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#1
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Effects of Parallax ??
Hi,
Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Cheers Mal Oz |
#2
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Effects of Parallax ??
"Drac" wrote in message ... Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Absolutely definitely positively *not*. Are you stitching them together yourself, or using auto software? -- Jeff R. |
#3
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Effects of Parallax ??
Drac wrote:
Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Cheers Mal Oz First up, there are cheap ways to create a nodal-point thingy if you really must have one - Rusty, where was that blog of yours again? Second, it really depends on the scene - do you have a lot of stuff in the foreground? And is the stuff *behind* the foreground objects, complex or detailed? That may add up to give you, and your software, hell.. Having said that, in all but a very few panos I've done, software like PTGUI (+ Smartblend - I'm a recent convert!) has little trouble 'compromising'. There have been a couple of notable examples where I now *wished* I had done the nodal thing, though.. Examples available on demand. I would suggest that if it is 'typical' landscapes, then you are probably not going to get into trouble often, so the answer to your question is "Probably, maybe not" ... |
#4
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Effects of Parallax ??
Drac wrote:
Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Cheers Mal Oz Yes it can be - if you have close foreground objects and background objects in the frames, you may have problems stitching. If not using a pano head, then how close the foreground objects need to be to cause problems depends on lens f/l, and either how steady you can hand hold, or how far ahead of the tripod rotation point the lens entry pupil is. That said, many times you can get great results without worrying about a pano head. I made an L shaped bracket fairly simply, and have that mounted on an old pan and tilt head tripod with a level. Have mounted quick-release plates on it on both angles, so can easily change from portrait to landscape. If you can't be bothered making one, the Panosaurus (google for the website) looks good for the price - but not solid enough for long exposures. Calculating lens entry pupil accurately enough for panos is relatively simple. Note that entry pupil will shift as zoom lens focal length is adjusted. I just used two toothpicks lined up vertically at each end of a long table, adjusting distance on the bracket until there's no shift panning left to right. Works perfectly - marked the positions of the lenses I use on the bracket. Haven't bothered to use a pano head that rotates vertically around the entry pupil, as generally you'll have no foreground objects above the bottom row of a multi-row pano, so parallax isn't an issue. (I made a prototype that did this, but it was a bit cumbersome, and as I found, unnecessary for my needs. D70/80/200/300 cameras are pretty handy, as the gridlines in the viewfinder can be used to line up sufficient overlaps. |
#5
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Effects of Parallax ??
"Drac" wrote: Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? If there is stuff in the foreground, yes. For example if you are shooting with a very wide lens in a graveyard, and there are gravestones right up to the tripod, you'll want to swivel around the nodal point. If you are shooting the NY skyline from across the river with a telephoto, no. David J. Littleboy Tokyo, Japan |
#6
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Effects of Parallax ??
Drac wrote:
Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Only when the subject is "close". BugBear |
#7
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Effects of Parallax ??
bugbear wrote:
Drac wrote: Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? Only when the subject is "close". BugBear ... and even then, some software has an optiob to remove the "ghosts" which can occur. David |
#8
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Effects of Parallax ??
On Feb 12, 9:55*pm, "Drac" wrote:
Hi, Just getting into some simple single-plane pano's - mostly 180deg landscapes at the moment. Currently using a D80 on top of a tripod and levelling base.. Getting some results that I'm happy with (thus far). To do this right of course I've been advised that a proper pano-head is required to shift the nodal point of the lens over the tripod axis to remove the effects of parallax. Is the effect of parallax that much of an issue (visually) to go to the expense of acquiring the additional hardware ? For most landscape photos a pano head is not really needed. Shooting in cases where objects are close, like inside rooms, become hard with out one.You will know when you need one by whether you images stitch together well or not. Beyond rotating around the nodal point some pano-head will do indexing, which can make life easier, particularly when you get in to doing more then on raw, say a 5 x 10 pano. I shot panos for many years without a pano head, but it got a lot easier when I got a pano head. Scott |
#9
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Effects of Parallax ??
David J Taylor wrote:
bugbear wrote: BugBear .. and even then, some software has an optiob to remove the "ghosts" which can occur. David I think "remove" is overstating the case; ameliorate, perhaps? BugBear |
#10
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Effects of Parallax ??
bugbear wrote:
David J Taylor wrote: bugbear wrote: BugBear .. and even then, some software has an option to remove the "ghosts" which can occur. David I think "remove" is overstating the case; ameliorate, perhaps? BugBear Indeed - I'd accept "reduce". In practice, AutoPano Pro works well. Cheers, David |
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