ygelman
Loc: new -- North of Poughkeepsie!
PrairieSeasons wrote:
. . . .
You didn't ask how to eliminate the effect, but one possibility is to use a tilt-shift lens and another is to use the lens correction filter in PhotoShop.
The lens correction filter in Photoshop works fine if you know you're trying to correct a vertical edge. But a few weeks ago I tried correcting the Leaning Tower of Pisa -- and could not figure out how much to correct!
The original image (camera pointing up, of course) made the tower leaning IN, whereas it was actually leaning OUT. If I had been post processing on site it would been ok, but at home I could not get a clue since there was nothing vertical in the background near the tower.
Any ideas? Before and after images follow.
As shot.
It's falling!!
Thank you for your feedback. I appreciate it!! :)
Looks like there is more practice to be done! Thanks so much for the response. I appreciate it! :)
bkyser
Loc: Fly over country in Indiana
A wide angle lens is only going to make the problem appear worse. If you want a different lens, a tilt/shift lens is the only thing that will help for "in camera" fixing. Frankly, I'd just do it in post production. T/S lenses are very expensive, and after the innitial "playing with it" phase, you probably wouldn't use it much at all. Just my 2 cents.
bkyser wrote:
A wide angle lens is only going to make the problem appear worse. If you want a different lens, a tilt/shift lens is the only thing that will help for "in camera" fixing. Frankly, I'd just do it in post production. T/S lenses are very expensive, and after the innitial "playing with it" phase, you probably wouldn't use it much at all. Just my 2 cents.
You are absolutely correct about a wide angle lens. PP is the answer. The Lens Baby, a tilt shift lens, is not as expensive as others. I think I paid $200-$250 for mine.
Skswany wrote:
I took this photo of Notre Dame Cathedral a week ago when in Paris and was fairly close to the building. I shoot a Canon T3i with a Tamron 18-270 lens. The lens was set at 18mm, f/9, ISO100. The architecture is noticeably curved up on the left - which is not reality of course. When I stepped further away, the shot straightened out - well sort of (see shot #2). Just wondering what caused this. Is it a limitation with the lens at this short of a focal length? Advice and feedback appreciated!
I took this photo of Notre Dame Cathedral a week a... (
show quote)
If you're looking for the tool to eliminating the keystone effect at the time of the shoot ,a wide angle lens won't do .Wide w/tilt shift will. Simply put ; Camera on tripod , it's base parallel to the ground, lens looking to the front at your subject while you tilt the lens so that it encompasses all you wish to include while eliminating unwanted convergin parrales to the extent there be only the need to focus so as to include suitable d.o.f. . For fuller explanation ; I suggest you Google , "Scheimpflug Principle " Lens is costly .Available in several focal lengths .RENT before deciding .
mcveed
Loc: Kelowna, British Columbia (between trips)
If you're looking for the tool to eliminating the keystone effect at the time of the shoot ,a wide angle lens won't do .Wide w/tilt shift will. Simply put ; Camera on tripod , it's base parallel to the ground, lens looking to the front at your subject while you tilt the lens so that it encompasses all you wish to include while eliminating unwanted convergin parrales to the extent there be only the need to focus so as to include suitable d.o.f. . For fuller explanation ; I suggest you Google , "Scheimpflug Principle " Lens is costly .Available in several focal lengths .RENT before deciding .[/quote]
Tilting the lens will not correct for perspective distortion, shifting will.
Thank you thank you! I will check it out!
Chinaman
Loc: Adelaide, South Australia, Australia
One could use a standard lens, stand as far back as possible, shoot vertical overlaping shots to stitch in a photoeditor.
ygelman wrote:
PrairieSeasons wrote:
. . . .
You didn't ask how to eliminate the effect, but one possibility is to use a tilt-shift lens and another is to use the lens correction filter in PhotoShop.
The lens correction filter in Photoshop works fine if you know you're trying to correct a vertical edge. But a few weeks ago I tried correcting the Leaning Tower of Pisa -- and could not figure out how much to correct!
The original image (camera pointing up, of course) made the tower leaning IN, whereas it was actually leaning OUT. If I had been post processing on site it would been ok, but at home I could not get a clue since there was nothing vertical in the background near the tower.
Any ideas? Before and after images follow.
quote=PrairieSeasons . . . . br You didn't ask h... (
show quote)
You can do a pretty good job of it in Photoshops Lens Correction -
The key is that before you apply the keystoning correction, you have to get the center of the image straight. Look at the brick buildings in the background - the buildings are tilted to the left at the image's vertical center line. Once you have rotated the image clockwise to get those buildings straight up and down at the centerline, Use the Vertical Perspective control in the Transform section (under the Custom Tab) to straighten up the verticals in the building on the left (I am assuming that that building wasn't leaning). Now the tower will lean to the right approximately as it should be without looking like it is actually falling over! I might have been a little too conservative when rotating the image initially, so the tower might really be leaning to the right a little more!
Harry
Right Leaning Tower
Hal81
Loc: Bucks County, Pa.
ianhargraves1066 wrote:
Skswany wrote:
I took this photo of Notre Dame Cathedral a week ago when in Paris and was fairly close to the building. I shoot a Canon T3i with a Tamron 18-270 lens. The lens was set at 18mm, f/9, ISO100. The architecture is noticeably curved up on the left - which is not reality of course. When I stepped further away, the shot straightened out - well sort of (see shot #2). Just wondering what caused this. Is it a limitation with the lens at this short of a focal length? Advice and feedback appreciated!
I took this photo of Notre Dame Cathedral a week a... (
show quote)
Having always been involved in photographing buildings of all shapes and sizes over the years it has always been a source of irritation that most every photograph I have seen of tourist attractions of such buildings as the Notre Dame Cathedral most often look like the builder did not possess a level and a plumb line.
Professional Architectural photographers would use a view camera with movements to correct the distortion with a control called a rising front . If you are undertaking a lot of photographs of buildings you can help overcome the problem by moving further away from the subject so that the camera can remain in a horizontal position. If you are well healed you can invest in a special wide angle "Tilt / shift " lens that allows you to move the lens upwards in relation to the film plane.
You can achieve a similar effect in the computer (I can only vouch for this correction in Corel Paint Shop Pro, since it is the only program I own, Its called, would you believe "Perspective" control. And takes maybe 20 seconds to achieve.
The correction however somewhat distorts the image a little in other ways and chops a small amount off the edges of the photograph.
I took the liberty of correcting both images and you can see the images that resulted. Its a kind of result of compromise which distortion do you prefer! Bottom line, put up with the distortion, stand further away so you avoid tilting the camera, buy an ultra wide angle lens and crop out the subject from the center of the photograph, buy my Sinar (best route) or a wide angle lens with tilt/ shift facility!
You "pays yer money and makes your choice!
Ian
quote=Skswany I took this photo of Notre Dame Cat... (
show quote)
Right on Ian. Back in the day with the view canera we could contol all that with the front lens board. Tilt, Rase or lower & swing from side to side. Had a grid on back glass to help get everything strait and not distorted. Then they had the lens baby for the 35mm. Good but not as good as the view camera. Now you just shoot and fix on the computer. Cheers Hal
ygelman
Loc: new -- North of Poughkeepsie!
HarryBinNC wrote:
ygelman wrote:
The lens correction filter in Photoshop works fine if you know you're trying to correct a vertical edge. But a few weeks ago I tried correcting the Leaning Tower of Pisa -- and could not figure out how much to correct!
The original image (camera pointing up, of course) made the tower leaning IN, whereas it was actually leaning OUT. If I had been post processing on site it would been ok, but at home I could not get a clue since there was nothing vertical in the background near the tower.
Any ideas? Before and after images follow.
The lens correction filter in Photoshop works fine... (
show quote)
You can do a pretty good job of it in Photoshops Lens Correction -
The key is that before you apply the keystoning correction, you have to get the center of the image straight. Look at the brick buildings in the background - the buildings are tilted to the left at the image's vertical center line. Once you have rotated the image clockwise to get those buildings straight up and down at the centerline, Use the Vertical Perspective control in the Transform section (under the Custom Tab) to straighten up the verticals in the building on the left (I am assuming that that building wasn't leaning). Now the tower will lean to the right approximately as it should be without looking like it is actually falling over! I might have been a little too conservative when rotating the image initially, so the tower might really be leaning to the right a little more!
Harry
quote=ygelman The lens correction filter in Photo... (
show quote)
Harry, you're right! I didn't trust those small buildings in the back, and I went directly to Perspective Transform. Your suggestion to first rotate, then transform is a winner in my book. (And next time, I'll also take a reference shot with a level camera so I'll get the correct angle of lean.) Thank you.
Hal81
Loc: Bucks County, Pa.
HarryBinNC wrote:
ygelman wrote:
PrairieSeasons wrote:
. . . .
You didn't ask how to eliminate the effect, but one possibility is to use a tilt-shift lens and another is to use the lens correction filter in PhotoShop.
The lens correction filter in Photoshop works fine if you know you're trying to correct a vertical edge. But a few weeks ago I tried correcting the Leaning Tower of Pisa -- and could not figure out how much to correct!
The original image (camera pointing up, of course) made the tower leaning IN, whereas it was actually leaning OUT. If I had been post processing on site it would been ok, but at home I could not get a clue since there was nothing vertical in the background near the tower.
Any ideas? Before and after images follow.
quote=PrairieSeasons . . . . br You didn't ask h... (
show quote)
You can do a pretty good job of it in Photoshops Lens Correction -
The key is that before you apply the keystoning correction, you have to get the center of the image straight. Look at the brick buildings in the background - the buildings are tilted to the left at the image's vertical center line. Once you have rotated the image clockwise to get those buildings straight up and down at the centerline, Use the Vertical Perspective control in the Transform section (under the Custom Tab) to straighten up the verticals in the building on the left (I am assuming that that building wasn't leaning). Now the tower will lean to the right approximately as it should be without looking like it is actually falling over! I might have been a little too conservative when rotating the image initially, so the tower might really be leaning to the right a little more!
Harry
quote=ygelman quote=PrairieSeasons . . . . br Y... (
show quote)
Dont fix that one! That remines me of the motorcyle rider that got cold riding with the wind comming through between the buttons on his jacket. So he stopped and put it on backwards. A little ways down the road on a sharp turn he slipped on something and the bike went out from under him. He was knocked out. A passer by stopped to help and called for help. When the police arrived they ask the passer by how the rider was. He said he seemed ok till I turned his head around.
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