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#1 2007-01-17 15:06:04

jazzphil
New member
Registered: 2007-01-17
Posts: 2

Perspective control lenses

Is there any benefit / will the software handle images from perspective control lenses?

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#2 2007-01-21 11:13:57

GURL
Member
From: Grenoble
Registered: 2005-12-06
Posts: 3501

Re: Perspective control lenses

Your question could be divided into 3 different questions:
A - Are shift lenses useful for panos?
B - Are tilt lenses useful for panos?
C - What about using tilt+shift for panos?

A - (shift): I suspect that the answer is no but that the proof is very difficult to establish. A complete answer should be based on tests using several existing shift lenses and the comparison of image quality in resulting panoramas (not using shift v/s using shift.) As the definition of image quality varies from lens tester to lens tester and as the location of the NPP (no parallax point) in such a lens could be the subject of an academic study by itself, my advice would be:
- if you own a tilt lens, please make test and show us what you found
- if you don't own such a lens and you are not a very rich man, then don't buy one to shot panoramas because they are quite expensive.

B - (tilt): Tilt lenses are usually used to improve depth of field when the subject is quite flat and the camera don't face said subject (typical example: an adorned pavement, the bottom part of the image shows details of it next to the camera while the top image part shows it as a distant background. Another classical example: small flowers in a large meadow as the foreground, distant mounts in the background.) Here is an example of mine which was made while not using a tilt lens but only a poor man Coolpix digital camera plus PanoTools: http://www.panorama-numerique.com/w/web-enfin.jpg

C - (tilt+shift): big_smile mad lol roll
__________

BTW, here is a very long thread about shift & tilt lenses, Photoshop and stitchers (in French): http://www.photim.net/nci/discu.php3?co … 092807BIRD

In another thread of another forum someone suggested digital camera manufacturers should enable their "anti-shake" and sometimes "anti-dust" moving sensors to be used for perspective correction...

Last edited by GURL (2007-01-21 11:19:32)


Georges

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#3 2007-01-22 00:58:23

GURL
Member
From: Grenoble
Registered: 2005-12-06
Posts: 3501

Re: Perspective control lenses

Here is an image which would require a tilt lens if using a film camera. It was stitched by APP using 3 source image where the distance setting varied from (about) 2 feet to 12 feet. The resulting full size vertical pano is a 10 MP image.


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Last edited by GURL (2007-01-22 01:08:05)


Georges

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#4 2007-01-22 01:19:18

GURL
Member
From: Grenoble
Registered: 2005-12-06
Posts: 3501

Re: Perspective control lenses

Here is an other example where a part of a 360x180 spherical pano is extractred in the panorama editor and where the vanishing points are corrected like when using a shift lens:


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Georges

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#5 2007-01-24 17:59:36

jazzphil
New member
Registered: 2007-01-17
Posts: 2

Re: Perspective control lenses

Thanks for the information.


My search isn't so much for using a shift lens for panos, but rather using several images to produce a higher resolution image in a standard format ie. comparable to a 5x4 or a 120 film image.  I did all my formative photography 30 years ago on large and medium format when I worked as a professional photographer.  For 20 years I then worked in video.  I purchased a digital camera recently which is very good and comparable to 35mm film, but I'd really like to get more resolution without spending an enormous amount of money on a large digital back or a medium format digital camera.

I guess I'll experiment.

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