 of a second for the mirror to move, a shutter speed of 1/15 of a second is particularly likely to show the blurring effects of mirror movement. Shorter exposures are so short that the mirror can't move very far and the blurring is minimal; longer exposures are so long that the brief period during which the mirror moves the camera doesn't have much effect on the total exposure. A speed of 1/15 second on many cameras is one of the most vulnerable, but it varies from one camera to another. If anything, the frequency and amplitude of the vibrations caused when the mirror hits the solid camera frame are what matter. Not (just) the mirror bounce. These vibrations depend on how the camera is put together, on the ratio of moving to inert masses, and how the camera's inert mass is distributed. It is correct that vibrations will have most effect at certain shutterspeeds. [...] I've heard some say that even a tripod doesn't help! A tripod does not help with mirror movement; you need to lock the mirror up before making the exposure. A tripod only minimizes external sources of camera motion, such as your trembling hands. A tripod can indeed worsen the effect of the vibrations caused by the mirror. The vibrations originating inside the camera are transfered to the tripod, which, when all moving parts are fastened tightly, will resonate. However, this resonation can be avoided, and a significant amount of dampening added, by leaving a little bit of play in the tripod head's fastenings, not tigthening them as fast as possible. Allowing the tripod head to move (and it will move only very, very little) will effectively absorb vibrations caused by the camera itself. |
#14
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Mirror Lockup Necessary on Tripod?
Q.G. de Bakker wrote:
However, this resonation can be avoided, and a significant amount of dampening added, by leaving a little bit of play in the tripod head's fastenings, not tigthening them as fast as possible. Allowing the tripod head to move (and it will move only very, very little) will effectively absorb vibrations caused by the camera itself. Wouldn't the cork used on some tripod mount plates help in this regard? I've seen "upgraded" plates that are all metal, might be a bad idea to do this? -- Stacey |
#15
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Mirror Lockup Necessary on Tripod?
Stacey wrote:
Wouldn't the cork used on some tripod mount plates help in this regard? I've seen "upgraded" plates that are all metal, might be a bad idea to do this? Perhaps a bit, yes. The camera is secured to the head by a very solid metal screw though. The cork is meant to provide friction, stopping the camera from sliding on the head, rotating around the screw with which it is fastened to the tripod head. When the camera starts vibrating (due to mirror slap), the screw will act as a pivoting point. A flexible material, like cork, pressing against the camera will help dampen these vibrations. |
#16
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Mirror Lockup Necessary on Tripod?
In article , "Q.G. de
Bakker" wrote: Stacey wrote: Wouldn't the cork used on some tripod mount plates help in this regard? I've seen "upgraded" plates that are all metal, might be a bad idea to do this? Perhaps a bit, yes. The camera is secured to the head by a very solid metal screw though. The cork is meant to provide friction, stopping the camera from sliding on the head, rotating around the screw with which it is fastened to the tripod head. When the camera starts vibrating (due to mirror slap), the screw will act as a pivoting point. A flexible material, like cork, pressing against the camera will help dampen these vibrations. This thread has been an interesting example of impressionistic keyboard engineering carried way, way too far. |
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